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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; O.K., I just ran into the same problem after installing new cylinder heads. I had a large amount of air ...

  1. #21
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    O.K., I just ran into the same problem after installing new cylinder heads.

    I had a large amount of air trapped in the system and it would not bleed out. I ran the car for about 45 minutes off and on. I would let it cool off and then start it again.

    Finally I got the idea to jack up on the left rear side of the car so that the air could escape. As soon as I did this the air bled out and the temp dropped instantly.

    Give it a try.

  2. #22
    Junior Member ls1_02's Avatar
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    RED
    94' Z28

    Quote Originally Posted by side2000 View Post
    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?
    yes sir I did.... I am really leaning toward a faulty water pump. which sucks b/c changing it is not fun!!!!!

  3. #23
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by ls1_02 View Post
    yes sir I did.... I am really leaning toward a faulty water pump. which sucks b/c changing it is not fun!!!!!
    I highly doubt that the waterpump is bad... this would be the last thing that I try. Waterpumps are very simple parts. When they fail, they leak.

  4. #24
    Member side2000's Avatar
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    red
    2000 camaro ss

    take your cap off radiator before you fire it up and look down in to see if its pumpin

  5. #25
    Member moesplace's Avatar
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    black
    1999 pontiac T/A WS-6

    Some one mention check for obstruction for air flow had a 96 Z28 same problem you have it was a plastic bag on radiator could not see it because of AC coils found it when I went to pull Radiator

  6. #26
    Junior Member ls1_02's Avatar
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    RED
    94' Z28

    Quote Originally Posted by 9t8z28 View Post
    O.K., I just ran into the same problem after installing new cylinder heads.

    I had a large amount of air trapped in the system and it would not bleed out. I ran the car for about 45 minutes off and on. I would let it cool off and then start it again.

    Finally I got the idea to jack up on the left rear side of the car so that the air could escape. As soon as I did this the air bled out and the temp dropped instantly.

    Give it a try.
    really?? Never would have thought of that I'll give it a try and see what happens! did your heater work when it was getting hot? why the left rear side of the car?

  7. #27
    Junior Member ls1_02's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    I highly doubt that the waterpump is bad... this would be the last thing that I try. Waterpumps are very simple parts. When they fail, they leak.
    yea that what I though but I bought a reman from oreillys.. I thought maybe a chance it will fail?

  8. #28
    Junior Member ls1_02's Avatar
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    RED
    94' Z28

    Quote Originally Posted by side2000 View Post
    take your cap off radiator before you fire it up and look down in to see if its pumpin
    I looks to be pumping .

  9. #29
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by ls1_02 View Post
    really?? Never would have thought of that I'll give it a try and see what happens! did your heater work when it was getting hot? why the left rear side of the car?
    No, the heater did not work.

    Because of the design of the system, air gets trapped in the highest places so leveling off such things as the upper radiator hose can solve this.

  10. #30
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by ls1_02 View Post
    yea that what I though but I bought a reman from oreillys.. I thought maybe a chance it will fail?
    When they fail they leak.

  11. #31
    Junior Member ls1_02's Avatar
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    RED
    94' Z28

    Quote Originally Posted by 9t8z28 View Post
    No, the heater did not work.

    Because of the design of the system, air gets trapped in the highest places so leveling off such things as the upper radiator hose can solve this.
    so jack on the passenger side rear of car? as high as I can?

  12. #32
    Junior Member ls1_02's Avatar
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    RED
    94' Z28

    Quote Originally Posted by 9t8z28 View Post
    When they fail they leak.
    ok hopefully you are right.

  13. #33
    Junior Member ls1_02's Avatar
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    RED
    94' Z28

    Quote Originally Posted by ls1_02 View Post
    ok hopefully you are right.
    I sure hope jacking it up fixes the problem!!! it's been a real pita!!

  14. #34
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by ls1_02 View Post
    so jack on the passenger side rear of car? as high as I can?
    No, the driverside.

  15. #35
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by ls1_02 View Post
    I sure hope jacking it up fixes the problem!!! it's been a real pita!!
    Throwing a jack under the car takes 10 minutes vs. 2 hours yanking the pump

  16. #36
    Junior Member ls1_02's Avatar
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    RED
    94' Z28

    Quote Originally Posted by 9t8z28 View Post
    No, the driverside.
    ok thanks.

  17. #37
    Junior Member ls1_02's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    Throwing a jack under the car takes 10 minutes vs. 2 hours yanking the pump
    yea no doubt

  18. #38
    Junior Member ls1_02's Avatar
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    RED
    94' Z28

    I tried jacking up the drivers side rear and the passenger rear... didn't help. I flushed the heater core with both hoses off and with one hose off to back feed the radiator until it over flowed... didn't help still no heater and the car is getting very hot. what else other than a bad waterpump could it be? oreillys told me that 40-50% off the time the reman water pumps come back bad. which leads me to think maybe the it is the waterpump. any more help would be greatly appreciated.

  19. #39
    Junior Member ls1_02's Avatar
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    RED
    94' Z28

    could the optispark be installed incorrectly? it doesn't miss and starts up fine. I don't see how the heat wouldn't work but it's just a thought.

  20. #40
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    red
    2000 camaro ss

    will the car overheat when youre drivin? did you check to make sure both fans were workin? dont flush anymore. that's not the problem and you might create the air pocket problem. when you yanked your thermo---did you have fan on from idle til it overheated? this is important.
    2000 red ss: >2" drop, koni adjustables 'n 275 s-compounds all way around, giant brakes, dynatech LT's, borla catback (no plate), t56, tubular everything, HARD TOP, caged, "stock" heads 'n a mean cam. -2* front camber.

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