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Originally Posted by Johnhef
Unless I missed something, since this is an 85, has anyone suggested swapping out the klima relay? I have a spare, but I forgot what was wrong with the car it came out of.
On the other hand, I had a similar problem in winter with my 82, only blowing heat on full clicked position. My problem was the climate unit itself. I still have no auto speeds between high and low but I believe that should be the regulator box.
Anyone know which box is which? Black or Silver? I may swap them out this weekend.
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If the Klima is bad, you won't get the compressor to engage, independent of what you do with the PBU. This is also true if any of the signals received by the Klima are not to spec. A perfectly good Klima will fail to start the compressor if all input signals are not proper.
It's definitely a PBU situation. Might be the PBU itself. Might be one of the thermistors that feed the PBU. I am presuming the monovalve is OK.