We could probably help a little better if we new the year and type of truck you were having the problem with, but I would guess the switch or relay. The fan could also be going out and will only spin at the higher speeds. Is it making any strange noises?
Mor ethan likely it is your blower motor Resistor those are a common occurence and easy to fix. but like stated we need more info. Is it only A/C or is it both A/C and heat settings? Year make of vehicle.
I can't get any hot air to blow, and the AC recently has stopped blowing cold air. I've replaced the thermstat, the actuator (mechanism that opens and closes the flap switching from hot engine air to fresh air), and this morning I replaced the control on the dash. The heater hasn't been working for some time. The AC just recently stopped blowing cold air, I'm thinking I might need to add a can or two of freon. I'm not sure what to try next. The vehicle is a 1998 GMC Suburban. Thanks! Brent
brent i would check to see if your system is plugged up some where first pull on of the heater lines off at the fire wall near the ac dryer and look or try to pass water throught with a garden hose low pressure if nothing comes out then your heater core is proalby plugged up not allowing it to warm up also a good time to pressure check your system to make shure your not leaking coolant out the back of the intake as for your ac you proalby have the original compressor with the 2 piece body and it leaks out at the center if you stick your hand under the conpressor (while its cool) and theres alot of black crud then its leaking and needs replacement ac delco has a revized model that takes care of that problem its a once piece unit and its fairly cheep also
A forum community dedicated to all General Motors truck owners and enthusiasts. Come join the discussion about performance, lift kits, wheels, tires, modifications, troubleshooting, maintenance, and more!