2004 Chrysler Concorde No hot air & No cold air

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.

1 Reply

KHLOW2008

MECHANIC
41,815 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:
"� Lack of cold air
"� Lack of hot air
"� Unrequested mode change (ATC only)
"� 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):

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