Question about 1999 Dodge Dakota

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Heater air only blows out of defroster. Found two vacuum hoses disconnected under dash. Where do they plug in?

Hoses are connected to controller. they are gray with black plastic ends.

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  • Dodge Master
  • 5,371 Answers

Look for the little silver canisters that control heater doors. Vacuum lines must have come off them. Reconnect and see if normal operation returns. If not you may need to switch them around. The contours and bends in the vacuum line may give you a clue to how and where they are routed, since those two are not color coded.

Posted on Jan 16, 2013


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Posted on Jan 02, 2017

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SOURCE: 2001 dodge ram 1500 4x4 vent hose on rear axel

The hose is only an extension to elevate the vent. Trucks have these so they can be braver about crossing axle deep water.. The plastic piece on the end is somewhat of a chk valve so the hose isn't open to dirt and road spray.It should be cliped to the frame to stay elevated.

Posted on Jun 08, 2009

  • 7 Answers

SOURCE: when i have the heater/defroster on the heater

It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.

Posted on Sep 05, 2009

  • 1 Answer

SOURCE: air only blows on defrost (windshield)

Check vacuum lines on firewall for leak, check all vacuum lines if one on fire wall is ok , doors work off vacuum

Posted on Oct 14, 2009

  • 6674 Answers

SOURCE: I need a diagram for the A/C and heater vacuum

It may not be that hard without diagram. You'll have one main feed line in (suction), then it gets distributed via control. If you start engine, with feed line connected to proper port (inlet, and probably larger than the rest) then switch to different modes, you should have vacuum at one of the other ports, and simply attach one line at a time, turn on fan, until you find the one that directs air to where it should be going. Then go on to next setting, and try remaining lines one at a time, on port where you hear hissing/feel vacuum until blower blows where it says it should. If you still need diagram, let me know, I'll do some digging.

Posted on Nov 01, 2009

  • 55 Answers

SOURCE: where do the vacuum hoses go from the control 1999 Dodge Pickup

first ... Make sure that you have vacuum to your control head. This is normally the black vacuum line. The vacuum than goes to the various vacuum motors on the Heater /AC case. These vacuum motors rarely fail. The normal fault is loss of engine vacuum ..cut line or not secure to engine. second.. a fault with the vacuum reserve reseviour. When the engine needs the vacuum this is your vacuum supply.

Posted on Apr 29, 2010

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Do i have to remove complete dash to replace a heater core in 1992 grand marquis.

Section 12-03: Air Conditioning System 1992 Town Car/Crown Victoria/Grand Marquis Workshop Manual REMOVAL AND INSTALLATION Plenum Removal
  1. Disconnect battery ground cable.
  1. Disconnect the heater hoses from the heater core tubes. Plug the ends of the heater hoses to prevent coolant loss.
  1. Plug heater core tubes securely to prevent coolant leakage from heater core during plenum removal.
  1. Remove three nuts located below the windshield wiper motor retaining the LH end of the plenum to the dash panel (Fig. 15).

FIG. 15 Plenum and Air Inlet Duct Removal


  1. Remove one nut retaining the upper LH corner of the evaporator case to the dash panel.
  1. Remove LH and RH lower instrument panel insulators.
  1. Disconnect two vacuum supply hoses from vacuum source. Push grommet and vacuum supply hose into passenger compartment.
  1. Remove all instrument panel retaining screws and pull the instrument panel back as far as possible without disconnecting any wire harnesses.
  1. Loosen the RH door sill plate and remove the RH side cowl trim panel.
  1. On manual systems, disengage the temperature control cable housing from the bracket on top of the plenum. Disconnect the cable from the temperature blend door crank arm. On ATC systems, remove cross body brace and disconnect wiring harness from temperature blend door actuator and disconnect the ATC sensor tube from the evaporator case connector.
  1. Disconnect the vacuum jumper harness at the multiple vacuum connector near the floor air distribution duct.
  1. Disconnect the white vacuum hose from the outside-recirculating door vacuum motor.
  1. Remove two hush panels.
  1. Remove one plastic push fastener retaining the floor air distribution duct to the LH end of the plenum. Remove LH screw and loosen RH screw on the rear face of the plenum (Fig. 14), and remove the floor air distribution duct.
  1. Remove two nuts from the two studs along the lower flange of the plenum.
  1. Carefully move plenum rearward to allow heater core tubes and the stud at the top of the plenum to clear holes in the dash panel. Remove plenum from vehicle by rotating the top of the plenum forward, down and out from under the instrument panel. Carefully pull lower edge of instrument panel rearward as necessary while rolling the plenum from behind the instrument panel.
  1. Route the vacuum supply hose through the dash panel and seat the grommet in the opening.
  1. Position the plenum under the instrument panel with the register duct opening up and the heater core tubes down. Rotate the plenum up behind the instrument panel and position the plenum to the dash panel. Insert the heater core tubes and mounting studs through their respective holes in the dash panel and the evaporator case.
  1. Install three nuts on the studs along the lower flange and one on the upper flange of the plenum (Fig. 15).
  1. Install three nuts below the windshield wiper motor to attach the LH end of the plenum to the dash panel.
  1. Install one nut to retain the upper LH corner of the evaporator case to the dash panel.
  1. Position floor air distribution duct on plenum. Install two screws and plastic push fastener.
  1. If removed, position panel door vacuum motor to the mounting bracket. Install two retaining screws.
  1. Connect the white vacuum hose to the outside-recirculating door vacuum motor.
  1. Connect the vacuum jumper harness to the plenum harness at the multiple vacuum connector near the floor air distribution duct. Install floor duct.
  1. Connect the ATC sensor tube to the evaporator case connector on ATC equipped vehicles.
  1. Install the cross body brace and connect wiring harness to the blend door actuator on ATC equipped vehicles.
  1. Connect the temperature control cable housing to the bracket on top of the plenum and connect the temperature control cable to the temperature blend door crank arm. Adjust the temperature cable as outlined under Adjustments.
  1. Install the bolt to attach the lower RH end of the instrument panel to the side cowl.
  1. Install the RH side cowl trim panel and tighten the RH door sill plate retaining screws.
  1. Install glove compartment door and check arms.
  1. Connect vacuum supply hose to vacuum supply.
  1. Install RH and LH lower instrument panel insulators.
  1. Install two hush panels.
  1. Unplug the heater core tubes and connect the heater hoses to the heater core tubes.
  1. Fill the cooling system with coolant to replace coolant lost during removal of the plenum.
  1. Connect the battery ground cable. Check the system for proper operation.

Dec 17, 2010 | 1992 Mercury Grand Marquis

1 Answer

Heater air will only come out at windshield

your a/c controls in this vehicle are vacuum operated. you more than likely have a vacuum leak that can be under the hood or under the dash. take a look under the hood and inspect all of the vacuum hoses, mainly the small colored hard plastic hoses. if your car also runs poorly that means you may have a leak in your engine vacuum, check larger black vacuum hoses and rubber seal on brake booster that manifold vacuum hose goes to. if no leak found under hood check those colored hard plastic hoses. with any luck you'll have heat blowing throuh your vents in no time.

Dec 16, 2010 | 1996 Ford Mustang

1 Answer

My heat want get hot but it blows

For one reason or another your heater core is not recieving any circulation. It could be a frozen heater switch valve or ( diverter valve ). That is located in line under the hood on one of the heater hoses running into the firewall. Check it for operation. If that is okay check for plug in heater hose or a pinched condition of supply lines. If the blower blows but you dont feel any air movement then the
air control gates under the dash arent working. They are vacuum controlled and hoses get old and crack and break or pulled so check all the vacuum elements on the climate control center under the dash. If you feel air but not from the vents then a length of duct work came disconnected or it cracked somewhere.

Nov 18, 2010 | 1988 Lincoln Town Car

1 Answer

My heater is blowing cold air, and it wont blow hot air even if the engine is running hot... on vent it blows hot air like it should for half a second then it blows cold again, it wont blow hot air out the...

OK, a vacuum controlled blend door is the problem.


See Figure 1

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Fig. Fig. 1: Plenum door vacuum motors

  1. Disconnect the vacuum hose at the motor.
  2. Remove the 2 motor attaching screws.
  3. Rotate the assembly so that the slot in the bracket is parallel to the tee-shaped end of the door crank arm, and pull the motor and bracket off the crank arm.
  4. Installation is the reverse of removal.
--- Search for other vacuum motors under the dash to see if the vacuum hoses have somehow deteriorated or become detached. --- Try to look up your vehicle on for other vacuum motors under the 'heater' section of the 'chassis electrical' section of the 'repair guide' after selecting your 1996 Ford f250 crew cab vehicle.

Oct 29, 2010 | 1996 Ford F250 Crew Cab

1 Answer

How to replace heater mcore in 1988 crown vic

Instructions Things You'll Need:
  • Wrench
  • Container
  • 3/8-inch hose
  • Rubber plugs
  • Screwdriver
  • Water
  • Engine coolant
    Removal - Exterior
  1. 1

    Disconnect the car's negative battery cable.

  2. 2

    Open the coolant tank cap in the engine, then place a large container under the radiator's lower corner. Stick a 3/8-inch diameter hose on the drain fitting in the corner, and loosen the fitting with a wrench to drain the coolant. Repeat for the engine block drain plugs.

  3. 3

    Squeeze the hose clamps on the heater core tubes ad slide them off, then disconnect the tubes and plug them with rubber.

  4. 4

    Unscrew and remove the three nuts below the windshield wiper's motor on the firewall with your wrench, followed by the one nut on the evaporator case's upper left corner.

  5. 5

    Disconnect the vacuum hoses from the car's vacuum source, then push the supply hose and its grommet into the passenger compartment.

  6. Removal - Interior
  7. 1

    Remove the instrument panel trim moldings, the left and right instrument panel insulators, the steering column covers, the door sill plates and the defroster grille. Use a screwdriver on the screws, and pry off the panels with a trim stick where needed.

  8. 2

    Disconnect the shift indicator cable from within the steering column, then remove the reinforcement brace from underneath the column. With the front wheels pointing forward, remove the steering column's retaining nuts with a wrench, and lower the column.

  9. 3

    Open the glove compartment and lower it by depressing the tabs.

  10. 4

    Remove all the retaining bolts for the instrument panel with your wrench; these will be behind the removed trim panels and within the defroster ducts and glove compartment.

  11. 5

    Pull the instrument panel back as far as you can without disconnecting the wires behind it.

  12. 6

    Remove the cross-body brace. Disconnect the temperature blend door actuator's wiring harness, followed by the temperature control sensor tube at the evaporator case connector.

  13. 7

    Disconnect the jumper harness at the vacuum connector near the floor air duct, followed by the vacuum hose at the outside-recirculating door vacuum motor. Remove the plastic push fastener and the left screw for the air duct, loosen the right screw with the screwdriver and remove the air duct.

  14. 8

    Unscrew the two nuts along the plenum's lower edge with a wrench, then move the plenum rearward until the heater tubes and the top stud clear the holes in the dash panel.

  15. 9

    Rotate the plenum's top end forward, down and out of the instrument panel, then pull the panel's lower edge to the rear while you roll the plenum out from behind the panel.

  16. 10

    Unscrew and remove the heater core cover using a screwdriver, then pull the heater core and its seal out of the plenum assembly.

  17. Installation
  18. 1

    Install the new heater core with its seal into the plenum assembly, then close and screw the heater core cover in place.

  19. 2

    Route the vacuum supply hose back through the dash panel, and seat its grommet within the opening.

  20. 3

    Place the plenum under the instrument panel with its register duct open and its heater tubes pointing downward. Rotate the plenum upward and behind the instrument panel, then position it to the dash panel.

  21. 4

    Connect the heater core tubes and their mounting studs through their holes in the dash panel and the evaporator case.

  22. 5

    Re-install the air duct, then connect and tighten all its mounting nuts and screws using your wrench and screwdriver.

  23. 6

    Reconnect all wiring harnesses, tubes and hoses to the vacuum motor, the air distribution duct and the temperature control system, then reconnect the cross-body brace.

  24. 7

    Connect the instrument panel in place followed by all the dash trim panels in the reverse order of removal.

  25. 8

    Reconnect all hoses, nuts and tubes in the engine compartment--this includes the plenum's nuts on the firewall, the vacuum supply hoses to the vacuum source and the heater core tubes.

  26. 9

    Refill the cooling system with fresh coolant--half water and half antifreeze--at the radiator filler neck.

Oct 25, 2010 | 1988 Ford Crown Victoria

1 Answer

Air stopped blowing through vents, only blows through defroster

Make sure all your vacuum hoses are connected on the engine side. There is a vacuum ball mounted close to or on the fender wall. Make sure that the hose is connected to the vacuum ball. Question: Has the engine started to run rough lately? And do you hear a hissing sound or whistle from the dash area?

Aug 10, 2009 | 1998 Jeep Grand Cherokee

4 Answers

Climate controls

Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.

May 21, 2009 | 1997 Lincoln Continental

1 Answer

No heat

if the heater hoses are hot on both sides(indicating the engine is at full temp) and you feel the heat controller in dash is working properly, i would suggest disconnecting both heater hoses and backflush heater core with decent amount of pressure. if this improves condition but does not solve completely, heater core replacement is necessary.

Nov 15, 2008 | 2001 Mercury Grand Marquis

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