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  1. O

    Moonie to needle cluster swap

    That's a nice setup! I have an 88 with an almost non-functional cluster. Had to run temporary temp, oil, volt cluster. Now fuel guage is bad. Speedo only functioning. Used units pulled from salvage yards don't work either. Bad harness or bad luck with used units. Are there instructions on how...
  2. O

    Need help with a/c and radio stack.

    My 88 K1500 has been torn down a few times to replace AC components, etc. You may have a grounding issues. After last tear down to replace AC evap core, radio sporatically flickers, but of late, it's dead. As long as AC blows cold, I can sing and talk to myself. Now trying to track down slow...
  3. O

    What plug is this? 1988 C1500 Sierra 2wd

    The area I'm referring to is on the DRIVER's side, that goes through the firewall and connects to the fuse bulkhead. Can this not be disconnected? It would explain why I could not get the wires loose.
  4. O

    What plug is this? 1988 C1500 Sierra 2wd

    When I removed the dash to rebuild the HVAC system on my 88, my attempt to de-couple the harness at the firewall was futile. Fear of tearing something loose. Electrolytic corrosion is my guess.
  5. O

    Ol' Blue

    Love Blue Me Too
  6. O

    Strange clicking from passenger side dash area

    I dug up the old recirc actuator (assumption, no part number), took it apart, lubed and tested it w battery. Works. Will tinker w a series connection from HP to LP sensors to see if that gets a signal to the actuator. Any instruction will be appreciated. Still can't figure why Dorman unit...
  7. O

    AC compressor port on back left? Leaking from snap ring - what is it?

    In reference to wiring HP sw to LP sw in series. Please elaborate. Run the HP wire that I grounded to the positive on the positive on the LP switch? I have an 88 that has been converted. I grounded the second wire coming off the HP sw on the back of the compressor and the recirc door would...
  8. O

    Strange clicking from passenger side dash area

    Last year I rebuilt my HVAC system on my 88 truck. It has the old control unit WITHOUT a MAX AC button. Local shop sold me a Dorman actuator that worked for a few months. I got it to work by grounding the second wire coming out of the high pressure sensor on the back of the compressor. Then it...
  9. O

    HVAC control head swap, "Max A/C" Style - Wiring Diagram Needed.

    After a total rebuild of my 88 HVAC system, I was able to get the max/recirc working by grounding the second wire on the pigtail coming off the compressor. As described, it only activates when the fan is set to med, high, and full cold. My new challenge is the HVAC head unit is falling apart...
  10. O

    Why are 88's-98's special?

    Some guy rear ended me some months back. Minor damage. His insurance company declared it 'totaled'. Cost more to fix than book value. I said over someone's dead body will this truck go to the wrecking yard. Body shop agreed w me. He stated the new trucks are junk and won't hold up like the...
  11. O

    Why are 88's-98's special?

    Original owner of an 88 K1500. Daily driver for decades, 350k on original engine, rebuild tranny about every 70-100k. Chronic issues w my rig are door hinges and instrument cluster failure. Buddies keep bugging me to get a new truck, "I deserve it". Why? It does what I need it to do, and I...
  12. O

    AC stopped working

    I did a total rebuild of AC system on my 88 K1500. Instead of the OEM type condensor coil, I installed one from Vintage Air that is designed for the newer gas. Belching out cold air at about 30deg, according to the thermometer in the center vents. It was never that cold even when new.
  13. O

    High pressure A/C switch on a 92?

    BTW, installed a larger condenser coil up front from Vintage Air to work better w new AC coolant. Measured air coming out of center vents at 30deg.
  14. O

    High pressure A/C switch on a 92?

    I just completed total AC rebuild on 88 K1500. The two wire pigtail ties into the pressure switch on the back of the R4. I grounded the unused 2nd end of the pigtail, which now allows the recirculate/max air door to operate for the first time in decades. The pressure switch wire breaks out from...
  15. O

    1990 K1500 a/c repair

    Hello Fellow Old Chv Trk Guys, I'm new to this forum. Did a complete rebuild of AC system all the way through w exception of original control headset in dash. Pulled it apart, cleaned contacts and tested bulbs. Made the ground off second wire coming off back of R4 compressor. (should have...

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