LS1 408 cooling Problems
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Teching In
Joined: Dec 2007
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LS1 408 cooling Problems Im running a Ohio forced Induction single turbo kit on my Trans-Am...Its a 408 with tha radiator that comes with tha kit,car seems to be 245 higher.changed out T-stat,water pump but still runs hot.twin 2300 cfm fan r installed.....
Well unless you have some kind of air lock problem I would put in another therm ,maybe the current one is stuck closed. On my 97 talon build had that happen with a brand new factory therm..very annoying! Finally figured it out.
Its easy to see if the t-stat is working. If its stuck closed the needle will go into the red like a windshield wiper. Just start the engine while its dead cold with the radiator cap off, stand there and wait to see if the coolant starts to flow. If it does, the t-stat is opening and the pump is pumping. Should open in about 10-15 minutes. KEEP checking the temp gauge while you wait though so you don't sit there and over heat.
Its just as easy to see if the water pump is working, and they don't really ever stop working, they just blow seals and leak.
You probably don't want to hear this, but the factory stock radiator is hard to beat. If the cooling system is working properly a stock radiator will support some serious power and big cubes. My 427 runs just as cool as when it was stock, even when I romp all over it.
Last edited by LS6427; Oct 28, 2008 at 12:33 AM.
Or its vapor locked. I have to fill the return hose with coolant about 3-4 times before all the air is gone. Pain in the ***. Like stated, if there is air in the system, you'll go hot real quick.
The turbo is also right next to the radiator / AC radiator which can cause heat problems. I think there was a couple of other people that had this problem with this kit
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Thread Starter
Teching In
Joined: Dec 2007
Posts: 11
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Ok.head gaskets r good...Problems is some where else.It cooled a lil better after tha a/c condenser was removed dont know y is that cause a/c conderser is between tha motor and tha radiator not blocking airflow from fan.just took longer to warm up..Im thinking of tryin tha stock radiator & fan just to see...
