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  1. M

    temp gauge is all over the place, please HELP!!!!

    No new progress to report. I am chalking it up to the gauge. There are no leaks of any kind. All the related parts have been replaced with brand new. I got a laser temp gauge and it all checks out there as well. So for the time being, I am going to let it be. Thanks to all that tried to help.
  2. M

    temp gauge is all over the place, please HELP!!!!

    Hey Thunderstruck, I definitely have not owned a gmt800, lol. I will check the grounds tomorrow and also look into the mechanical temperature tester. Thanks for the advice.
  3. M

    How do I set the clock?

    Great White, you are the man!
  4. M

    How do I set the clock?

    Dumb question, but I cannot figure out how to set the clock on my 1990 stock radio. It drives me crazy. Any help would be greatly appreciated. Thanks
  5. M

    temp gauge is all over the place, please HELP!!!!

    Hi again fellas, thanks for all the help. The issue is still not resolved. New thermostat, new coolant gauge sender, new coolant temp sensor and new thermostat. All fluids are topped off and bled. Could it actually be the gauge itself? I have never had an issue with gauges on any chevy I...
  6. M

    temp gauge is all over the place, please HELP!!!!

    I have replaced the thermostat and gasket and properly bled the system. Still having the issue. I am going to try the temperature gauge sender now and also do the coolant temp sensor since it is so easy. I am getting pretty frustrated.
  7. M

    temp gauge is all over the place, please HELP!!!!

    Thanks everybody. How do I get air out of the system if it is in there? Also, which way does the thermostat go?
  8. M

    temp gauge is all over the place, please HELP!!!!

    Hi, so I have had this truck for a little over a year now and the heater/cooling system has been a constant problem. I replaced the heater core yesterday and now the temp gauge is acting really weird. It warms up fine, gets to about 200 degrees and stays there when idling. But when I start...
  9. M

    Another heater question for a 1990 truck

    okay, so I put the new radiator cap on. no more leak there. However, now the temp gauge is moving all over the place. It will go from almost to 260 all the way down to alot 100. And still no heat. So just a recap, the radiator is brand new, the radiator cap is brand new, the thermostat is...
  10. M

    Another heater question for a 1990 truck

    Hey everybody, so I am still having issues with my heater. A month or so ago I replaced the radiator and thermostat. I used fail safe thermostat and it never really seemed to function properly, but I was getting some warm air. It never got hot though. A week and a half ago, the belt...
  11. M

    Fail Safe thermostat on 90 RCSB

    So as some of you know, I recently replaced my radiator and thermostat on my truck. I put in a Fail Safe thermostat thinking I was doing a good thing. Everything seemed good for a day or so, but then I noticed that the temp would rise almost to overheating and then drop to just over 100...
  12. M

    1990 rcsb heater question

    Rplaced the radiator and thermostat. Had a bolt sheer in the manifold and eventually drilled it and tapped it for a heli coil. Filled it up with coolant and everything is good to go. No leaks and constant hot air. Thanks for all the advice.
  13. M

    How to Replace Blower Motor Resistor

    Finally got everything put back together. Ended up using a heli coil for the one I had to drill out. everything is good to go now. No leaks. Brand new thermostat, brand new radiator and all new fluid. Im a happy camper.
  14. M

    How to Replace Blower Motor Resistor

    D the radiator today. $130 from autozone. Then went to do the thermostat and one of the bolts broke in the manifold. DAMN! I drilled the bolt and went at it with an easy out, but then the easy out sheered off as well. WTF?! Spent hours trying to drill the easy out with very little success...
  15. M

    1990 rcsb heater question

    Tnks guys, I noticed a leak in my radiator this evening as well. I will update this weekend after I get time really look at it.
  16. M

    How to Replace Blower Motor Resistor

  17. M

    How to Replace Blower Motor Resistor

    Just got home and as I was getting out of the truck I noticed a hissing sound. Popped the hood and discovered the radiator has a leak. I can't see exactly where the leak is, but it seems to be between the upper radiator hose and the grill. I could see the steam and hear the hissing. So I...
  18. M

    How to Replace Blower Motor Resistor

    I will try flushing the radiator and replacing the thermostat this weekend. I just got the truck last weekend. Thanks for the tip.
  19. M

    1990 rcsb heater question

    Hello, I am having heater issues. The problem I am having is that the heater rarely puts out any heat. The blower works at all 3 speeds. The button to adjust the temp appears to work, according to the display (the arrow moves back and forth when I push the button towards hot or cold) but does...
  20. M

    How to Replace Blower Motor Resistor

    Hello everybody, I have a 1990 scsb and the heater only blows warm air some of the time. It will blow warm fo longer on the low setting than on the medium or high setting. On the high setting I can actually feel the warm air go from warm to cold. The motor blows and adjusts speeds...
  21. M

    Battery only showing 10 volts

    Hey Mobs, do I need to take the alternator apart to access it? I am not seeing anything externally.
  22. M

    Battery only showing 10 volts

    Tempted, I just got back from having the alternator tested. It passed. I picked up a replacement voltage regulator, just on a hunch, but I have no idea where it goes. Is it actually built into the alternator? Is it external? Tempted, yes, the gauge fluctuates when I turn accessories on. It...
  23. M

    Battery only showing 10 volts

    Tempted, thanks. That totally clears everything up. I am going to take the alternator off and go have it tested. Do these trucks have a voltage regulator? Because I think it's odd that the voltmeter on the battery shows the battery is good and the voltmeter on the alternator shows it is...
  24. M

    Battery only showing 10 volts

    Hey Tempted, could you clarify all of the abreviations for me? I am not really sure what you are telling me. Thanks for your help, I really appreciate it.
  25. M

    Battery only showing 10 volts

    okay, I just put the voltmeter on the battery while running, registered 13.8. Alternator was registering 14.2 while idling. I don't know the idle speed, there is no tach in my truck. Once again, I want to say thanks for all of this help. Should I just take the alternator off and go have it...

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