Question about GMC Yukon

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Heat comes out barley out the defrost but blows out at your feet why would that be

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  • GMC Master
  • 20,706 Answers

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

  • 41 Answers

SOURCE: 1999 Dodge Intrepid Heating/Air Conditioning

check out selector switch,vacuum hoses ,check transfer door write if did not solve

Posted on Oct 29, 2008

  • 2 Answers

SOURCE: '04 Jeep Grand Cherokee: Heats...but only through defrost vents.

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

alicantecoli
  • 22095 Answers

SOURCE: a/c and heater only blow air out of defrost

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

MNfisherman
  • 11896 Answers

SOURCE: Jeep AC blows cold air at defrost and feet but not through vents

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

johnjohn2
  • 5763 Answers

SOURCE: Air blows only on windshield even when placed on vents or feet

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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2 Answers

Vents won't blow hot or cold air. Comes from defrost and feet when you put fan on.


It's the vent actuator, it moves the baffle that changes the direction of the air flow.
Here is a video of a broken vacuum hose that creates the same problem.

It could also be a failed actuator.

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1st. make sure it is full of antifreeze/water. The defrost will be colder because the A/C comes on when defrost is turned on. The next thing is you may have a heater valve not opening as it should. Vacum or elect. heater valves have to open so hot water can flow for heat thru the heater core........hope this helps..

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Air blows only on windshield even when placed on vents or feet


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.

Sep 27, 2009 | 2000 Dodge Durango

1 Answer

A/c and heater only blow air out of defrost


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

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