2004 Chrysler Concorde No hot air & No cold air

Tiny
BSCHRAMM
  • MEMBER
  • 2004 CHRYSLER CONCORDE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 76,000 MILES
My 2004 Concorde has warm air in the winter, but not hot air blowing. Also, the AC air is cool but not cold. I had the AC checked for coolent levels and it was full. I have heard that it may be a air blending door that is bad? Is there any other solutions? Saw something about a M1 fuse to fix this problem. Where is that fuse and what is the procedure to reset the system be removing the M1 fuse? Thanks.
Thursday, May 27th, 2010 AT 8:21 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi bschramm,

Thank you for the donation.

Is your system Manual or Auto HAVC ?

Have you tried to retrieve for trouble codes?

DIAGNOSIS AND TESTING - ERRATIC OPERATION OF HVAC SYSTEM
Erratic operation of the A/C and heater systems including:
"Â Lack of cold air
"Â Lack of hot air
"Â Unrequested mode change (ATC only)
"Â No control of mode or temperature control or tapping blend door noise

These symptoms may be accompanied by the following Diagnostic Fault Codes (DTC's):

"Â Blend door feedback
"Â Blend door stall
"Â A/C Control Mode door input shorted to battery
"Â In-car temp sensor failure
"Â ATC messages not received
"Â Mode door stall

Check for the presence of DTC's with the DRB III(R). If the symptoms and or DTC's listed above are present, perform the following Repair Procedure:

With the vehicle at room temperature 10 to 27 ° C(50 to 80 ° F), pull the M-1 fuse for five minutes to erase any DTC's. Replace the fuse and start the vehicle to recalibrate the HVAC system. Operate the vehicle and A/C heater system to verify that symptoms and or DTC's are gone. If tapping noise or blend stall/feedback DTC's re-occur, additional diagnosis will be required.

The M-1 fuse is Fuse # 19 (15 A) in underdash fusebox. It is the one circled in Red.


https://www.2carpros.com/forum/automotive_pictures/192750_FuseBlock04ConcordeFig02_1.jpg

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Thursday, June 3rd, 2010 AT 12:33 PM

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