Thread: over heating

ok my car is being stupid and im getting really frustrated. it keeps over heating and i can't find the reason why. i recently changed the fans with some thin fans and also made a new fan shroud. i also changed the radiator. i've bled the system like a million times for air, checked to make sure the t-stat is working. the fans come on when they are supposed to, i also have the coolent checked for hydrocarbons at a local shop. i never see any bubbles coming out of the rad cap. everything checks out. i checked compression and all four are exactly the same. the fans i chose flow plenty of air, 1000cfm each. i don't understand why it keeps getting hot. only thing i can think of is that everything is too close to the turbo but even that seems like it's not the problem, cuz the car was running fine before. all my problems started after i put in my fmic, which i had to change the fan setup because of fitment issues. if any of you guys have had this problem or have some tips for me i would really appriciate it. thanks

faulty sending unit maybe?

well the fans kick on when they should. i had this problem before with my mr2 turbo. it would push coolent out of the rad cap under boost. had the head checked and it was good. put a new gasket and still the same problem. it would only leak under boost. i finally figured out that it was a crack in the block and would only leak under boost. but that's not the case here cuz im not getting coolent out of the cap, until it gets hot.

i cant fully explain why (others on this board might know) but a faulty voltage regulator will cause the engine to heat up due to excess voltage in the system. one day my car started overheating and i noticed that my fuel pump was louder than it usually is, then i looked at my volt meter and it showed 20+ volts! this happened on my way back to sac from the bay, and i turned on everything (aircon, lights,..) i could think of to try to drain the voltage so it wouldnt overheat. the engine was running hot the whole trip back but thankfully it stayed out of the red. i replace the alternator (since the voltage regulator is integrated in it) and it fixed the problem.

since you seemed to have tested all the mechanical possibilities, i thought i might throw this one out there. check your voltage next time you drive the car.

i think i figured out what it is, i think it's a tuning issue. i had the owner of turbo power tweak my ignition map a little to get a decent base map. well i think he went a little too aggresive with the timing. i took a couple degree's out and im gonna drive the car and see what happens. i'll keep you guys posted.

Originally Posted by whiteautogsx

i cant fully explain why (others on this board might know) but a faulty voltage regulator will cause the engine to heat up due to excess voltage in the system. one day my car started overheating and i noticed that my fuel pump was louder than it usually is, then i looked at my volt meter and it showed 20+ volts! this happened on my way back to sac from the bay, and i turned on everything (aircon, lights,..) i could think of to try to drain the voltage so it wouldnt overheat. the engine was running hot the whole trip back but thankfully it stayed out of the red. i replace the alternator (since the voltage regulator is integrated in it) and it fixed the problem.

since you seemed to have tested all the mechanical possibilities, i thought i might throw this one out there. check your voltage next time you drive the car.

was the car actually running hot? or was it just messing with your sending unit? might have been giving a false signal due to the higher voltage.

Originally Posted by turbocooker

i think i figured out what it is, i think it's a tuning issue. i had the owner of turbo power tweak my ignition map a little to get a decent base map. well i think he went a little too aggresive with the timing. i took a couple degree's out and im gonna drive the car and see what happens. i'll keep you guys posted.

retarded iming usually will make it run hot not the other way around.

Originally Posted by turbocooker

Originally Posted by whiteautogsx

i cant fully explain why (others on this board might know) but a faulty voltage regulator will cause the engine to heat up due to excess voltage in the system. one day my car started overheating and i noticed that my fuel pump was louder than it usually is, then i looked at my volt meter and it showed 20+ volts! this happened on my way back to sac from the bay, and i turned on everything (aircon, lights,..) i could think of to try to drain the voltage so it wouldnt overheat. the engine was running hot the whole trip back but thankfully it stayed out of the red. i replace the alternator (since the voltage regulator is integrated in it) and it fixed the problem.

since you seemed to have tested all the mechanical possibilities, i thought i might throw this one out there. check your voltage next time you drive the car.

was the car actually running hot? or was it just messing with your sending unit? might have been giving a false signal due to the higher voltage.

ahh shiet, yea, it was probably the sending unit, i never really thought of that. sorry for making a claim before i really knew what was up. :)