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What is wrong with the heater?

Tiny
DAVID88888888
  • MEMBER
  • 1996 GMC SAFARI
  • 185,000 MILES
96 gmc safari - warm air will not blow into passenger compartment - have replaced thermostat and vacuum line - heater core and blower are working properly
Saturday, January 14th, 2012 AT 5:52 PM

9 Replies

Tiny
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
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect the air blend/mode/recirc doors/actuators/vacuum hoses-also check the HVAC control module
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Saturday, January 14th, 2012 AT 6:04 PM
Tiny
FIXITMR
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Read here. http://www.ehow.com/how-does_4779539_troubleshooting-astro-van-heating-problems.html
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Saturday, January 14th, 2012 AT 6:15 PM
Tiny
FIXITMR
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Are hoses on firewall at core hot?
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Saturday, January 14th, 2012 AT 6:26 PM
Tiny
DAVID88888888
  • MEMBER
  • 2 POSTS
Yes, the hoses are hot.
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Saturday, January 14th, 2012 AT 6:39 PM
Tiny
MIKE H R
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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
Tiny
FIXITMR
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Dont sound like core is plugged.
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Sunday, January 15th, 2012 AT 2:59 AM
Tiny
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
Tiny
MIKE H R
  • MECHANIC
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With heater core eliminated then continue to follow fixitmr on checking the electric control motor.
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Sunday, January 15th, 2012 AT 4:22 PM

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