Question about 1990 Pontiac Trans Sport

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Heater will not operate - 1990 Pontiac Trans Sport

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Check your heater core, and the coolant lines going in and out of your firewall located on the passenger side somewhere neer the EGR canister. but you have a van, and thats a very cramped space. good luck

Posted on Oct 04, 2010

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No heate in my 1992 Plymouth voyager , remove radiator cap water not moving Not sure why ! Please help


Hard to see coolant circulating through the cap opening. If the engine is not overheating, the coolant is circulating.
To check the heater, first feel both heater hoses at the firewall where the hoses go inside. Both should be hot! If one is hot and one is cool, then the heater core is not circulating, and that is why you have no heat. If both are hot (with engine at normal operating temperature), then the heater core is okay, and the problem may be the heater case doors not operating properly. This is called the temperature blend door problem-common on lots of cars-and caused by either vacuum operated doors or by motor operated doors in the heater case not operating properly. Sometimes the doors break, sometimes the vacuum signal is lost due to leaking vacuum hoses, or the servo canisters not working.
In short, if the heater core is hot (if both heater hoses are hot), and the coolant level is not low, then the problem is probably the heater case. check if the doors in the case are working.

Nov 07, 2016 | 1992 Plymouth Voyager

1 Answer

My 2005 GMC C7500 heater is not blowing hot air. The fan is working fine, but it seems we can'[t get it to switch to heat. We replaced the in dahs switch assembly thinking the switch just wasn't...


It is probably the blend doors in the heater case not opening correctly. They are probably vacuum operated doors.


Check the heater core by feeling both heater hoses (the inlet and outlet) when the engine is at normal operating temperature. Both hoses should feel hot, meaning the heater core is circulating coolant correctly. If only one hose feels hot, the heater core may be plugged up, or it may have an air block.

If the heater core checks out good, check the heater case doors for proper movement when you switch from cold to heat. Several vacuum lines branch out from back of the control unit to vacuum canisters on the case, which open or close the various doors. These doors used to be only cable operated, but most are now vacuum operated. There should be a single vacuum hose from the engine, into the firewall, and then to the heater control unit in the dash, where hoses distribute the vacuum signal to various doors or vents as demanded by the switch settings.

Oct 24, 2014 | Cars & Trucks

1 Answer

Heat is not coming inside the car when heater is put on


- Ensure that the temperature gauge stays at the middle at operating temperature.
- Check the heater control valve operation, control cable and thermostat.
- Check the heater pipes routing.
- Check the heater radiator for clogged.

Mar 05, 2014 | 1994 Toyota Corolla

1 Answer

Hello My heat stopped working on my 98 milenia. I replaced the thermostat and flushed the heater core. Still no heat. Someone told me about the heater box. Looked for it under dash by taking out glove box...


Does the blower motor still work?
Lift the hood after the engine is at normal operating temperature, and feel the two heater hoses going from the engine into the firewall. Both should be hot if the coolant is circulating through the heater core. If they are, one of the inner doors in the heater box may not be operating. The doors are either cable operated or vacuum operated from your heater controls. One door in the box should be open when heat is desired to let the blower fan blow air across the heater core, and then to the vents where heat comes out. The heater box is usually rather large, under the middle of the dash. Have someone check your temperature blend door- I believe that is the one that may be at fault.
Now if only one of the heater hoses is hot, and the other is cool, the coolant is not circulating through the core. Look for an in-line water valve on one of the hoses. These also may be cable or vacuum operated from the heater control head. Not all vehicles have a valve, just some do.

Oct 17, 2013 | Cars & Trucks

1 Answer

I have a 2000 jeep wrangler when I turn on the heat or defrost I can hear it running but I get no heat. What could cause this heater coil, thermastat or something else maybe?


Is coolant level full? To check if the heater core is circulating coolant, feel both heater hoses where they enter the firewall-both should be hot when car is at normal operating temperature. If only one is hot, look for a heater valve in the heater line-make sure it is open so the heater core circulates. Not all vehicles have such a valve, in fact, I think most don't have the valve, but you could check. The valve may be cable operated or vacuum operated to open and close. If no valve, and one hose is cold, there may be an air block in the heater core. Crack a line loose to get coolant circulating.
If both hoses are hot, it is probably the doors in the heater case not operating properly. Watch the door actuators when you move heat from cold to hot, and when moving from defrost to another setting. The temperature blend door is probably on the passenger side of heater case. These doors may be cable operated, vacuum operated, or electrical motor operated. If you watch for their operation, you might see or hear the problem with them not opening or closing properly.
Good luck.
If both heater hoses are hot

Jan 01, 2013 | Cars & Trucks

1 Answer

1998 mercury grand marquis heater doesnt work only cold air comes out the air cond works fine the enginecoolant is new, the engine doesnt overheat.


Either your heater control valve is not properly operating or your heater core is clogged. Locate the heater control valve under the hood, should be close to firewall on heater hose, have someone adjust temperature from hot to cold and see if you can see the heater control valve operating if so replace the heater core, if its not doing anything replace it(heater control valve).

Feb 19, 2011 | 1998 Mercury Grand Marquis

1 Answer

2006 grand prix heater only blows cold air. both heater hoses are hot blower motor works fine.


Sounds like the temperature blend door actuator may be bad or the vacuum hose to it is disconnected.

Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.
  1. Start the engine.
  2. Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
  3. Set the mode selector to FLOOR mode.
  4. Set the heater control selector to the warmest temperature setting.
  5. Set the blower speed the lowest setting.
  6. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
  7. Set the mode selector to PANEL mode.
  8. Select the maximum blower speed.
  9. Select the warmest temperature setting.
  10. Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
  11. Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
  12. Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
  13. Inspect the temperature door operation. Repair any problems found, go to step 17.
  14. Turn OFF the engine. Back-flush the heater core. Start the engine. Select the FLOOR mode and the lowest blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Is the inlet heater hose feel significantly hotter than the outlet heater hose? If yes, go to the next step. If no, go to step 17.
  15. Replace the heater core. When the repair is completed, go to step 17.
  16. Check for low engine temperature problems, Repair or replace as needed, go to step 17.
  17. Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.

Nov 19, 2010 | 2006 Pontiac Grand Prix

1 Answer

The heater a/c or defroster will not work in my car no air will blow through the vents


Is the fan turning (do you hear it)? If it's blowing, but not passing the blend door, then that would describe why it doesn't deliver air to the passenger compartment.

Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.
  1. Start the engine.
  2. Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
  3. Set the mode selector to FLOOR mode.
  4. Set the heater control selector to the warmest temperature setting.
  5. Set the blower speed the lowest setting.
  6. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
  7. Set the mode selector to PANEL mode.
  8. Select the maximum blower speed.
  9. Select the warmest temperature setting.
  10. Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
  11. Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
  12. Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
  13. Inspect the temperature door operation. Repair any problems found, go to step 17.
  14. Turn OFF the engine. Back-flush the heater core. Start the engine. Select the FLOOR mode and the lowest blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Is the inlet heater hose feel significantly hotter than the outlet heater hose? If yes, go to the next step. If no, go to step 17.
  15. Replace the heater core. When the repair is completed, go to step 17.
  16. Check for low engine temperature problems, Repair or replace as needed, go to step 17.
  17. Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.
Insufficient Defrosting CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.
  1. Start the engine, select the DEFROST mode, and select the maximum blower speed. Does sufficient air flow from the defroster outlets? If yes, go to the next step. If there is insufficient airflow, go to step 9.
  2. Measure the engine operating temperature. Does the engine reach normal operating temperature (approx. 200° F)? If yes, go to the next step. If the engine does not reach normal operating temperature, go to step 7.
  3. Select the minimum blower speed. Select the warmest temperature setting. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 10. If the hose temperature feels approx. the same, go to the next step.
  4. Test the operation of the A/C compressor clutch. Does the A/C compressor clutch engage? If yes, go to step 6. If the compressor clutch does not engage, go to step 5.
  5. Inspect A/C compressor clutch and controls. Repair or replace as needed, go to step 13.
  6. Determine if the A/C system is operating within specifications. If yes, go to step 8. If no, go to step 11.
  7. Check the low engine temperature problem. Repair any problems found, go to step 13.
  8. Inspect for correct operation of the recirculation door. If the door is operating correctly, go to step 13. If the door is not operating properly, go to step 12.
  9. Check air delivery system. Repair any problems found, go to step 13.
  10. Check the heater core for blockage. Repair or replace as needed, go to step 13.
  11. Check A/C performance. Repair or replace as needed, go to step 13.
  12. Repair the recirculation door concern. When the repair is complete, go to step 13.
  13. Operate the system in order to verify the repair. If the system is operating properly, the procedure is complete. If the system is still not providing proper defrosting, repeat the entire test.
Noise from Blower Motor
  1. Inspect the air inlet grille for debris. If the grille has debris, go to step 7. If the grille is clear, go to the next step.
  2. From inside the vehicle, close all vehicle doors and windows, turn ON the ignition, with the engine OFF, and cycle the blower motor through all speeds in order to determine where and when the noise occurs. If noise is heard during the blower operation, go to step 3. If there is no noise, go to step 10.
  3. Inspect for excessive vibration at each blower motor speed by feeling the blower case. If there is vibration, go to step 5. If no vibration is present, go to the next step.
  4. Listen to the blower motor at each blower speed. Is the blower motor making a squeaking or chirping noise? If yes, go to step 8. If no noise exists, go to step 10.
  5. Remove the blower motor, and inspect the blower motor and impeller for deposits of foreign material. If there is debris, go to step 7. If there is no debris, go to the next step.
  6. Inspect the blower motor impeller for cracked blades, loose impeller retainer, or improper impeller alignment. If any of these conditions exist, go to step 8. If none of these exist, go to step 9.
  7. Remove the foreign material, go to step 10.
  8. Repair or replace blower motor or impeller as needed, go to step 10.
  9. Install the blower motor, go to step 10.
  10. Operate the system in order to verify the repair. If the condition has been corrected, the repair is complete. If noise still exists, repeat the entire procedure.

Nov 06, 2010 | 2006 Kia Sportage

1 Answer

I need to install a heater core for a 2001 Pontiac bonneville I need instructions on how to remove and install it.


prev.gif next.gif HEATER CORE REMOVAL AND INSTALLATION 1997–01 Models BONNEVILLE AND LESABRE
  1. Disconnect the negative battery cable.
  2. Drain the cooling system into a clean container for reuse.
  3. Remove or disconnect the following:
    • Heater hoses from the heater core
    • Right sound insulator
    • All necessary electrical connectors and remove the instrument panel compartment
    • Temperature valve actuator
    • Electrical connector and remove the HVAC programmer
    • Heater core cover-to-heater assembly screws and the cover
    • Heater core-to-heater assembly screws and the heater core Fig. 1: View of the heater hoses and clamp positions — 1997–01 Bonneville and LeSabre 93111g71.gif
      Fig. 2: View of the heater core cover — 1997–01 Bonneville and LeSabre 93111g72.gif
    To install:
  4. Install or connect the following:
    • Heater core and the heater core-to-heater assembly screws, then, tighten the screws to 12 inch lbs. (1.4 Nm)
    • Heater core cover and the cover-to-heater assembly screws, then, tighten the screws to 12 inch lbs. (1.4 Nm)
    • HVAC programmer and connect the electrical connector
    • Temperature valve actuator
    • Instrument panel compartment and connect any necessary electrical connectors
    • Right sound insulator
    • Heater hoses to the heater core
  5. Refill the cooling system.
  6. Connect the negative battery cable.
  7. Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

Jul 01, 2010 | 2001 Pontiac Bonneville

2 Answers

How to install a new top and bottom hvac heater hose fitting for a 2002 buick lesabre custom


The hoses are moved by turning them a few degree's, then pulling them off. See diagram below.

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Jun 19, 2010 | 2002 Buick LeSabre

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