ls1 cooling problem - Pirate4x4.Com : 4x4 and Off-Road Forum

crawlerstud · 03-14-2008, 08:40 AM

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?

5540jd · 03-14-2008, 10:30 AM

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?

crawlerstud · 03-14-2008, 11:12 AM

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.

MrWillys · 03-15-2008, 08:31 AM

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.

dragoonranch · 03-15-2008, 09:34 AM

Can you just take the thermostat out? I would try that first and then go from there.

Bansheestu · 03-15-2008, 10:41 PM

If you take the radiator cap off and coolant is cold, you are not getting circulation. It should be basically engine temperature coolant there.

03-14-2008, 08:40 AM	#1 (permalink)
crawlerstud Registered User Join Date: Sep 2005 Member # 52978 Posts: 82	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? __________________ [SIZE="7"]Rest in peace DAVE[/SIZE]

03-14-2008, 10:30 AM	#2 (permalink)
5540jd Registered User Join Date: Jan 2008 Member # 106059 Location: Western Kentucky Posts: 83	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? __________________ 1998 TJ, GM 350TBI, TH350, Dana 300, Dana 60's,5.38's,spooled, linked on 42's 1998 2500 4x4 Chevy, 454, 4L80E, 4.10s, tow rig 2002 Ford Excursion Limited 4X4 7.3L PSD, grocery getter/tow rig Last edited by 5540jd; 03-14-2008 at 10:31 AM.

03-14-2008, 11:12 AM	#3 (permalink)
crawlerstud Registered User Join Date: Sep 2005 Member # 52978 Posts: 82	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. __________________ [SIZE="7"]Rest in peace DAVE[/SIZE]

03-15-2008, 08:31 AM	#4 (permalink)
MrWillys Registered User Join Date: Feb 2002 Member # 9991 Location: Cold Springs, NV Posts: 2,343	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. __________________ [url]www.scotthansen.net[/url]

03-15-2008, 09:34 AM	#5 (permalink)
dragoonranch Rock God Join Date: Mar 2006 Member # 69640 Location: Baghdad-Victory Base Posts: 1,024	Can you just take the thermostat out? I would try that first and then go from there. __________________ Big Ed '78 Chevy Big-30 TTC 2010 here we come! Thanks to all who voted for us, we are gonna put on one hellufa show! Check out our online store. AMSOIL Your last stop for all your Automotive Synthetic Lubricant needs. Please PM me for quotes or questions. Link to places to wheel in Texas

03-15-2008, 10:41 PM	#6 (permalink)
Bansheestu Registered User Join Date: May 2006 Member # 73413 Location: Portland, Oregon Posts: 866	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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