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Not getting enough vaccuum to operate heater controls

This is a discussion on Not getting enough vaccuum to operate heater controls within the General Help forums, part of the LSx Technical Help Section category; I have a 1979 camaro and wasnt getting enough vacuum to operate my heater controls. I dont see a vacuum ...

  1. #1
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    Not getting enough vaccuum to operate heater controls

    I have a 1979 camaro and wasnt getting enough vacuum to operate my heater controls. I dont see a vacuum tank anywhere and was wondering if my camaro should have one. The vacuum lines seem ok. Any suggestions would be appreciated. Thanks!

  2. #2
    Simpsons Did it!! 98formy's Avatar
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    You may have them hooked up to the wrong port off the carb. Do you have a big cam?
    TSP Torquer V2 cam, ported heads,fast 90/90 combo, LT's, 3400 stall, magnaflow CB, most other bolt ons, full suspension, t-top and HID conversion

    422 RWHP, 384TQ

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    I have a street cam...nothing too radical and i have it hooked to a quadrajet carb on the bottom where the highest vacuum is. The brakes and all work fine so it seems there is enough vacuum. There is just a teeny line coming from the firewall and i hooked it up but it didnt do any good. Should i replace all the lines? That will be a job...but i may have to...i guess i need a vacuum pump to test it and see if it holds a vacuum. Is there a certain place on my carb i need to hook up to? I had a Holley 750 but now run a quadrajet so i get better mileage.

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    Simpsons Did it!! 98formy's Avatar
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    I like the idea of the vacuum pump to see if it holds pressure. If I recall, it has hard plastic lines under the dash for the controls, its possible for those to crack or simply cound have came off the control. The vacuum hose is attached where I would have put it, you could try to put on another one of the smaller ports just for kicks.

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    Member DaddySS's Avatar
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    You should also start with a vacuum gauge and see what you're pulling.

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