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Oldsmobile Forum: A/C Vacuum loss
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Old May 19th, 2015
GA_Boy1 GA_Boy1 is offline
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Question A/C Vacuum loss

Hello once again, 1995 Cutlass Supreme, Small V6 engine.
When I depress the accelerator with the A/C on I guess it's a vacuum loss because the air stops coming from the dash vents and Defaults (I guess) to the floor vents. Do canisters go bad? Maybe a vac. hose? I'm at a loss as to troubleshooting.
Thanks for your suggestions.
Marvin
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Old December 7th, 2018
woodyBR549 woodyBR549 is offline
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I know this is an old thread but... I've seen the same issue over and over. Yes, it is vacuum related. The tricky part is finding the leak. First rule is "rubber hoses and seals" if your fingers turn black just from touching the hose, it's probably bad and leaking. If the hose is hard as a rock, again its probably bad and leaking. Check the big stuff first, like the plastic tube connections at the PCV valve, top of and just behind the throttle body where it connects to the upper intake, from there it continues down and behind the coils to the egr/evap control valves. These lines are notorious for cracking and bad rubber seals where they connect. Just check every vacuum line attached to the upper intake to wherever they end. Check the vacuum reservoir ball behind the left front fender, behind and below the headlight. Check the evap canister and its hoses(its behind the left rear tire, up in the fender) Could also be a bad vacuum motor. There are three behind the glovebox. Also back there is the BCM, Blower motor, 3 or 4 relays and the remote module"maybe". Most remote modules are under the rear deck on the pass side, behind the speaker. Also, if the evap system has a vacuum leak, the "service engine soon" light will come on. If the intake gaskets are leaking you would have other issue's as well.
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