96 gmc safari - warm air will not blow into passenger compartment - have replaced thermostat and vacuum line - heater core and blower are working properly
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Saturday, January 14th, 2012 AT 5:52 PM
9 Replies
FIXITMR
MECHANIC
9,990 POSTS
Sounds like blend door is not working right.
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Saturday, January 14th, 2012 AT 6:03 PM
RASMATAZ
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Inspect the air blend/mode/recirc doors/actuators/vacuum hoses-also check the HVAC control module
Heater core could be blocked. Disconnect the lines and backflush. If that is the cause do it a few times to get it really cleaned out and the water comes out clear.
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Saturday, January 14th, 2012 AT 10:24 PM
FIXITMR
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Dont sound like core is plugged.
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Sunday, January 15th, 2012 AT 2:59 AM
FIXITMR
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Look for a electric temp control motor undr lower right side of dash on hvac case.
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Sunday, January 15th, 2012 AT 6:15 AM
MIKE H R
MECHANIC
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With heater core eliminated then continue to follow fixitmr on checking the electric control motor.