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  1. G

    99 Tahoe AC Head Scratcher

    I have added a small charge to the system, it took it from 35 to 40 PSI. Also, shorting the low pressure switch wires on the rear of the compressor does not kick in the clutch, but shorting the wires for the cycling switch does kick in the clutch. I may be wrong, but it seems to me that if the...
  2. G

    99 Tahoe AC Head Scratcher

    Thanks for the response. Because the wires for the cycling switch have voltage and ground, and shorting them makes the compressor clutch operate, doesn’t that mean that the control panel is working and either the switch or pressure to operate it are the issue? Am I just missing something?
  3. G

    99 Tahoe AC Head Scratcher

    As a PS, the relays have good voltage also and I traded relays to verify that the AC relay operates properly.
  4. G

    99 Tahoe AC Head Scratcher

    Our 99 Tahoe had good working air conditioning last year when we quit using AC in the fall, and this spring the AC will not get cold. It seems to be about the exterior air temp. I investigated, found that the system has 40 lbs of pressure without the compressor running, and the high pressure...

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