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John, ASE Certified Technician
Category: Cadillac
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2005 cadillac deville: blows cold..the passengers side..drivers side

Resolved Question:

in my 2005 cadillac deville my a/c blows cold on the passengers side an hot on the drivers side. and now its not blowing cold at all in this heat. ?How do i fix it?
Submitted: 8 years ago.
Category: Cadillac
Expert:  John replied 8 years ago.


Your vehicles ac system is computer controlled & when it blows cold on one side & hot on the other it is usually a failed temperature actuator motor for the side that blows hot.Since your problem is now hot on both sides ,I suggest you have the system checked for the correct amount of freon.If there is a low freon code in the computer memory this will need to be cleared after charging the system for the computer to turn on the compressor.

Customer: replied 8 years ago.

Its blowing hot now on both sides now but i got a gauge meter to read how much freon is in it and its reading full









Expert:  John replied 8 years ago.

Is the compressor comming on ?

what are the readings on the gages -high & low with engine running ?

Customer: replied 8 years ago.
yes the compresser is working and shifting plus the low in coolite line is freezing cold the gauge on the meter was reading full but it was hot out side.We only put ane can of freon init and it blow cold for 3 days and went back to blowing on both sides.I checked for leaks and there is none.
Expert:  John replied 8 years ago.

Is the compressor on now & the low side line cold ?

Customer: replied 8 years ago.
Expert:  John replied 8 years ago.

OK you can try to reset the ac control calibtrations.


Actuator Recalibration

Calibration Procedure with a Scan Tool

Use the following steps to perform the calibration update:

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, select Instrument Panel Module.
  4. Select Special Functions.
  5. Select Miscellaneous Test.
  6. Select Recalibrate all Motors.
  7. Select ON, wait 30 seconds.
  8. HVAC Door Calibrations will display Cal OK.

Calibration Procedure without a Scan Tool

  1. Turn OFF the ignition.
  2. Remove the battery positive voltage circuit fuse of the Instrument Panel Control Module.

    Important: The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.

  3. Wait 60 seconds.
  4. Install the fuse.
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