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Old 03-14-2008, 08:40 AM   #1 (permalink)
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ls1 cooling problem

I have an ls1 in my yota with the radiator in the bed and the motor keeps over heating. At first i thought that it maybe a thermostat so i replaced it. Still had the same problem, so i replaced the surpentine belt because it was slipping. Still didn't work. I don't think that it is the water pump because when you remove the preasure cap on the radiator after it over heats the coolant is cold and is under preasure. I can't figure out what the problem is. Any suggestions?
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Old 03-14-2008, 10:30 AM   #2 (permalink)
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Are you sure about the water pump? Some of those engines had a reverse flow pump. Or if you are turning it backwards, it is just cavitating instead of moving water. Thermostat is in correctly isn't it?
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Old 03-14-2008, 11:12 AM   #3 (permalink)
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Yeha the thermostat is in right because there is on;y one way to put it in because it is built into the housing. I don't think that the surpentine belt is on wrong because the tentioner pulley is level with the top of the water pump pulley so it seems logical to me that the belt run under the water pump and aver the tensioner pulley.
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Old 03-15-2008, 08:31 AM   #4 (permalink)
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I've had a couple LS1 motors.
Do you have 1 square inch of radiator per cubic inch? Is it an early model that could have the bad head gasket problem? I think the early 2000 and prior had this problem.
I had a 2000 SS that would boil over sitting in the driveway after pounding on it. My 04 doesn't do it after beatin on it the same way.
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Old 03-15-2008, 09:34 AM   #5 (permalink)
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Can you just take the thermostat out? I would try that first and then go from there.
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Old 03-15-2008, 10:41 PM   #6 (permalink)
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If you take the radiator cap off and coolant is cold, you are not getting circulation. It should be basically engine temperature coolant there.
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