LT1-LT4 Modifications 1993-97 Gen II Small Block V8

No!! Why is my heater/ac only blowing through the top dash and floor??

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Old 02-23-2009, 12:01 AM
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Default No!! Why is my heater/ac only blowing through the top dash and floor??

I was changing out an emission vacuum line(the decently long one that runs under the throttle body) and for some reason some time after that my ac/heater only blows air through the top upper dash and floor. What do I do to fix this??
Old 02-23-2009, 12:09 AM
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look at the vacuum line next to your ecm with the check valve in it. if its broke or has a hole. it can be that if not follow the line going down to the vacuum storage canister make sure everything is connected. other than that could be ur controls or vacuum lines back there.
Old 02-23-2009, 12:11 AM
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My 00 ford truck did that and it was a vac leak.
Old 02-23-2009, 12:15 AM
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my car did this to me like 2 weeks ago. I got scared, I thougt my controls had taken a ****. I got to school and I moved the switch again and it worked.

no problems since. :crossfingers:
Old 02-23-2009, 12:39 AM
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Agree, definitely caused by lack of vacuum to the environmental controls. Check for leaks.
Old 02-23-2009, 06:48 AM
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http://shbox.com/1/4th_gen_tech2.html#HVAC_vacuum
Old 02-23-2009, 07:16 AM
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I believe every lt1 owner owes you .. sent my pittance
Old 02-24-2009, 12:04 AM
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Originally Posted by integraxtc
my car did this to me like 2 weeks ago. I got scared, I thougt my controls had taken a ****. I got to school and I moved the switch again and it worked.

no problems since. :crossfingers:
which switch did you move?? the a/c selector switch??
Old 02-24-2009, 01:26 AM
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yeah, the one far right.



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