Question about GMC Yukon
Heat,? and no year? wow.
you didnt say, its it fully hot in any mode?
is the heat 100% fully hot at feet. my cars will drive you out of car in no time flat , on full heat. but id dont live in the YUKON
were are you Nunavut or key west?
but your defrost damper is bad.
once the core is fully hot, and fan at max
all that remains is damper. depends on year, but a filter. in newer cars can clog.
there is a fresh air recirc, that mixes in fresh air, aiding defrost as does A/C ops. all this is the dampers (flappers)
some cars are call cable driven , they are easy to check.
if the cable end is dead, bingo, so will be its damper.
just like a kids bike, bad cable, no brakes. it works just like kids bike.
or some cars have this very complex vacuum system.
if your car has that, then read the manual. FSM
or alldata.com. at anythim..
Posted on Oct 20, 2013
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Posted on Jan 02, 2017
Look for a vacuum leak to the heater contols,most likly a hose fell off at the intake manifold area.I bet the engine is running a little fast also.
Posted on Jan 16, 2009
either a vacumn pipe is broken or the ends split so its not passing a vacumn to open the flaps,where they are and how to get to them i cant help because i have never worked on one as they are not here in spain.check the engine end first though .Look for some small rubber pipes running from the inlet manifold
Posted on May 30, 2009
There is a flap that directs the air. the flap is controlled by a vacuum actuator. This is located inside the venting. The actuator is connected to little vacuum hoses that attach to the temperature control switch. Either the flap is stuck, or the actuator has gone bad.
Posted on Jul 01, 2009
you may have abad slector door acuator.which is alittle motor bolted on the heater box.It move a door in box to direct air flow to right location.hope this helps.
Posted on Sep 27, 2009
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