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Old 11-11-2008, 06:31 AM   #1
Ds86C10
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Heater Box Vacuum Source???

i have no control over my heater box. i slide the selector to any position and it blows out air where ever and when I come to a stop the air mix door moves so I lose heat! what is going on here??? its like i have no vacuum... So where is the source of vacuum for the controls come from??? i need help asap since its freezing cold and i cant drive down the road like Ace Ventura again when my windsheild needs defrosting.... Thanks
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Old 11-11-2008, 06:41 AM   #2
grinch4om
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Re: Heater Box Vacuum Source???

check your vacuum canister, there should be a one way vacuum valve in line with the canister, my bet is this valve is missing or non functioning
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Old 11-11-2008, 03:03 PM   #3
Ds86C10
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Re: Heater Box Vacuum Source???

thats in the front of the engine compartment behind the driver side headlight right? anyone have a picture of what it should look like??? it would be great help!
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Old 11-11-2008, 07:04 PM   #4
grinch4om
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Re: Heater Box Vacuum Source???

no, that is the vapor canister. the vacuum canister was round in my truck(84 GMC) and on the firewall 0n the drivers side
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Old 11-12-2008, 05:38 AM   #5
Ds86C10
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Re: Heater Box Vacuum Source???

ok thanks man!
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