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Hello,
I am having the classic vacumn problem on my mint 88 760. (99K) Gun it good and the a/c stops blowing thru the vents, let off it comes back.
Now.. on a long trip I tried the 700 facts option of closing off the line nearest the driver side on the vacumn dash pot, supposed to kill air to the floor, this did nothing on a 400 mile trip.
I have changed both white and black line vacumn switches at the manifold and tied off the rubber hoses for a good fit.
Here is my suspicion!!! I took a Mighty Vac and pulled vacumn on the white line, it took a lot of pumping (must be the vac resovoir) but it finally stopped and held at 25 pounds. The black line never did stop...I pumped and pumped and the vacumn never pulled, leading me to believe whatever this line goes to is not hooked up or is broke. In addition I put both of the b/w line switches on the M/V too, to make sure they were holding vacumn. OK!
What about the electronic vacumn control circuit board under the glove box?
If this is not conducting perfectly could it cause the same problem? I had to have it soldered once. The problem then was that you would be driving along and the air to the vents would shut off at normal street cruising speed.
Anybody got a hint??
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