Mechanics

WHAT IS INVOLVED IN FIXING A HEA

2005 Cadillac Escalade Esv

Heater problem
2005 Cadillac Escalade Esv V8 All Wheel Drive Automatic 105000 miles

I can't run the air conditioning in the front half of the car because a mixture of the heated air from the heater and the air conditioned air come out of those vents even if set to 60 degrees. I can run the separate air conditioning in the middle and back half of the car fine. I checked the refrigerant and it is at the proper pressure. The fuses are ok. The belts are ok. The climate control panel / computer seems to work otherwise. Apparently in my car, 2005 Cadillac Escalade ESV, there is no valve in the heated or cooled pipes, but instead vents that open and close. My theory is that the heater one is stuck open. Is this something I can get to and replace? Where is it? About how much in labor and parts can I expect if I bring it in and ask them to do only the work that I ask them to do? Every time I bring it in anywhere they seem to fix a few other things that " were probably broke too" until they find the right thing to fix.
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RickB440
July 23, 2010.



Try first removing the HVAC/ECAS fuse in the underhood fuse block for about 60 seconds. Turn the key on, this initiates a recalibration of actuators. See if that corrects it, and it may only be for a while. You could have a faulty actuator, it could just need the climate module reprogrammed. Here is a bulletin that could fit your symptom.

#06-01-38-003: Intermittent Ticking Noise from I/P, Poor A/C Performance, HVAC DTCs B0229, B0414, B0424, B3770, (Reprogram HVAC Control Module) - (Apr 27, 2006)

Subject: Intermittent Ticking Noise from I/P, Poor A/C Performance, HVAC DTCs B0229, B0414, B0424, B3770 (Reprogram HVAC Control Module)

Models: 2004-2006 Cadillac Escalade Models

2004-2006 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2004-2006 GMC Sierra Models, Yukon Models

with Air Conditioning (RPOs CJ2, CJ3)

Condition
Some customers may comment on one or more of the following concerns: • Intermittent ticking/clicking noise from the instrument panel.

• Recirculation mode does not work or Air Conditioning (A/C) system performance is poor during high ambient temperatures.

• Unable to control the driver side temperature.

• Unable to control the passenger side temperature.

• Unable to change the front system modes.

Cause
This condition may be caused by the Heating, Ventilation and Air Conditioning (HVAC) actuators that may hunt for the correct commanded position. This cycling may cause a clicking or ticking noise.

An overtravel of the HVAC system control doors may cause one or more of the concerns listed above. If an overtravel occurs, a Diagnostic Trouble Code (DTC) will be set, and the door will go to a preset default position. When a system door defaults, that door will stay at the default position until the DTC is cleared. After the DTC is cleared, the door will operate properly until the overtravel condition re-occurs.

The following table lists the HVAC system doors and the DTC associated with it.

System Door
Overtravel DTC

Air inlet door (recirculation door)
B0229

Left temperature door
B0414

Right temperature door
B0424

Front system mode door
B3770

Correction
Technicians are to perform the normal diagnostic procedures in SI for these concerns. If diagnostics show that the HVAC system door(s) travel below 5 counts (out of the lower range) or above 250 counts (out of the upper range), then update the software calibrations in the HVAC control module. The new calibrations were made available to dealerships as part of TIS2000 incremental satellite update version 2.5, which was broadcast to dealers in February 2006.

The new calibrations have been updated to compensate for the actuator overtravel condition, the actuator hunting and the ticking/clicking noises. The new calibrations effectively eliminate the codes listed above, the default position of the doors associated with the DTCs and opens up the feedback position value. The new calibrations should not be used unless the vehicle has one or more of the customer concerns listed above or a DTC listed above has been set. The new calibrations will not correct any other DTC or A/C system performance concern.

You would need a scan tool to check for codes, and /or monitor hvac data. The reprogramming would most likely be done at a dealer. Usually if one side seems to be stuck in one position(hot/cold) it is indicative of an overtravel of an actuator, and the system has defaulted it's position.

Factoryjack
Jul 24, 2010.