WHAT IS WRONG WITH THE HEATER?

1996 GMC Safari

Tiny

David88888888

January, 14, 2012 AT 5:52 PM

96 gmc safari - warm air will not blow into passenger compartment - have replaced thermostat and vacuum line - heater core and blower are working properly

FOUND 4701 RELATED QUESTIONS

Heater

17 ANSWERS
11 IMAGES

9 Answers

Tiny

fixitmr

January, 14, 2012 AT 6:03 PM

Sounds like blend door is not working right.

Tiny

rasmataz

January, 14, 2012 AT 6:04 PM

Inspect the air blend/mode/recirc doors/actuators/vacuum hoses-also check the HVAC control module

Tiny

fixitmr

January, 14, 2012 AT 6:26 PM

Are hoses on firewall at core hot?

Tiny

David88888888

January, 14, 2012 AT 6:39 PM

Yes, the hoses are hot.

Tiny

M_H_RITZEL

January, 14, 2012 AT 10:24 PM

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.

Tiny

fixitmr

January, 15, 2012 AT 2:59 AM

Dont sound like core is plugged.

Tiny

fixitmr

January, 15, 2012 AT 6:15 AM

Look for a electric temp control motor undr lower right side of dash on hvac case.

Tiny

M_H_RITZEL

January, 15, 2012 AT 4:22 PM

With heater core eliminated then continue to follow fixitmr on checking the electric control motor.

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