overheat after new gasket install.

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zenkizen
Posts: 30
Joined: Wed Oct 03, 2007 5:57 pm
Car: S14 Zenki

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so my turbo was hella loose, so i took out the exhaust manifold and turbo unit.

i installed all new gaskets and reinstalled everything. i also flushed the radiator fluid and gave her an oil change.

while warming up the car, everything seemed fine. until i drove down the street.

the car started over heating. i blasted the heater but only cold air came out. i popped the hood and squeezed the radiator hose and there was normal pressure and doesn't seem to be leaking.

i'm guessing its the thermostat but just wanted to see what you think.


User avatar
zenkizen
Posts: 30
Joined: Wed Oct 03, 2007 5:57 pm
Car: S14 Zenki

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also, which theremostat and thermostat temp can i use?


exhsturbine
Posts: 128
Joined: Sun Jun 08, 2008 4:33 pm
Car: 1997 240
Location: Miramar, San Diego, California

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okay, was it overheating before you swapped the gasket? if it wasnt then, most likely the thermostat is ok, but i have seen more than a few coincidences while working on vehicles. now you say that you flushed your coolant, did you bleed the system properly after adding fluid? if you say that only cold air comes out of the heater that would mean to me that there is no hot fluid reaching your heater core. now i suppose by some stange circumstance that you may have gotten something clogged in your cooling system, but i doubt it. when the swap took place did you replace the dash coolant sensor with usdm? alot of times this is forgotten and owners freak out when the gauge goes to the top when the motor is relatively within the correct operating temperature. so...let the car warm up and then check the upper radiator hose to see if its hot. if not then i would imagine no fluid is circulating, which could be the cause of a bad thermostat or an improperly bled coolant system. first (so that no precious coolant is wasted) i would make sure the system is bled by jacking up the front of the car a bit then letting the car idle with the bleeder screw on the upper coolant neck loosened. when coolant begins to come out, top off fluid and close screw. if overheating still occurs, and you still suspect failed thermostat, ensure that its installed correctly and if it is, test it by placing it in water. oem therms open at 170*F if i remember right. so boil water check with gauge and wait for it to open. if bad replace it and then continue to bleed system and replace coolant again. i have heard some complaints about therms that open earlier. i however found that it had helped my motor. sorry for the long post but i hope that it helps.


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