Air Check Valve location on 1991 Pontiac 6000?
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: http://partimages.genpt.com/partimages/95160.jpg
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.
Try following the vacuum line from the power brake booster. Should be somewhere on the intake manifold.
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?
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