my LT1 is overheating again....only when i beat the **** outa it though....i can leave it running for 6 1/2 hrs w/o turning it off(sometimes i have to for my job) and it wont overheat. Only when i go out having fun with it does it do it(beat the **** outa it). i changed the waterpump(due to splines on the coupling being worn), thermostat, replaced all hoses and checked the radiator out and its not plugged....i am bout ready to give up on the car due to all the problems i've been having with it....

 

have you had the sys flushed?
maybe its clogged just enough to were when you drive it normal its fine....but after high rpms and heat, it doesnt have enough circulation to keep cool?

 

yea i flushed it twice...

 

the radiator also?
man.. heater core clogged?
both fans working?

 

yea the heatercore is bypassed....and yes one fan is on most of the time and the 2nd one kicks in when it gets hot and when a/c is on

 

when was the heater core bypassed and y?
and when did the problem start happening? after a mod or anything?

 

yea i know its a wierd problem i might just sell the car as my intro into f-bodies has not been good(fun to drive but can't handle any abuse or atleast mine cant)

 

nah the person(the original owner) did it and its been an on goin problem for a couple months now on and off

 

had an 05 cobalt with some mods and a 70 chevelle ss 454 that took abuse and performed well but this t/a.....cant take it

 

look and see if the black part is there. underneath the car. it rubs when pulling up on curbs and ****. if that thing is gone theres no way it can get enough air.
is there anything restricting the rad?

 

nope even have papers for it, it was bought about a year ago, and i've tested it twice..(ive tested things twice cause i cant belive its still overheating after all that i;ve done)

 

never heard of something like that. idk man
anyone else?lol

 

is it only at high speeds? check the air dam under your car...

 

thats what i was trying to get out.lmao didnt know what to call it.
ive seen cars overheat from that thing being ripped off due to curbs

 

yep. if you dont have that you lose a lot of air flow at highway speeds.

 

well i mean i travled 104miles on the turnpike each day for work at about 80mph and nothin.....just when i accelerate hard or just got have fun in the parking lot.....

 

but yes i know what u mean and yes its in tact(few scrapes but nothin serious)

 

something is wrong with the car, cause even in phoenix, after beating on my car the heat rises a little but never over 205. maybe try getting an aftermarket tune to have the fans turn on sooner, and what temp thermostat are you running and what area of the country do you live in?

 

i live in miami florida and i have the stock 180 therm in it(i had a 160 in it but it still overheated) what i am wondering if its possible that the splines on the waterpump shaft(the shaft in the block) could be worn just enough that when i rev the motor high it doesnt move the waterpump as needed. i mean i dunno just a thought....at this point im all outa ideas...

 

I went through the same situation and a new waterpump took care of it for me. I took apart the old one and the new one to see if there was a difference in the blades and the old one was corroded bad. I could def see why it wouldn't pump like a new one. Hope that helps.