Question about GMC Jimmy

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Instruments not working

I installed a new heater core. After re-assembly, the instruments are not working. Tach, spedo, fuel, oil, temp and volts, all not working. All else seems OK. Dash lights, dimmer, self test when the ignition it turned on, etc all seem to be working. All fuses are OK. One fuse, labeled Crank, has no voltage on either side of it and that is not correct...need some guidance to troubleshoot this problem. Does anybody know this car well enough to talk me through diagnosis?

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  • GMC Master
  • 44,536 Answers

If your car worked well before the heater core replacement but doesn't after then it is logical to say that some where in the re-assembly of the system there is a connection that has not been fitted correctly or and earth wire that has been missed . Harnesses can be pulled or twisted in the process and it is so easy to dislodge a connection or put the wrong plugs together. Go back over what you did step by step to find the error.

Posted on Jan 03, 2014

  • gordon599 Jan 03, 2014

    I have had the cluster out three times now and have looked it over very carefully. I am obviously missing something but, The fact that there is no voltage on either side of the crank fuse should mean something to somebody with experience working on this car. The drawing shows the power for this fuse comes from the ignition switch. but with no voltage on either side of this I should be able to find a broken wire or connection problem or ?? in the yellow wire? from here it powers the inflatable restraint system, (air bags). The air bag light has been on for a couple of years but is now off. (since the heater core incident) so I am looking for a wire or connector, probably from the ignition switch to the fuse block. Since there is no voltage on the Crank fuse (fuse 20, 10Amp) it appears that it has to be the ignition switch or the yellow wire... My drawing does not show the instrument cluster so I get lost about here.. Maybe I have just talked myself into looking at only the yellow wire from the ignition switch and to try to trace that to a break or disconnect somewhere in that area... Please any comments or suggestions are appreciated...I am a pretty good troubleshooter but no experience at all with this problem. Thanks

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leetamara
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SOURCE: The gauges have stopped working ? Fuse under dash seems to be OK ?

Behind the dash is what they call a constant voltage regulator. It controls the guages. It's small and located behind the dash near speedo.

Posted on Jun 19, 2008

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SOURCE: 1989 Lincoln Town Car Heater core

Go to Autozone and purchase a Clymer repair manuel. It will show how to remove the dash. You need to find all the screws.

Posted on Nov 22, 2008

  • 1 Answer

SOURCE: 97 Jeep Wrangler Dash Gauges Arent Operating..everything else ok!

check fuse #17 in fuse box under hood. It's a 10 red fuse. that's how i fixed my problem.

Posted on Jan 07, 2009

  • 1348 Answers

SOURCE: Engine won't start. Dash lights flash rapidly when key turned.

the battery says 12 volts but may be dropping to 4 or 5 under a load...i would suggest jumpstarting the car and see what happens.the battery should read in the high 12 volts and not less than 9.5 under cranking. the dash lights go out on your car when starting,and the alarm will go off ,and disable the ignition if the voltage is too low in cranking the car because the computer will shut it down and activate the anti theft.....check your battery posts are tight. best of luck

Posted on Jul 22, 2009

  • 1 Answer

SOURCE: 97 Jeep Wrangler Dash Gauges Arent Operating..everything else ok!

I have a 98 Wrangler - same problem. Dash gauges would work, then out (airbag light came on). Then it would work for a week or two than out.
Tried looking at fuses, wires, aftermarket radio problems, etc.
When I pulled the instrument cluster out of the dash, I noticed a lot of goop (lubricant) on one of the cluster plugs. So I wiped it off with a paper towel and now everything works. Maybe too much goop was shorting stuff out? Anyway, I'll know in a couple of months if that was my problem or not assuming my gauges keep working uninterrupted.
ranger326

Posted on Aug 05, 2009

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1 Answer

How do i replace the heater core 1997 isuzu hombre


See me at website for images can only send one through this channel. www.autorepairhelp.us

Best Regards,

Master Tech Lee

HEATER BOX SHIELD
Image
Heater Box Heat Shield
Remove or Disconnect
1. Fasteners that retain heat shield to heater box assembly.
Image [ Heater Box Heat Shield
Install or Connect
1.Fasteners that retain heat shield to heater box assembly.
Tighten
-Bolts Screws to 2.2 N.m (25 lb in).
HEATER ASSEMBLY
Image ' Heater Hoses
Image ' A/C Evaporator Tube Assembly
Image ' Evaporator Core
Image ' Evaporator Core Assembly
Image ' Heater Assembly
Remove or Disconnect
1.Engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
2.Heater hoses. Refer to Heater Hoses.
3.Instrument panel. Refer to Instrument Panel Replacement in Interior Trim.
4.Air inlet assembly. Refer to Air Inlet Assembly Replacement.
5.Vacuum lines.
Important
-Clearly label vacuum line connections.
6.Heater assembly studs inside engine bay.
7.Blower motor resistor. Refer to Blower Motor Resistor.
8.Stud inside heater core housing.
-Stud is revealed by removing the blower motor resistor.
9.Rear case screws.
10.Heater assembly.
11.Seals.
Imagt
Imagt
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Heater Hoses
A/C Evaporator Tube Assembly
Evaporator Core
Evaporator Core Assembly
Heater Assembly
Install or Connect
1.Seals.
2.Heater assembly.
3.Rear case screws.
4.Stud inside heater core housing.
Tighten
-Stud to 1.9 N.m (17 lb in).
5.Blower motor resistor. Refer to Blower Motor Resistor.
6.Heater assembly studs inside engine bay.
Tighten
-Studs to 1.9 N.m (17 lb in).
7.Vacuum lines.
8.Air inlet assembly. Refer to Air Inlet Assembly Replacement.
9.Instrument panel. Refer to Instrument Panel Replacement in Interior Trim.
10.Heater hoses. Refer to Heater Hoses.
11.Engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
-Check the system for leaks.


Auto Repair Help US 699e5693-1e5b-4101-9428-b5c0b4e46f83.jpg

Sep 06, 2014 | 1997 Isuzu Hombre

1 Answer

Instruments not working on 1997 Jimmy, after replaceing the heater core


Check, you may have a connection to the cluster not fully plugged in. It's got to be at the cluster-the instrument panel.

Dec 24, 2013 | 2004 GMC Sierra 2500

1 Answer

How to remove heater core on a 1994 isuzu pickup


Removal & Installation

Fig. 1: When installing the new heater core take great care not to bend or damage the fins or tubing
[IMG]http://i665.photobucket.com/albums/vv17/technovative/Isuzu-Pickup-Heater-Core.gif[/IMG]
Click here if image doesn't display.
  1. Disconnect the negative battery cable.
  2. Drain the engine coolant into a suitable container. CAUTION
    When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
  3. Disconnect the heater hoses. Be careful not to damage the core by pulling on the hose to remove. Cut the hoses if they will not come off easily.
  4. Remove the instrument panel.
  5. Disconnect the resistor assembly.
  6. If possible, disconnect and move the duct (non air conditioning) or the evaporator housing (air conditioning) to the right to gain clearance for the heater unit. If equipped with air conditioning, do not disconnect air conditioning system until absolutely necessary. Refer to Section 1 for discharging, evacuating and recharging the system.
  7. Remove the instrument panel stay and heater unit.
  8. Disassemble the heater unit by removing the duct, mode control case, core assembly and heater core. To install:
  9. Assemble the heater unit by installing the duct, mode control case, core assembly and heater core.
  10. Install the heater unit and instrument panel stay.
  11. Connect the duct (non air conditioning) or the evaporator housing (air conditioning) to the heater unit. Evacuate and recharge the air conditioning system if the system was discharged to remove the evaporator assembly.
  12. Connect the resistor assembly.
  13. Install the instrument panel as outlined in this section.
  14. Connect the heater hoses. Be careful not to damage the core by pulling on the hose.
  15. Refill the engine coolant into a suitable container.
  16. Connect the negative battery cable and check for leaks.

Jan 30, 2011 | 1994 Isuzu Pickup

2 Answers

How do i fix the heater core on my ford taurus 1995


Hi there,

Remove heater/evaporator case. Remove vacuum source line from heater core tube seal. Remove seal from heater core tubes.
Remove heater core access cover screws. Remove access cover and seal from heater/evaporator case. Lift heater core and case seals out of heater/evaporator case.
Installation
If installing new heater core, transfer case seals to new core. Install heater core and seals into heater/evaporator case. Install heater core access cover on case. Install seal on heater core tubes. To complete installation, reverse removal procedure. Evacuate and charge A/C system. Refill cooling system.

HEATER/EVAPORATOR CASE
Removal
  • Disconnect negative battery cable. Drain coolant from radiator. Gently pull instrument panel away from right side of dash panel.
  • Discharge A/C system using approved refrigerant recovery/recycling equipment. Disconnect heater hoses from heater core. Plug heater core tubes or drain coolant by blowing coolant from heater core using low pressure compressed air. Disconnect vacuum supply hose from inside engine compartment.
  • Disconnect A/C lines from evaporator core. Plug A/C lines and evaporator core tubes. Remove instrument panel assembly brace to evaporator case bracket screw. Remove assembly brace.
  • Remove floor register and rear floor duct from bottom of heater/evaporator case. Remove nuts securing heater/evaporator case to firewall. Remove 2 screws securing support brackets to cowl top panel. Carefully pull heater/evaporator case away from firewall. Remove heater/evaporator case.
  • To install, reverse removal procedure. Evacuate and charge A/C system. Refill cooling system.
INSTRUMENT PANEL
Removal & Installation
  • Position front wheels in straight-ahead position. Disable air bag system. See AIR BAG RESTRAINT SYSTEM article in ACCESSORIES/SAFETY EQUIPMENT section. Disconnect negative battery cable. Remove steering column trim shrouds.
  • Disconnect all electrical connections from steering column switches. Remove cover from under steering column. Remove 4 bolts and reinforcement from under steering column. Disconnect parking brake release control motor from parking brake and ignition switch connector.
  • Disengage insulator retainer. Remove insulator. Remove 4 nuts and reinforcement below steering column. Remove 4 nuts securing steering column to instrument panel and lower column to front seat. Disconnect PRNDL cable (A/T models).
  • Ensure ignition switch is locked to prevent steering column from turning. Remove 4 instrument cluster retaining screws. Disconnect speed control cable and vehicle speed sensor (if equipped). Disconnect electrical connectors and remove instrument cluster. At steering column opening, remove one bolt securing instrument panel to brace. Remove one instrument panel brace bolt (below radio area).
  • Remove sound insulator under glove box by removing 2 push nuts securing insulator to studs on climate control case. Remove glove box door and compartment. Remove air cleaner housing, battery and battery tray. Disconnect wires of main wire loom in engine compartment. Disengage rubber grommet from firewall. Feed wiring into passenger compartment through hole in firewall.
  • Remove right and left kick panels. Disconnect wires from instrument panel at right and left kick panel sides. Remove screws on left and right sides of instrument panel.
  • Pull up to unsnap right and left speaker opening covers. Remove speaker covers. Working through steering column and glove box openings, reach under instrument panel and disconnect electrical connectors, vacuum hoses, A/C-heater control panel cables, and radio antenna cable.
  • Support instrument panel. Remove 3 screws attaching top of instrument panel to cowl top. Disconnect remaining wires. Remove instrument panel. To install instrument panel, reverse removal procedure.

Hope this helps...

Jan 17, 2011 | 1995 Ford Taurus

1 Answer

How to remove a heator core from a 2001 dodge caravan? do you have to take the dash out? or just the bottom pannel.


The 2001 Dodge caravan has 2 heater cores - front (the main one), and the rear. Removal of the
rear heater core is a whole different procedure than the front.

Front Heater Core - Removal and Installation
  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Align the wheels in the straight-ahead position.
  3. Disconnect the negative battery cable.
    CAUTION Before working around the steering wheel or the instrument panel all 2 minutes to pass to allow the air bag module to discharge.
  4. Drain the cooling system into a clean container for reuse.
  5. Remove the steering column, by removing or disconnect the following:

    Lower left side steering column cover Parking brake release cable from the parking brake lever 10 steering column cover liner-to-instrument panel bolts and the cover liner
  6. Rotate the key to the LOCK position; then, rotate the steering wheel to the LOCKED position.

    Gear selector cable and its mounting bracket as an assembly from the upper steering column mounting bracket 2 instrument cluster trim bezel-to-instrument panel screws, retaining clips and bezel 2 steering column shroud-to-steering column screws and the shroud Steering column-to-intermediate steering shaft coupler
  7. Loosen but do not remove the 2 lower steering column mounting bracket nuts/washers.

    2 upper steering column mounting bracket nuts/washers Steering column assembly from the vehicle
  8. Remove or disconnect the following:

    Instrument panel-to-chassis harness interconnect and bracket Lower silencer boot, at the base of the steering shaft
  9. Working in the engine compartment, pinch off the heater hoses.

    Heater core cover. Position some towels under the heater core hoses. Heater core plate and the hoses
  10. Depress the heater core retaining clips.
  11. Lift the accelerator pedal and slide the heater core past it.
  12. Depress the brake pedal and remove the heater core from the heater/air conditioning housing assembly.

    0996b43f8022fa83.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. View of the steering column assembly


    0996b43f8022fa84.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. View of the interconnect and bracket


    0996b43f8022fa85.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. View of the front heater core assembly


To install:
  1. Depress the brake pedal and install the heater core into the heater/air conditioning housing assembly.
  2. Lift the accelerator pedal and slide the heater core past it.
  3. Install or connect the following:

    Heater hoses (using new O-rings) and the heater core plate Heater core cover Heater hoses clamps, working in the engine compartment Lower silencer boot at the base of the steering shaft Instrument panel-to-chassis harness interconnect and bracket
  4. Install the steering column assembly by installing or connect the following:

    Steering column assembly, carefully into the vehicle. 2 upper and 2 lower steering column mounting bracket nuts/washers. Torque the nuts to 105 inch lbs. (12 Nm). Steering column-to-intermediate steering shaft coupler and tighten the pinch bolt to 21 ft. lbs. (28 Nm) 2 steering column shroud and the shroud-to-steering column screws Bezel, the retaining clips and the 2 instrument cluster trim bezel-to-instrument panel screws Gear selector cable and its mounting bracket as an assembly to the upper steering column mounting bracket 10 steering column cover liner and the cover liner-to-instrument panel bolts Parking brake release cable to the parking brake lever Lower left side steering column cover. Lower left side steering column cover
  5. Refill the cooling system.
  6. Connect the negative battery cable.
  7. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

Jan 02, 2011 | 2001 Dodge Caravan

1 Answer

Trying to replace heater core 1994 s10 4 cyl


GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide



Heater Core - REMOVAL & INSTALLATION
1994-97 Vehicles
(see Figure 1)

44d2ba8.jpg

Fig. 1: Exploded view of a common heater core and case assembly
  1. Disconnect the negative battery cable and properly drain the engine cooling system to a level below the heater core.
  2. Disconnect the heater hoses from the core tubes near the cowl.
The instrument panel carrier is designed not only to provide access to parts through removal of the carrier components, but the carrier will also tilt downward as a complete assembly to allow access from the top. If this is desired, remove the retainer screws along the top and bottom of the carrier assembly (refer to the figure). The instrument panel will then tilt as an assembly into the cab. It is necessary to unbolt and lower the steering column from the carrier to allow for maximum movement of the instrument panel.
  1. The instrument panel must be removed or repositioned for access to the heater core case. Unbolt and either tilt the instrument panel forward or disengage the instrument panel components and remove the panel from the vehicle. In most cases, tilting the panel forward should be sufficient for the necessary access.
  2. Unfasten the heater core rear case retaining screws, then remove the rear case for access to the heater core.
  3. Loosen the retainers and remove the heater core retaining straps.
  4. Remove the heater core and seals.
To install:
  1. Install the heater core and seals, taking care not to damage the core tubes when inserting them through the cowl.
  2. Install and secure the core retaining straps.
  3. Install the rear case and secure using the screws.
  4. Reposition and secure the instrument panel and components. Tighten the cowl screws to 17 inch lbs. (1.9 Nm) and the lower instrument panel screws to 66 inch lbs. (7.5 Nm).
  5. Connect the heater hoses to the core tubes.
  6. Connect the negative battery cable, then properly refill the engine cooling system.
  7. Run the engine at normal operating temperature, then check for leaks.

Good luck (remember rated this post).

May 19, 2010 | 1994 Chevrolet S-10

1 Answer

REPLACING HEATER CORE


HEATER CORE REPLACEMENT REMOVAL PROCEDURE 1. Remove the fuel injector sight shield. 2. Drain the cooling system. Refer to Draining and Filling Cooling System in Cooling System. 3. Use J 38185 in order to position aside the heater hose inlet and outlet clamps at the heater core. 4. Disconnect the inlet and outlet heater hose from the heater core. 5. Remove the RH Instrument Panel Closeout/Insulator panel. 6. Remove the LH Instrument Panel Closeout/Insulator panel 7. Remove the floor carpet. 8. Remove the rear floor air outlet duct from the holes in the floor reinforcement. 9. Disconnect the rear floor air outlet duct from the heater air outlet cover. 10. Remove the rear floor air outlet duct. 11. Remove the heater air outlet cover screws . 12. Remove the heater air outlet cover heat stakes with a small chisel. 13. Remove the heater air outlet cover from the HVAC module assembly. 14. Remove the heater core cover screws . 15. Remove the heater core cover heat stakes with a small chisel. 16. Remove the heater core cover from the HVAC module assembly. 17. Remove the heater core from the HVAC module assembly. 18. Remove the heater core foam seal (1) from the HVAC module assembly.
INSTALLATION PROCEDURE 1. Install a new heater core foam seal to the HVAC module assembly. 2. Install the heater core to the HVAC module assembly. 3. From the inside of the heater core cover, drill the dimples adjacent to the heat stakes using a 5.5 mm (7/32 in) drill bit. 4. Install the heater core cover to the HVAC module assembly. NOTE: Refer to Fastener Notice in Service Precautions. 5. Install the heater core cover screws . Tighten Tighten all screws to 1.5 N.m (13 lb in) . 6. From the inside of the heater air outlet cover, drill the dimples adjacent to the heat stakes using a 5.5 mm (7/32 in) drill bit. 7. Install the heater air outlet cover. 8. Install the heater air outlet cover screws (2). Tighten Tighten the screws to 1.5 N.m (13 lb in) . 9. Connect the rear floor air outlet duct to the heater air outlet cover. 10. Install the rear floor air outlet duct to the holes in the floor reinforcement. 11. Install the floor carpet. 12. Install the RH Instrument Panel Closeout/Insulator panel. 13. Install the LH Instrument Panel Closeout/Insulator panel. 14. Connect the inlet and outlet heater hose to the heater core. 15. Use J 38185 in order to reposition the heater hose inlet and outlet clamps to the heater core. 16. Install the fuel injector sight shield. 17. Fill the cooling system.

Nov 13, 2009 | 2003 Chevrolet Monte Carlo

1 Answer

Changing a heater core


here is a step by step diagram to replace your heater core
Front
  1. Disconnect the negative battery cable.
  2. Drain the cooling system.
  3. Remove the instrument panel glove compartment.
  4. Tag and unplug all electrical leads as necessary.
  5. Remove the center air distribution duct from the floor.
  6. If necessary, remove the ECM and mounting tray.
  7. Remove the hinge pillar trim panels.
  8. Remove the blower motor cover and then remove the motor.
  9. Remove the steering wheel and tilt back the instrument panel slightly.
  10. Remove the coolant overflow tank. Disengage the heater hoses at the core connections.
  11. Unfasten the attaching screws and nut and then remove the heater case.
  12. Remove the seven screws and lift off the heater case cover.
  13. Remove the fasteners and brackets that hold the heater core to the case and lift the core from the case.
To install:
  1. Install the heater core in the case.
  2. Install the heater case bottom plate. Make sure there is a good seal.
  3. Install the heater case into the truck. Tighten the 4 lower screws to 17 inch lbs. (2 Nm); the upper screw to 97 inch lbs. (11 Nm); and the nuts to 25 inch lbs. (2.8 Nm).
  4. Connect the heater hoses at the core tubes.
  5. Install the coolant overflow tank.
  6. Install the instrument panel and the steering wheel.
  7. Install the blower motor and cover.
  8. Install the trim panels and if removed, the ECM. Install the air distribution duct and reconnect all electrical leads.
  9. Install the glove compartment. Fill the cooling system and connect the battery cable.
  1. Disconnect the negative battery cable.
  2. Drain the engine cooling system into a clean container for reuse.
  3. Disconnect the heater hoses from the heater core.
  4. Remove the instrument panel storage compartment.
  5. Disconnect the electrical connectors, as necessary, that may be in the way.
  6. Remove the center floor air distribution duct.
  7. Remove the hinge pillar trim kick panels.
  8. Remove the blower motor cover screws and the cover.
  9. Remove the blower motor screws and the blower motor.
  10. Remove the steering wheel and the steering column (standard & tilt).
  11. Remove the instrument panel fasteners and pull the instrument panel back far enough to gain access to the heater assembly.
  12. While holding the heater assembly against the firewall, remove the screw located on the interior side near the evaporator pipe, if equipped.
  13. In the engine compartment, remove the 4 heater assembly-to-chassis screws and the 2 heater assembly-to-chassis nuts.

    NOTE Removal of the heater assembly may require the help of an assistant.
  14. Remove the 7 heater cover-to-heater assembly screws and the cover.
  15. Remove the heater core from the heater assembly.
    93113g80.gif View of the front heater assembly—Chevy/GMC C/K-Series, Blazer, Jimmy, Sierra, Suburban, Tahoe, Yukon
    Click to Enlarge
    93113g81.gif Location of the front heater assembly-to-chassis fasteners—Chevy/GMC C/K-Series, Blazer, Jimmy, Sierra, Suburban, Tahoe, Yukon
    Click to Enlarge
To install:
  1. Install the heater core to the heater assembly.
  2. Install the heater cover and the 7 heater cover-to-heater assembly screws.

    NOTE Installation of the heater assembly may require the help of an assistant.
  3. In the engine compartment, install the 4 heater assembly-to-chassis screws and the 2 heater assembly-to-chassis nuts. Torque the screws to 17 inch lbs. (1.9 Nm) and the nuts to 25 inch lbs. (2.8 Nm).
  4. While holding the heater assembly against the firewall, install the screw located on the interior side near the evaporator pipe, if equipped. Torque the screw to 97 inch lbs. (11 Nm).
  5. Install the instrument panel and the instrument panel fasteners.
  6. Install the steering column (standard & tilt) and the steering wheel.
  7. Install the blower motor and the blower motor screws.
  8. Install the blower motor the cover and the cover screws.
  9. Install the hinge pillar trim kick panels.
  10. Install the center floor air distribution duct.
  11. Connect the electrical connectors that were disconnected.
  12. Install the instrument panel storage compartment.
  13. Disconnect the heater hoses to the heater core.
  14. Refill the engine cooling system.
  15. Connect the negative battery cable.
  16. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

Dec 31, 2008 | 1994 Chevrolet C1500

1 Answer

Gauges not working


Ur instrument cluster is most probably the culprit. Smack the dashboard to see if it helps. If it does, bingo, most probably a bad weld on the cluster circuit board. Happens alot on VW's.

Oct 21, 2008 | 1996 Volkswagen Jetta

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