heater

The heater blower motor sometimes starts up by itself but if it's not blowing and I give it a whack with my fist under the glove compartment it seems to start up just fine. I don't know if it's the motor or a switch or a resistor if someone could point me in the direction of what I need to...

My 1993 gmc jimmy s15 4.3l 4wd hvac controls stopped working and i have not found any vaccum leaks at all. any ideas what i can do to get the system working again, not entirely ready rip apart the whole dash. just want to be able to use the ac in the truck for summer

Hi, my name is Scott and i just purchased a used 2005 GMC Sierra. just like all used vehicles it needs a few things repaired. I am currently working on my A/C and heater controls. The heater is stuck on, no matter what possition the temperature is set at. I know there are a number of things...

Initial problem a couple years ago was HVAC would occasionally spontaneously start blowing full hot when AC was on. I found stopping and turning off ignition would correct this until next sporadic occurrence. Lived with this for a while figuring heater HVAC control replacement would...

When I turn the heat on and raise the temp controllers to HOT, the fan motor blows air, but it NEVER gets hot. Not even warm... Any idea what can cause this? The engine temp runs around 190. Thanks in advance!

I am having an issue with my '05 Yukon Denali XL's heater blower. The core is making heat, however, the fan sporadically will not come on for long periods of time. The fan for the rear seats (both upper and lower) seems to be working fine and comes on/adjusts intensity with the controls. I...

My 2003 Sierra has dual climate control it is now only blowing hot air no matter where the levers are set. Seems to go in and out. Is this the control unit or the heater core?