1997 Olds Cutlass Wont change to vents - AC Auto Repair Help Forum


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1997 Olds Cutlass Wont change to vents

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kevhays01
New User

Nov 21, 2011, 12:15 PM

Post #1 of 3 (2388 views)

1997 Olds Cutlass Wont change to vents	Sign In

I have a 1997 Oldsmobile Cutlass that will not change from the top and bottom to the vents on the air and heat. Any suggestions?

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 21, 2011, 12:29 PM

Post #2 of 3 (2381 views)

Re: 1997 Olds Cutlass Wont change to vents	Sign In

The mode selection is done through a series of air doors that are operated by vacuum. When there is either a partial or total loss of vacuum, the system will default to either defrost or on some vehicles, heat. Acceleration can also have an effect on the doors for the same reason.

Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

kevhays01
New User

Nov 21, 2011, 12:32 PM

Post #3 of 3 (2376 views)

Re: 1997 Olds Cutlass Wont change to vents	Sign In

Thanks, Someone said they thought it was the switch but this makes more sense.

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