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Overheating ls1

This is a discussion on Overheating ls1 within the General Help forums, part of the LSx Technical Help Section category; Just replaced my waterpump and radiator and my car is still overheating, when i stop antifreeze spits out of the ...

  1. #1
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    Midnight Blue
    1999 Camaro Z28

    Overheating ls1

    Just replaced my waterpump and radiator and my car is still overheating, when i stop antifreeze spits out of the jug cap... anyone have a clue whats going on?

  2. #2
    Life in the Fast lane sunsetorangess's Avatar
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    Did you bleed the air out? I would start with a new Rad cap and you may have to check the thermostat.
    J
    2001 SS, Its not the car its the Driver that matters....

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    Senior Member JaycenK's Avatar
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    Pressure bleed it. The engines in these cars sit so level with the radiator that unless you jack the front way up or pressure bleed it the air will not come out.

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    Pewter
    2000 Trans Am

    just remove the line that goes to the TB before you fill up the radiator with antifreeze, pour AF and as soon as the fluid starts comming out of the line connect it back. turn on engine and leave the cap open when you start the engine. once the thermostat opens if the block had air in it, it will bubble and the fluid level will lower down, so top off till it sits level for a while.

  5. #5
    F BODYS RULE maxwax's Avatar
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    I am assuming you did put in a new thermostat, if not that could be the problem, my car would overheat at extend range in speeds over 70ish, but would run around 210 at 55 mph , the problem was a piece if rubber from the inside of the thermostat that had actually came apart and had stuck in the thermostat itself and caused it to not work properly.

  6. #6
    Member Goldcuffs's Avatar
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    Does it overheat at highway speeds or just when stopped?

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    Retired NOT tired SteveC's Avatar
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    2001 Z28 (Sara)

    Thumbs up

    Quote Originally Posted by maxwax View Post
    I am assuming you did put in a new thermostat, if not that could be the problem, my car would overheat at extend range in speeds over 70ish, but would run around 210 at 55 mph , the problem was a piece if rubber from the inside of the thermostat that had actually came apart and had stuck in the thermostat itself and caused it to not work properly.
    I agree, an old corroded thermostat could be stuck closed, replace it with a "fail safe" thermo, if they fail, they will stick in the OPEN position.

    SteveC

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    Military Muscle :usa: MYSCZ06's Avatar
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    blown head gasket?

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    Stockitie Stock Stock 95camaroZNC's Avatar
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    When you put everything back were you careful and avoided putting the radiator back in ontop of the wiring harness for the fans, are the fans coming on? This is the problem i had when i replaced the radiator because my dumb ass numb skull friend who supposedly helped restore the 65 mustang he drives sat it right ontop of it and burned it out.

    If thats not it, thermostat for sure inless you have blown the head gasket driving it hot.

  10. #10
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    Midnight Blue
    1999 Camaro Z28

    ..

    yes the fans are coming on but not until in hits 220 dergees

  11. #11
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    Start it up and monitor the temp of your radiator hoses. Whatever your thermostat is rated for, the hoses should start to warm up a little above that temp and within a few minutes should be hot.

    If the thermostat is stuck closed, or is not opening all the way, the hoses will not get hot. Shut it down as you have either a bad stat or the cooling system is airlocked.

  12. #12
    11's "CLUB" SS SLP2's Avatar
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    Quote Originally Posted by SVG210 View Post
    just remove the line that goes to the TB before you fill up the radiator with antifreeze, pour AF and as soon as the fluid starts comming out of the line connect it back. turn on engine and leave the cap open when you start the engine. once the thermostat opens if the block had air in it, it will bubble and the fluid level will lower down, so top off till it sits level for a while.
    X2

    blead the air
    Johnny

  13. #13
    Member Bandit1's Avatar
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    when i bleed my radiator with the cap off after a little bit it starts to over flow and than shoot out like a gyser. any thoughts? i am as well having a slight overheating problem.

  14. #14
    Smiles for 9.5 Years cammed goat's Avatar
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    Quote Originally Posted by Bandit1 View Post
    when i bleed my radiator with the cap off after a little bit it starts to over flow and than shoot out like a gyser. any thoughts? i am as well having a slight overheating problem.
    How many times have ya bled the system?

  15. #15
    Member Bandit1's Avatar
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    tried to do it 2x and get some bubbles everytime till it blows out

  16. #16
    Smiles for 9.5 Years cammed goat's Avatar
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    Quote Originally Posted by Bandit1 View Post
    tried to do it 2x and get some bubbles everytime till it blows out
    What else have you done to yours? Have you ever flushed your system?

  17. #17
    Member Bandit1's Avatar
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    had the water pump replaced bout a year ago but didnt have the problem till last night.
    the temp gauge went up right before the red so i shut it down figured it sucked an air pocket from some where

  18. #18
    Member Bandit1's Avatar
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    is there a way to test the relays? i suspect the fans r not working.

  19. #19
    Smiles for 9.5 Years cammed goat's Avatar
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    Quote Originally Posted by Bandit1 View Post
    is there a way to test the relays? i suspect the fans r not working.
    Do you have a power probe? It's a tester with a wire that runs off 12 volts to run power to a harness to see if there is power going to an accessory. That way, you could "jump" the fans to see if they are running without the car on.

  20. #20
    Member Bandit1's Avatar
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    i dont have a power probe, i do have a volt meter.

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