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  1. chengny

    Ignition issue, no spark

    If everything else is working normally, a good place to start is at the HEI distributor. With the ignition switch in the RUN position, verify 12 volts available to the BATT terminal on the pink lead. If you find that power is available there, suspect a distributor issue. If there is no power to...
  2. chengny

    Help with instrument cluster - 77 K10

    I would stick with the 25044897 circuit. The connectors for the 77 and the 81-84 are not compatible. There do not even use the same number of tabs. That and the fact that the circuit for the 81 - 84 shows as correct (see below): To revert back to the 77 harness would require some serious...
  3. chengny

    Horn not working

    File the post above under too little too late.
  4. chengny

    Horn not working

    The power supply to the horns doesn't pass through the switch in the steering wheel. Operation of the horns is controlled by the horn relay. Pressing the horn button just creates a path to ground for the relay's coil. That causes the coil to pull in and close the contacts on the power side of...
  5. chengny

    Help with instrument cluster - 77 K10

    It looks like that bucket (case) shown in the link is part number 25051838. That P/N shows as used in the C/K 1,2 & 3 series for model years 1983 & 84. It appears to accept printed circuit with P/N 25044897 (C/K 1, 2 &3 without tach). The only thing that doesn't seem correct is that it is...
  6. chengny

    Radio powers on no sound

    Me too. And I apologize for being so negative.
  7. chengny

    Window Gutter Trim 86 K10 Siverado

    X2 - requires a 1/4" wrench IIRC.
  8. chengny

    Radio powers on no sound

    Hmm..let's see. You have a JVC head unit that has performed well for 8 years. But now, suddenly, there is no output from any of the speakers. You didn't mention whether everything else still worked, so if I had to guess, I'd say the H/U was NFG.
  9. chengny

    Interchangeable ac system

    First step is to find the leak. Add some gas to pressurize the system and then listen, feel or use soap suds to identify the location of the leak.
  10. chengny

    Wiring for blower motor

    Some of this might help:
  11. chengny

    Help putting ignition lock back in

    Here is the factory procedure from the 1985 Service Manual. Seems that the cylinder must be removed in the RUN position:
  12. chengny

    excessive heat coming from firewall: help please

    IDK - maybe try popping the grommet out of the case and (if the nipple is accessible below the hole) attempt to attach a piece of vacuum hose to it using a small pair of needle nose pliers. Use a piece of hose that is longer than required. Pass the other end through the grommet, and pop it back...
  13. chengny

    excessive heat coming from firewall: help please

    That vacuum line (that you circled in red) pulls the HEAT/AC actuator to the HEAT position. There is another line that pulls the same actuator into the A/C position. The actuator is mounted to the outside of the air handling case on the front side - between the case and firewall. In 1986 and up...
  14. chengny

    excessive heat coming from firewall: help please

  15. chengny

    Single wire temperature sensor versus two wire sensor

    Yeah, I was pretty sure it could be done...but I didn't want to confuse the issue
  16. chengny

    Single wire temperature sensor versus two wire sensor

    Did you miss this: Don't even try to use that coolant temp sensor. Coolant sensors with two leads are used to provide coolant temperature to the ECM. It won't drive your dash temp gauge.
  17. chengny

    1985 K-10 knock sensor

    Don't even try to use that coolant temp sensor. Coolant sensors with two leads are used to provide coolant temperature to the ECM. It won't drive your dash temp gauge.
  18. chengny

    excessive heat coming from firewall: help please

    1. The actuator arm on the blend door looks broken. It is - broken. Classic Parts has them in stock for $4.49: https://www.classicparts.com/1971-87-Diverter-Valve-Link-Connector-W-A_C/productinfo/68-248/ But, that flap you are looking at isn't the "blend door" that everyone has been...
  19. chengny

    rear brake pipe fitting spec

    Is 7/16 - 24 to small - if so try a 9/16 - 18. You may be dealing with a "Master Cylinder" fitting. See below:
  20. chengny

    excessive heat coming from firewall: help please

    This is correct: your saying that that moving the temp lever to "cold" should shut the air diverter flap away from the heater core...regardless if the AC is functioning? This is not: so if I set it to MAX AC, the blend door will close? The blend door is connected to the temperature lever by...
  21. chengny

    excessive heat coming from firewall: help please

    Before going through that procedure, try this. Stick your head under the dash in the area of the blend door: While you are listening, have an assistant vigorously stroke the temperature lever from full hot to full cold. If the door is making contact at both ends, you should hear an audible...
  22. chengny

    1985 K-10 knock sensor

    In 1985 the LE9 (5.0) engine came equipped with an ESC system - it was the only one that had it. My question is should the end of the sensor where the wire connects be able to completely rotate? The knock sensor in an engine is used to send signals to the engine-control computer if this action...
  23. chengny

    excessive heat coming from firewall: help please

    These C60 AC systems are referred to as the reheat type. The air that is to be supplied to the cabin (whether from the recirc duct or from the outside) is drawn into the fan suction. Total output is then discharged through the evaporator coil. See the image below. If the mode select lever is...
  24. chengny

    GMC hood emblem.

    They are out there but they are real pricey. This guy has one (NOS) listed for $199. But he will accept offers: It is gm part 14032782 and was used from 81-91. All C/K 1,2 & 3 used the same part - no special emblem for the 06 (Jimmy, Blazer, Suburban, etc.) series...
  25. chengny

    Decode block number????

    Correct. That code indicates that the engine was manufactured in the Tonawanda plant on April 12th 1973.

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