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Author Topic: Air comming out A/C vents when on Heat and Defrost  (Read 3363 times)

Offline Kelsfine69

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Air comming out A/C vents when on Heat and Defrost
« on: September 30, 2009, 04:23:26 pm »
I have a 1987 Silverado with A/C. When its on heat I get some air "bleeding" out the A/C vents. Same when I go to Defrost and then when I go to A/C or vent I get more airflow from the dash vents. Is there something I can check without tearing the whole hearter box out? Everything seems to work ok but I dont like warm air blowing in my face when i have the heater on. Thanks
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Offline VileZambonie

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Re: Air comming out A/C vents when on Heat and Defrost
« Reply #1 on: September 30, 2009, 07:34:15 pm »
Make sure the vacuum hose is hooked up in the engine compartment coming out of the firewall to a vacuum source.
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Offline Kelsfine69

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Re: Air comming out A/C vents when on Heat and Defrost
« Reply #2 on: October 01, 2009, 09:02:54 am »
yea like I said everything works but some air comes out the vents when on heat. I wonder if the heater control could be leaking?
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