2002 Dodge Ram 1500 Q&A
2002 Dodge Ram 1500 Question: Heat and ac problem
Everything in this truck is new but my heat will not work , it will not change from floor to vents and the ac will not even come on . It just blows normal air in the floor , it will not heat up or cool down . No blown fuses and everything down to the thermostat , waterpump and heat/ac controls are new . Is it a relay ? If so , which one ? My fuse panel does not even list a heater fuse !! Please help , its getting cold outside !!! - Doc 48
You must have a 2003 as 2002 did not offer a 4.7L engine. There is also a Technical Service Bulletin addressing this issue for a 2003 DR Ram Truck. TSB NUMBER: 24-004-03; GROUP: Heating & A/C; DATE: June 13, 2003 This bulletin is supplied as technical information only and is not an authorization for repair. SUBJECT: Defrost Door Inoperative This bulletin involves replacing the defrost door and lower half of the heater, A/C (HVAC) housing. MODELS: 2003 (DR) Ram Truck SYMPTOM/CONDITION: The defrost door may break at the pivot shaft causing inadequate travel. The system may not completely close causing a lack of air discharge out the floor vents and full discharge from the defrost outlet. This may be caused by a broken actuator stop on the heater A/C (HVAC) housing. I recommend you visit your local dealership for more inspection, diagnosis and repair. - Johnny Mopar
The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem d...
Some vehicles may develop a musty odor coming from the HVAC system, Dodge has issued a cleaner/disinfectant and a coating for the evaporator designed to inhibit bacterial growth.
Heater will not warm up or change from floor to vent or defrost and ac will not come on . Everything is new , water pump , thermostat , heat / ac controls . No blown fuses . There is no fuse marked...
I checked and the low side shows 45psi after charging it. The compressor does kick in and is running. The low side line is cold to the touch also. The drain hose that comes out of the firewall i...