Question about 1985 Chevrolet Celebrity

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Heater blower will not change from defroster to lower level heat

When I try to select the lower level setting for my heater, it remains on the defroster mode. what is wrong? what needs to be done?

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You are loosing vacuum either in the storage or the line feeding the cabin is leaking

Posted on Dec 30, 2008

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What all can make the heat stop working? Blower works but no Defrost an no heat.just. cold air. Changed thermostat changed lower rad.hose


The controls that let hot water flow through the heater core may not be working or the core is plugged stoping all water from entering. Easy way to test is with the engine up to operating temp, touch both hoses going to the heater. If one is colder than the other, the heater core is not getting enough hot water.

Jan 23, 2016 | Cars & Trucks

1 Answer

Both aux fans remain on from cold startup. is it more likely the radiator temp switch than the fan relay?


fan relay more than likely, but I think think it would stay on all the time even with key off, could be wrong tho. sounds to me like you have your air condition on, or heater set to defrost as defrost basically runs the air conditioning compressor and cooling fans when defrost is on.

Dec 09, 2013 | 1997 Jaguar XJ6

2 Answers

Only get defroster. won't change to other levels.


That heater control is powered by vacuum. There is a small hard plastic vacuum hose going through the firewall next to the brake booster. This plastic line feeds the control panel and is either cracked or disconnected from the control panel. If your heat is only warm, then your thermostat is probably bad.

Dec 06, 2013 | 1993 Plymouth Acclaim

1 Answer

2005 nissan sentra 1.8 se has cold air blowing from inside vents with temp select switch set on the HOT position. What could be the cause of this problem?


Sounds like the heater - ac door actuator is not working. This part would need to be replaced, it's not repairable.

Nov 24, 2013 | 2005 Nissan Sentra 1.8

1 Answer

Heat stopped working in 2000 pontiac sunfire


With blower on high and tempature to max heat check to see if you have good air flow in all mode selections (defrost, vent, floor etc.). If so and you still have no heat then check heater core hose going from engine to inside car to heater core with vehicle running and coolant tempature about half on guage. If both hoses are hot and coolant in radiator/overflow bottle is full then hot cold blend door is stuck in cold position. If coolant level is low you will get no heat, check coolant level first.

Dec 18, 2011 | 2000 Pontiac Sunfire

1 Answer

Heater and AC and blower all work fine but it all blows out of defroster vents thats about it , when AC is on it comes out defroster vents,no matter your selection. Heater is the same way.


The HVAC mode selections on these are controlled by an electric stepper motor that receives commands from the BCM (body control module). The BCM decides where the air door should be by looking at where the dash control input is.
Each mode selected has a different resistance level. From low resistance to high resistance: Panel, Bi-Level, Floor, Mix and Defrost, with Defrost as the highest resistance (~100K ohms). A high resistance or open circuit would probably default the system to defrost no matter what position the mode control was set to.
If the control is dirty or there is a connection issue, this could cause this problem. Does playing with the control make any difference?
The BCM can store fault codes with HVAC releated information. The system can be reset and recalibrated with a battery disconnect, this will also erase any fault codes.
I would start by looking at the dash mode control.

Good luck, i hope this helps.

Jun 28, 2011 | 2006 Chrysler PT Cruiser

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

The heat in my 2006 grand prix will not get hot. We replaced the thermostat and got nothing. So I got the radiator flush and force filled again. Still nothing. Temp of the motor still gets to the middle,...


Are the 2 tubes that go to the heater core getting hot? If so, then the blend door is not opening to allow heat to get to the cabin.

Possible vacuum motor problem, either disconnected, or the controller for the blend door is broken is likely problem.

Troubleshooting by Symptom 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.
Air Door Actuators/Motors Removal & Installation Recirculation Actuator To Remove:
  1. Remove the right lower instrument panel (I/P) insulator.
  2. Remove the glove box assembly. Recirculation actuator (Typical) gm-10-00-3695.gif

  3. Remove the mounting screws and recirculation actuator from the HVAC module assembly.
  4. Disconnect the recirculation actuator harness connector.
To Install:
  1. Align the recirculation actuator slots with the flats on the actuator door shaft.
  2. Install and secure the recirculation actuator on the HVAC module assembly with the mounting screws.
  3. Connect the recirculation actuator harness connector.
  4. Install the glove box assembly.
  5. Install the right lower I/P insulator.
  6. Calibrate the recirculation actuator.
Mode Actuator To Remove:
  1. Remove the right lower instrument panel (I/P) insulator.
  2. Remove the glove box assembly. Mode actuator gm-10-00-4356.gif

  3. Remove the mounting screws and mode actuator from the HVAC module assembly.
  4. Disconnect the mode actuator harness connector.
To Install:
  1. Align the mode actuator slots with the flats on the actuator door shaft.
  2. Install and secure the mode actuator on the HVAC module assembly with the mounting screws.
  3. Connect the mode actuator harness connector.
  4. Install the glove box assembly.
  5. Install the right lower I/P insulator.
  6. Calibrate the mode actuator.
Air Temperature Actuator Right Side To Remove:
  1. Remove the right lower instrument panel (I/P) insulator.
  2. Remove the glove box assembly. Air temperature actuator (right side) gm-10-00-4356.gif

  3. Remove the mounting screws and right air temperature actuator from the HVAC module assembly.
  4. Disconnect the right air temperature actuator harness connector.
To Install:
  1. Align the right air temperature actuator slots with the flats on the actuator door shaft.
  2. Install and secure the right air temperature actuator on the HVAC module assembly with the mounting screws.
  3. Connect the right air temperature actuator harness connector.
  4. Install the glove box assembly.
  5. Install the right lower I/P insulator.
  6. Calibrate the mode actuator.
Left Side To Remove:
  1. Remove the left lower instrument panel (I/P) insulator. Air temperature actuator (left side) gm-10-00-4357.gif

  2. Remove the mounting screws and left air temperature actuator from the HVAC module assembly.
  3. Disconnect the left air temperature actuator harness connector.
To Install:
  1. Align the left air temperature actuator slots with the flats on the actuator door shaft.
  2. Install and secure the left air temperature actuator on the HVAC module assembly with the mounting screws.
  3. Connect the left air temperature actuator harness connector.
  4. Install the left lower I/P insulator.
  5. Calibrate the mode actuator.

Oct 18, 2010 | 2006 Pontiac Grand Prix

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