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Rear heater wont switch from a/c to heat - 2005 GMC Yukon

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Did you ever get a solution to this problem? I'm having the same issues and the GM Goodwrench On Demand Diagnostics shows no codes or errors.

Posted on Dec 10, 2013

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Heated rear seats


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Rear heat or rear air conditoner not workin in my 1997 gmc safari


two different problems !

Rear heater problem: find under the hood where is hose for cooling liquid goes to front heating core!
you will see there also vacuum tubesgoing in to little valve ! disconnect the vaccum tubes ( engine off)
and spray in wd 40 in to the vlave ... valve is stuck and wont open flow to rear heater !

you do not have to replace tha thing . its very well made and because you dont turn this often in summer
it gets stuck. i had same problem. also make sure vacuum is working - Engine running turn rear heater on - vacuum sucks to open valve. and before that make sure fuse is ok .

for rear AC mine does not work either and it is leak on pipes that go from front to rear .. 10 feet of pipes and tubing $$ expensive repair ... forget it ... open the window...

jebadiah

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The rear heater does not generate heat - only cold air in vents


does front air work properly? for heat i mean?.. the blend doors are suspect as well as the heater hoses to the rear core and its heater valve.. possibily the control head is to blame or?, but i cant tell from here

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