my heat blows cold unless i have defrost on then it blows warm

2001 PONTIAC MONTANA
150,000 MILES
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JBASEY
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  • 5 POSTS
when i turn on my heat it comes out cold but when i turn on defrost it blows warm
Nov 7, 2011 at 10:46 PM
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RIVERMIKERAT
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Check the vacuum and electrical lines to the air doors. One is most likely loose or missing.
Nov 7, 2011 at 10:49 PM
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JBASEY
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where are the vacuum air doors
Nov 7, 2011 at 10:52 PM
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JBASEY
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thankyou for the response where are the electrical lines and vacuum air doors located
Nov 7, 2011 at 11:16 PM
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RIVERMIKERAT
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The AC/heater blower assembly is located under the dashboard, and behind the glovebox. Take a look at the pictures.
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Nov 7, 2011 at 11:19 PM