LT1-LT4 Modifications 1993-97 Gen II Small Block V8

LT1 Over-heating

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Old 08-14-2008, 12:15 PM
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Angry LT1 Over-heating

new) T-stat, hoses, temp sensor,


But still over-heats if someone could help please contact me at geo_hoffman@yahoo.com
Old 08-14-2008, 12:47 PM
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I had one with a blown head gasket that did the same thing, still sitting in my backyard right now
Old 08-14-2008, 12:54 PM
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Head gasket is fine I had that checked by GM
Old 08-14-2008, 02:25 PM
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Not getting any odd noises from your waterpump are you?
Old 08-14-2008, 03:48 PM
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Fans coming on? When was the last time your radiator was flushed out? Could be clogged?
Old 08-14-2008, 03:52 PM
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radiator can be clogged or water pump issues when my car over heated i changed the radiator and water pump and put the slp manual fan switch
Old 08-14-2008, 03:53 PM
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i used to have an LT1 z28 and it overheated all the time. I took it to the shop and he told me it's because the headers were getting really hot, they weren't coated with anything.
Old 08-14-2008, 04:23 PM
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That is almost retarded.
Old 08-14-2008, 04:28 PM
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If your fans work, I would just buy a new radiator or find someone who can flush it out. I replaced everything in my cooling system to only find out that the mechanic didnt flush out the radiator correctly and i spent a lot of money for nothing. It was apparently stopped up in the middle.
Old 08-14-2008, 04:42 PM
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Originally Posted by ba95z28
i used to have an LT1 z28 and it overheated all the time. I took it to the shop and he told me it's because the headers were getting really hot, they weren't coated with anything.
what in the f are you talking about??? headers will not cause your engine to overheat. in fact headers will take more heat/exhaust out of the engine than stock manifolds. thats why you see a hp increase.... more efficient.
Old 08-14-2008, 04:51 PM
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does it quickly overheat or does it take a few minutes?

if it quickly overheats your water pump may be out. put a long screw driver to the water pump and put your ear on it to see if you can hear the wp spinning. pop off the rad cap and see if coolant is flowing too.

the heater core may be clogged also. its a common failure on lt1s. pull it and check it out. i found a hand full of sand and goo in mine when mine was overheating.
Old 08-14-2008, 06:15 PM
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at idol does ur car shake kinda bad does it overheat quickly at idol or does it only overheat after driving it
Old 08-14-2008, 08:12 PM
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i might be mis understanding but mine did the same thing when new hypertech thermostat was put in. i had to bleed the air out if the cooling system.
Old 08-15-2008, 01:41 PM
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Thx to all that helped me I think the engine blew it won't start this morning
Old 08-15-2008, 02:10 PM
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that sucks if thats true^^^
Old 08-15-2008, 02:44 PM
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check for coolant in the oil.
Old 08-15-2008, 02:58 PM
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how hot did it get ?
Old 08-16-2008, 12:01 AM
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bleed the air out of the system by the two valves in the lines
Old 08-16-2008, 01:57 AM
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Any updates? Interested to see what this actually ended up being....
Old 09-11-2008, 10:33 PM
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I believe it got to 180


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