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Lt1 Getting hot

This is a discussion on Lt1 Getting hot within the LT1 forums, part of the Vehicle Specific category; I changed my plugs, wires, optispark, thermostat and water pump out recently. Ever since then it has been running hot. ...

  1. #1
    Junior Member ls1_02's Avatar
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    94' Z28

    Lt1 Getting hot

    I changed my plugs, wires, optispark, thermostat and water pump out recently. Ever since then it has been running hot. I bled the system completley(I think) and for some reason the heater still doesnt get hot, but there car is running about 240-250 degreees just Idling with the fans on high Is the heater core clogged up or something b/c I can't see a leak at all. Like I said I believe I bled the system completely but It acts like there may be an air pocket still in the system. any help would be greatly appreciated.

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    Senior Member ss~zoso~ss's Avatar
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    sounds like maybe something wrong with the thermo?
    put in wrong?
    defect part?

  3. #3
    Junior Member ls1_02's Avatar
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    I took out the thermostat and it still got hot, and it was in correctly. it looks like water is making it to the heater core but why woudn't the heater get got?

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    I flame retards CamaroFan71's Avatar
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    Check in between the radiator/ac condensor for trash build up. Real bad problem with these cars.

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    Life in the Fast lane sunsetorangess's Avatar
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    Your guage is reading 240 but you dont have heat.. Are you sure your guage is correct?
    Does sound like an air pocket.. May want to try bleeding it once again.
    J
    2001 SS, Its not the car its the Driver that matters....

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Did you pull the bleeder valve on the top hose.

    Is the top hose hot? Is it soft or holding pressure?

    With the cap off and the car is at or above opperating temperature, look into the radiator. Do you see the water flowing?

  7. #7
    Junior Member ls1_02's Avatar
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    Quote Originally Posted by CamaroFan71 View Post
    Check in between the radiator/ac condensor for trash build up. Real bad problem with these cars.
    ok I will check

  8. #8
    Junior Member ls1_02's Avatar
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    Quote Originally Posted by sunsetorangess View Post
    Your guage is reading 240 but you dont have heat.. Are you sure your guage is correct?
    Does sound like an air pocket.. May want to try bleeding it once again.
    J
    I tested the temp of the water in the radiator, when the gauge was at 220-230 degrees. the reading was about 200-210 degrees or so. it is probably a pretty accurate reading.

  9. #9
    Junior Member ls1_02's Avatar
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    Quote Originally Posted by sunsetorangess View Post
    Your guage is reading 240 but you dont have heat.. Are you sure your guage is correct?
    Does sound like an air pocket.. May want to try bleeding it once again.
    J
    I think I will buy the kit to install a hose connection on the heater hose and try to flush out the system that way, has any one had good results doing this?

  10. #10
    Junior Member ls1_02's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    Did you pull the bleeder valve on the top hose.

    Is the top hose hot? Is it soft or holding pressure?

    With the cap off and the car is at or above opperating temperature, look into the radiator. Do you see the water flowing?
    the water appears to be circulating but I can't tell how well. all the hoses are warm.they seem to be kinda soft, once it gets up to temp with the cap off it will come out the radiator a bit, is that normal?
    Last edited by ls1_02; 10-29-2008 at 05:36 AM.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by ls1_02 View Post
    the water appears to be circulating but I can't tell how well. all the hoses are warm.they seem to be kinda soft, once it gets up to temp with the cap off it will come out the radiator a bit, is that normal?
    Did you see the bleeder that I was referring to? LT1's have it but LS1's don't

  12. #12
    Junior Member ls1_02's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    Did you see the bleeder that I was referring to? LT1's have it but LS1's don't
    the two bleeders, one near the water neck and the one on the 5/8" hose, where does this one go? the one but the water neck bleeds completely, the other bleeder seems to only bleed by pressure when the car gets real hot.

  13. #13
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by ls1_02 View Post
    the two bleeders, one near the water neck and the one on the 5/8" hose, where does this one go? the one but the water neck bleeds completely, the other bleeder seems to only bleed by pressure when the car gets real hot.
    I can't remember where it goes but you should have some fluid come out of it.

  14. #14
    Junior Member ls1_02's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    I can't remember where it goes but you should have some fluid come out of it.
    it doesn't come out that bleeder until it is hot. is that normal?

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    Senior Member bigrondownhiller's Avatar
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    Let it circulate a bit and hit those bleeders a few times. There is a procedure in the service manual for doing it. Was the heater working before the work? My heater core did plug up and had it replaced. The first time I just reverse flushed the heater core to get the junk out.

  16. #16
    Junior Member ls1_02's Avatar
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    Quote Originally Posted by bigrondownhiller View Post
    Let it circulate a bit and hit those bleeders a few times. There is a procedure in the service manual for doing it. Was the heater working before the work? My heater core did plug up and had it replaced. The first time I just reverse flushed the heater core to get the junk out.
    I'm not sure if it worked or not, I haven't drove the car in 2 years... I may need to replace the heater core.

  17. #17
    Junior Member ls1_02's Avatar
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    bled the system again, and flushed the system with that cheap kit from autozone, no trash between the radiator and condenser...still gettin hot. I think I will bypass the heater core and see what that does if that doesn't work I will be taking the water pump back to oreilly's and giving another one a try.

  18. #18
    Member side2000's Avatar
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    are your fans kickin on?

  19. #19
    Junior Member ls1_02's Avatar
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    Quote Originally Posted by side2000 View Post
    are your fans kickin on?
    they do but I have installed a manual switch to turn them on whenever and it still gets hot when the fans are on high and idling.

  20. #20
    Member side2000's Avatar
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    wow there is no way you should be runnin that hot. what thermo did you get? takin thermo out is not necessarily a good test because it WILL get hot...but that's with stock fans...since you can turn your fans on-did you have fans on whole time when you had thermo out?
    Last edited by side2000; 11-02-2008 at 07:57 AM.

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