Question about 1988 Oldsmobile Delta 88

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Dash vents 1985 heat

Cannot find vacuum lines

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Lots of older cars, especially ones without air conditioning, didn't use vacuum controls, but used cables and levers.
If you do have vacuum lines, will have one from engine's intake manifold going through the firewall and into the back of the control panel to a pod-like device that distributes vacuum to several controllers on the heater/AC case under the dash. Several vacuum lines exit the control panel, each goes to a small diaphragm tank or canister next to the door it operates.

Posted on Jul 17, 2013

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1 Answer

Vacuum vent control


You will need to look at the area behind the dash to see if a line was left unhooked at the control panel for the a/c defroster selector. If as you said, a line was burned, you will need to find it further back behind the dash and replace it. An unhooked line will need to be reattached to a small device that may look like a bellows. The are back there is tight but if you had work done, you hopefully still have it open from the front. Any parts store can sell you the vacuum line you will need for this fix. Good luck.

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It's most likely a vacuum line, look under your hood (close to the cowl panel) for a disconnected, cracked or broken vacuum line.

In some rear cases, it could be the vacuum switch (in dash). Or vacuum diaphragm (under dash).

Hope this helps you ???

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1 Answer

Heat and a/c only blows from defroster vent


It's most likely a vacuum line, look under your hood (close to the cowl panel) for a disconnected, cracked or broken vacuum line.

In some rear cases, it could be the vacuum switch (in dash). Or vacuum diaphragm (under dash).

Hope this helps you ???

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There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

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Check under your hood for broken or loose vacuum lines. Also, the pot on the hood? i believe, on that one. There should be avacuum line running to it. Looks like a little bowling ball. With your engine running , listen for a hissing.

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The most common problem that causes this is a bad temp control, the actual selector module in the dash of the car. Try replacing this.

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The baffles that direct air, heated or cooled, are controlled by vacuum 'motors.'
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1 Answer

Air not blowing out top dash vents


Just posted my suspicions elsewhere:

The baffles that direct air, heated or cooled, are controlled by vacuum 'motors.'
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Aug 03, 2008 | 1996 GMC Sonoma

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