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My heat blows cold unless I have defrost on then it blows warm

Tiny
JBASEY
  • MEMBER
  • 2001 PONTIAC MONTANA
  • 150,000 MILES
When I turn on my heat it comes out cold but when I turn on defrost it blows warm
Monday, November 7th, 2011 AT 10:46 PM

4 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Check the vacuum and electrical lines to the air doors. One is most likely loose or missing.
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Monday, November 7th, 2011 AT 10:49 PM
Tiny
JBASEY
  • MEMBER
  • 5 POSTS
Where are the vacuum air doors
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Monday, November 7th, 2011 AT 10:52 PM
Tiny
JBASEY
  • MEMBER
  • 5 POSTS
Thankyou for the response where are the electrical lines and vacuum air doors located
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Monday, November 7th, 2011 AT 11:16 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
The AC/heater blower assembly is located under the dashboard, and behind the glovebox. Take a look at the pictures.
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Monday, November 7th, 2011 AT 11:19 PM

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