1999 GMC Jimmy "heater control work" Questions

heater control is stuck on HOT. the control is stuck on hot and the control nob is a dealer part.I dont want to buy it if its not the problem. How do i know if it is the control or the vaccume diafram

...control a servo which opens and closes the coolant flow valve. This is usually located inside the housing surrounding the heater core/ducting, and should be on the inlet of the heater core

...heater control cable that runs from the dash to just above the heater core which is on the passengers side below the glove box. It may have come disconnected. When you move the control from cold to ...

...control. Thanking you in advance. Suggestion: see if the blend door opens or closes completely to allow all air through the heater core. To see the blend door moving, remove the panel that says "Cut ...

Heater/AC Quit working 2003 Hyundai XG 350 heater/ac quit working Check the fuses first then check to see if you hvac (heat, vent,a/c) control switch is bad by check the signal voltage.

heater temp control not working blows heat all the time no matter where i set temp control,also a/c isnt working We had the same problem in our 98 GMC Jimmy. Was blowing hot air everywher with ...

...heater, which is under the passenger side dash you have to pull off the face plate to heater controls see why its not turning sonds like the vent cable is getting in the way of the temp control ...

heater not heating ? both hoses hot , fan works but no hot air ? is the climate control switching over like from floor to defrost to vent ? maybe the flap door not working in heater box.both hoses are

heater control valve under the hood to control the coolant flow to the heater core. It would be located by the firewall, and would have a heater hose attached to it, and have another hose entering the

...tempature sentor and thermostat.. Do you feel heat on both heater core hoses? If not then it might have a blocked heater core, low coolant level, defective heater control valve or a blend door