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- - Heater Box Vacuum Source??? (https://67-72chevytrucks.com/vboard/showthread.php?t=314102)

Ds86C10

11-11-2008 06:31 AM

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

grinch4om

11-11-2008 06:41 AM

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

Ds86C10

11-11-2008 03:03 PM

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!

grinch4om

11-11-2008 07:04 PM

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

Ds86C10

11-12-2008 05:38 AM

Re: Heater Box Vacuum Source???

ok thanks man!

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