HOW TO REPLACE THE HVAC MODULE IN 2002 MONTANA

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Quote:

08-08-49-002: False Triggering of Low Coolant Level Warning Message (Reprogram HVAC Control Module) - (Feb 13, 2008)

Subject:
False Triggering Of Low Coolant Level Warning Message (Reprogram HVAC Control Module)

Models:
2007-2008 Chevrolet Silverado 2500 and 3500 Heavy Duty Series Only
2007-2008 GMC Sierra 2500 and 3500 Heavy Duty Series Only
with 6.6L Diesel Engine (VIN 6 -- RPO LMM)

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Condition
Some customers may comment that a "COOLANT LEVEL LOW ADD COOLANT" message is displayed in the Driver Information Center (DIC) even though the coolant level is normal.

Cause
This condition may be caused by a false reading during off-road driving or in high slush conditions.

Correction
Do This - Reprogram the HVAC control module.
Don't Do This - Do not replace the coolant level sensor, HVAC control module or radiator surge tank.


A revised calibration has been developed to address this condition. Technicians are to reprogram the Heating Ventilation and Air Conditioning (HVAC) control module with the latest software available on TIS2WEB. Refer to the Service Programming System procedures in SI. As always make sure your Tech 2 is updated with the latest software version.


Warranty Information
For vehicles repaired under warranty, use:
Labor: Operation D4707
Description: HVAC Control Head Module or Assembly Reprogramming with SPS
Labor Time: Use Published Labor Operation Time

the cover on the wiper motor is intermitant module . change it most of the problem come from that module

I think these two problems have a common solution. When they do not work check for power at the HVAC Blower Fuse in the instrument panel fuse block. Check this with a volt meter. You should see battery voltage at the fuse. If you see no voltage or very little than I would bet you have a bad ignition switch. The switch is what supplies power to the fuse.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

You may not have to. If the blower resistor is near the blower motor that should be tested first(cheaper part too). Sometimes they go and the result is a one speed or no speed fan.

no it is a blower motor resister that is bad it only has two /three screws its on the heater box if I remember right it is behind black cover on fire wall very easy to change

You have problem with coils and module.One of things is bad and need to replace.Get code reader to check the code.

The 2001 model Aztex has 2 cabin filters, they usually come 2 to a box when you buy them.
The charcoal carbon filters are the best.

Removal:

•Open the IP compartment door.
•Remove the rear inside IP compartment door.
•Open the HVAC module assembly access door
•Remove the RH passenger compartment air filter from the HVAC module.
•Slide the LH passenger compartment air filter to the HVAC module opening.
Remove the LH passenger compartment air filter from the HVAC module.

Installation Procedure:

•Install the LH passenger compartment air filter into the HVAC module opening.
Slide the LH passenger compartment air filter toward the left side of the HVAC module.
•Install the RH passenger compartment air filter into the HVAC module opening.
•Close the HVAC module assembly access door.
•Install the rear inside IP compartment door.
•Close the IP compartment door.

I Hope this information is helpful.

I beleive you need to change the Power Window Switches Module in the drivers side door panel, as these connections are interlinked within this module and it is usually the first part that fails. Especially that you already changed the switches & motor in the passenger door and it still does not work. Once you remove the dual switch module in the driver's side door, you will understand what I mean. Plus it is really easy to access. Good luck! I have the same model, Claude

Hi the DRL module is located under the IP (dash) just left of the HVAC(heater control)

not only does the dash require removal,but you will also need to completely remove the hvac module assembly from the vehicle after the dash is out of the way. the module will have to be diassembled in order to replace the core.--hvac module removal will require ac refrigirant recovery and coolant replacement.--it sounds like a lot of work but should only take you about one good saturday if its your first time around the block.---good luck.