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Is there a site i can go to show how to change heater core on 1991 gmc 5.7 motor

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  • GMC Master
  • 16,194 Answers

Autozone.com make a free account, login, put in the year, make and model. Look at the free repair guides.

Posted on Dec 12, 2014

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6ya6ya
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Posted on Jan 02, 2017

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tripletauto
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SOURCE: 1996 GMC Sonoma heater core

the dash has to come out

Posted on Sep 11, 2008

  • 1 Answer

SOURCE: 1991 s10 heater core

HI, not to long age i replaced my heater core in my 1991 Chevy S-10. Its not as hard as you mite think it would be, but its no a walk in the park.. :) There are a few things you need to remove. First the glove box door, ash tray, the panel that surrounds the stereo and stereo, also the tray that holds the ash tray and last inside the glove box there is a small plastic panel at the back remove that and that should do it if I remember right. Ok now the fun part, be prepared to get your hands a little bite beat up, you are going to need a lot of extension for your wratches, some antifreeze and lots of pattions also about three hours. Injoy Blake.

Posted on Nov 29, 2008

  • 1118 Answers

SOURCE: heater core replacement

You do not have to do anything with the air conditioning, its all inside car under right side of dash. 1. go under hood and unhook heater hoses and bracket( if equiped) from core tubes. 2. go under dash right side remove 13mm bolt far right under dash thats so you can pull dash out a little ways to get cover off heater where heater core is.3. 1/4 in. socket set and 1/4 in. socket take screws out holding cover on look close there is one hidden top far right can't remember how maney 5 or 6 i think, screws all out use a little finess and remove cover and there will be your heater core. Good luck.

Posted on Apr 14, 2009

CMV9
  • 594 Answers

SOURCE: 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.

Posted on Apr 16, 2009

dnewcombe1
  • 1564 Answers

SOURCE: Replacing heater core in 2000 GMC sonoma. Dash is

If the dash is removed you've saved about 9 10ths of the job endurance. Look around, what you believe to be, the perimeter of the heater box. I cannot, and no one else can, tell you exactly where the bolts and nuts that mount the heater box are. Therefore you must viually sixe the box and check outide in the engine compartment and inside under the dash for the mounting bolts.You'll want to start by removing the heater hoses. Then starting at the passenger side engine compartment look for a group of 10mm or 7/16ths nuts retaining the housing and remove them. Do the same inside. The housing is usually held together with screws or clips, it changes year to year. Keep a log or pix of the wires and cables and hoses(vacuum) that are connected to the housing for reassembly. You'll need to "roll" the box out from under the dash depending on how much of the dash has been removed. The core is easy to spot for is has two hoses sticking out, and, is encircled with clips or screws . Also make sure you remove the bracket around the two entry hoses if it has one. Thank you, Dana

Posted on Oct 04, 2009

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1 Answer

How do I remove a heater core


it is ok to by pass the heater core but you will get no cabin heat in cold weather. find the 2 hoses that go into the heater core and join them together. Remember to check the coolant level at the radiator cap as you may get an air lock in the system

Nov 08, 2014 | 1991 GMC Sierra

1 Answer

How do i remove a heater core on a 5.7 liter motor


you left info for a 91 gmc sierra no such thing try again

Nov 08, 2014 | 1991 GMC Sierra

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Can a bad heater core cause your vehicle to overheat? I have a 1994 GMC Suburban


I WOULD SAY NO BECAUSE WATER ONLY CIRCULATES WHEN YOU TURN ON THE HEATER, BUT IF YOUR VEHICHLE CONTINUES TO OVERHEAT IT COULD BE 5 THINGS. CLOGGED RADIATOR,RADIATER HOSES.THERMOSTAT,RADIATER FAN SENSOR OR THE WATER PUMP

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How to replace heater core blower motor on a 2003 GMC Safari van


Dear James,

Try This. Go To YouTube And Type In "replace heater core blower 2003 GMC". You Might Get A Helpful Video Showing You One Being Replaced.

Hope This Helps.

Alex :o)

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1 Answer

2003 gmc sierra heat will not blow hot air. Changed thermostat, resistor, both heater core hoses are hot to touch and the coolant is full


if the blower motor motor is working then its a blocked heater core or a faulty shut off valve ,i would need to get my head under the bonnet and then the dash to find the fault to be honest

Nov 06, 2011 | 2003 GMC Sierra

1 Answer

How do you change the heater core in a 1991 GMC Jimmy 4X4


you will have to remove the dashboard for that one but the core is usualy in the center left of the a/c core! good luck!

Sep 08, 2009 | 1991 Chevrolet S-10 Blazer

2 Answers

GMC Sonoma SLE 4.3L 1991- Coolant Temp Gauge Not reading


there are 2 coolant sensors one for gauge and one for ecm

Jul 23, 2009 | 1991 GMC Sonoma

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Smoke coming in the vents when heater is turned on


sounds like heater core you will have to pull dash up and remove heater assembly to replace heater core it is a big job not for the faint of heart good luck

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