Question about 2001 GMC Jimmy

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I have a 2003 jimmy that blows very little heat at level 4

I had it checked out by a few mechanics and one said it could be the thermostat, change it - not the problem. It needs a core flush - did that - not the problem - I don't know what it is is. Its strange because when you turn the control button to defrost it does not switch to defrost only the 1 setting and that is at the front only same if you move the button to the floor for heat - no change it stays at the same position. Then another mechanic did check the hoses and he said there is heat coming from hoses, he put a carboard piece in front of the rad it now has a little more heat but not what it is suppose to have and this is when you have the control button to level 4 - it should be super hot in the truck. What is going on, please help me, I am not mechanically inclined, and could it be a fuse? If so where are the fuse boxes in the truck or inside the hood of truck? What am I suppose to be looking for? At -50 in winnipeg last week for a few days it has not been fun driving.
Thank you
Patricia in Winnipeg, Manitoba

Posted by on

  • keela405 Dec 29, 2008

    Please help me with my problem-I know that someone will have a solution or has had a problem similar to mine.
    Thank you all


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It sounds like it could be the control panel or the A/C And Heater Control Calibration you can give this info to your mechanic... but if i were you i would go to gm dealer.replacing the wrong part will get expensive fast..... hopes this helps you..........................................A/C And Heater Control Calibration
Re-Calibrating Actuators (Primary)
When replacing the HVAC control module it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC control module be sure to perform the following:Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

  1. Place the ignition switch to the OFF position.
  2. Disconnect the scan tool.
  3. Install the HVAC control module.
  4. Connect all previously disconnected components.
  5. Start the vehicle.
  6. Wait 40 seconds for the HVAC control module to self-calibrate.
  7. Verify that no DTCs have set as current DTCs.
When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC actuator be sure to perform one of the following:Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted improper HVAC performance will result.
Alternate Method (W/O Scan Tool)
  1. Clear all DTCs.
  2. Place the ignition switch to the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Remove the HVAC B fuse for a minimum of 10 seconds.
  6. Install the HVAC B fuse.
  7. Start the vehicle.
  8. Wait 40 seconds for the HVAC control module to self-calibrate.
  9. Verify that no DTCs have set as current DTCs.
Preferred Method (W/ Scan Tool)
  1. Clear all DTCs.
  2. Place the ignition switch in the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Start the vehicle.
  6. With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
  7. Verify that no DTCs have set as current DTCs.

Posted on Dec 29, 2008

  • kelvin smotherman Dec 29, 2008

    there is a fuse not sure where it is . if you have the owners manual it will say hvac fuse

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