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Old 04-14-2013, 10:48 AM   #1
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Air Check Valve location on 1991 Pontiac 6000?


Good Morning!

I hope everybody is having a good weekend. I need to replace the vacuum air check valve on my 1991 pontiac 6000 LE, but haven't been able to locate the darn thing. The motor is the 3.1l v6. When I accelerate, especially uphill, I lose enough vacuum that my a/c controls switch back to defrost, so I'm pretty confident the check valve is the issue.

Here's the part:

This car is basically the same as the Chevrolet Celebrity, Buick Century, and Olds Cutlass Ciera from the same genre. I'm leaving on a trip this afternoon in this car, so any help locating this would be greatly appreciated.

Thanks!!

Patriot_RAM

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Old 04-14-2013, 11:07 AM   #2
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Air Check Valve location on 1991 Pontiac 6000?


Try following the vacuum line from the power brake booster. Should be somewhere on the intake manifold.

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Old 04-14-2013, 11:37 AM   #3
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Air Check Valve location on 1991 Pontiac 6000?


Thanks for the quick reply. That vacuum line does have a check valve on it where it connects to the brake booster. It's a smaller, 90 degree valve. I removed it and did a quick blow test and that one seems to work properly. The other end of that vacuum line connects directly to the intake near the top.

I still cannot locate the one in the photo above. I checked NAPA, O'Reilly, and Auto Zone part searches and 3 out of 3 of them indicated the part above is correct. Do you know where there might be another, larger check valve somewhere in the system?

Thanks!

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