The thermostat is stuck on HIGH so heat blows in even with fan set to off! how can i demobilise this temp measure as need to travel and its HOT!
SOURCE: Engine running hot
Sounds like your antifreeze level is low. When it flows you get hot air and when there's an air bubble due to lack of antifreeze all you'll get is air.
SOURCE: Heating system only blows out hot air through the vents
I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.
Avalanche, Sierra And Silverado
To install:
C/K Series
To install:
SOURCE: Heater only blows hot (well, warm) on full speed of fan
Replace the temp control on this car, it should be electrical control not cables.
SOURCE: 2005 MALIBU - HEATER BLOWS BUT NO HEAT
could be vaccum leak in the a/c panel where the flappers open and close to allow hot and cold air to blow
SOURCE: cooling fan relay location on a 2005 gmc sierra
Check the fan clutch operation. And also check for leaks.
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