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Help with ac vents


W30olds
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My 95 SE only blows on defrost mode now for some reason. Floor and defrost but not from the center vents. I'm assuming it's a vacuum leak somewhere. If any of yo u guys could steer me on where to check I'd really appreciate it. Sucks not having cool air from the center vents. Feet are good and cold though! Thanks in advance!

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Check the vacuum lines that lead to the vacuum ball down in the fender where the battery is. That lead comes from a line from behind the intake plenum. It may be cracked. If any other vac lines are cracked it will cause the air to go only defrost and feet

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Wow! Good catch Nas, I would have thought vacuum line not that far off in the system. A 4T60 will usually shift hard if that line is cracked.

 

In my experience, the trans only shifts hard when the specific metal line that goes to the trans from the intake plenum is disconnected on either side. Any other major vac leak that involves the plenum also affects the trans, if you even get the engine to run at all since the only thing bigger than that line is the MAP itself, but those small vac lines that control the A/C, cruise control (not applicable on 94+) don't really affect the trans. It's not a big enough leak.

 

My mileage is 60 degree v6 specific, it may be different on the 3800.

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My mileage is 60 degree v6 specific, it may be different on the 3800.

 

Maybe, when I first got my Regal it had it's native L36 / 4T60 and got into gear a little firmly and I remembered as kids when we "accidentally" did a TH350 3RD stage shift kit (supposed to be 2ND) how it hammered into gear. The only difference was limiting or removing the vacuum to the modulator so I went looking for the leak and it was right at the TB. It shifted better but was still too firm until I found the vacuum ball had a cracked nipple and eliminated it. Then it shifted fine for a while until 4th gear and TCC quit working.

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