celica overheated., Fan/Fan switch/Thermostat? Options

[Badkarma]

my gf's celica overheated today and by the time she realized the temp guage topped out, she was home and the car was steaming. when i got home from work i checked the coolant, it was low so i filled it and it isn't leaking. (not enough to notice) so i had her start the car and the fans didnt turn on at all while the temp guage topped out again after about 5 min.

i figure its probably the thermostat, Fan Switch/Relay, or the Fan itself. am i on the right track? how hard is it to pull the thermostat or fan switch/relay?

Thanks, Erich

[nics]

Revemove the ECT switch to see if the fan will run. If not you might have to replace it.

[Badkarma]

Thanks, I'll give it a shot. Now My other celica over heated today after she dropped me off at work. And a/c died

[nics]

Thanks, I'll give it a shot. Now My other celica over heated today after she dropped me off at work. And a/c died

The fans should run all the time if you pull it. If you run with the fans on and still overheats, try looking at other areas. Radiator cap, Thermostat or internal leak.

[Badkarma]

i pulled all the "fan relay" 's i could find. i pulled all 3 i found. the connection to the relay in the relay bos on the driver side of the engine bay was messed up. i got it to start up the driver side coolant fan. so now the driver side fan will run on both cars.. but still overheats.

Next is... replace the radiator cap?

[nics]

i pulled all the "fan relay" 's i could find. i pulled all 3 i found. the connection to the relay in the relay bos on the driver side of the engine bay was messed up. i got it to start up the driver side coolant fan. so now the driver side fan will run on both cars.. but still overheats.

Next is... replace the radiator cap?

Is there too much pressure when it overheats? Does the coolant look like kinda brownish or traces of oil?

[laff09]

Replacing the radiator cap would be a good idea, poor seal/ broken spring will cause it to overheat.

[Badkarma]

actually yeah, in the red 96' auto (gf's celica) the coolant looks very brown, almost pastey. like diarhea. haha. i figured rust but we did a coolant flush about 6 months ago. idk if its too much pressure. would that be a problem with the radiator cap?

erich

[spy00005]

well im having same problem overheating old raid was leaking and cap was busted so like a week ago i bought brand new raid and cap i have good hoses not leaking actually its not leaking at all anymore. fans wouldn't turn on so i unpluged the sensor and their always on but it still over heats but i did notice the bottom hose no matter how hot the engine got it had no pressure and was cold so im gonna replace my thermostat hopefully that fixes it. i would suggest you atleast take a look at that. see if that does anything ill prob let u know if it fixed my prob cuz we might have the same issue. hope that helps. also watch out for leaks. mainly through the reserve tank if it is the preessure might be building and being relesed through that lil hole in the reserve tank.

by the way not 100% sure but i think thermostat is here



This post has been edited by spy00005: Jul 5, 2009 - 10:19 PM

[trdproven]

check for leaks in the hoses
leaking water pump
leaking radiator
head gasket blown

[spy00005]

okay i replaced my thermostat and ran my car w/ the heat all the way up for 30min and it did not go to half. right just below it the whole time i still don't think 30min is good enough time to be 100% sure that solved my prob but it makes me hopeful. Ill try driving around for a while and see if it overheats if not problem solved the location for the thermostat is excatly where i thought it was but it was a B!tch to get out and i mean just the bottom screw cuz i have ac and the stupid compressor blocks all access to that screw. but i hope this helps you i would def check that out new thermostat plus gasket rubber less than 10 bucks.

[trdproven]

one way to test your temp without driving your car around is to hold your throttle down (dont rev it high) steady for a bit until you see the temp rise and steady out.

[nics]

If you decide to check internal leaks, you might wanna use this

http://www.arrowheadradiator.com/head_gask...n_leak_test.htm

[spy00005]

thats what i did lol trdproven i held it at like 3000 rpms constantly but then rev'ed it up 2 like 5 then let it go down. iknow its equivilent to driving but its not the same ive noticed actually driving is when you see things happen.

[Badkarma]

i gotta wait till i get paid next friday.. so ill give the wire connector a shot, and the thermostat if that dont work.

Thanks, Erich

[spy00005]

okay ive been driving my car since the last post and no overheat at all. actully doesn't even ever get to 1/2. hope u solved ur prob.

[Badkarma]

i disconnected the fan switch at the bottom of the rad. it started both fans, and the temp rose to half way, stayed there for ab out 10 min. then rose to max. the fans stayed on the entire time. tomorrow im going to buy a radiator cap, thermostat and some flush. we'll see if that works. i hope it fixes it. im hoping this works. been bumming rides 2 weeks till this paycheck.

another question though. if unplugging the fan switch is the only way the fans start. is that a problem with the relay, switch, fans, or the thermostat not working??

Thanks, Erich

[Badkarma]

well, the bolt to the thermostat on the 94 5spd is pretty rusted. and the head is rounded. so i tried just the new radiator cap in that celica and it didnt help. still overheated after about 5-10 min.

the 96 auto celica didnt repsond to a new thermostat or a new radiator cap either.overheated after 5-10min. i dunno what to do next.

both cars had the fans running the whole time.

Erich

[nics]

i disconnected the fan switch at the bottom of the rad. it started both fans, and the temp rose to half way, stayed there for ab out 10 min. then rose to max. the fans stayed on the entire time. tomorrow im going to buy a radiator cap, thermostat and some flush. we'll see if that works. i hope it fixes it. im hoping this works. been bumming rides 2 weeks till this paycheck.

another question though. if unplugging the fan switch is the only way the fans start. is that a problem with the relay, switch, fans, or the thermostat not working??

Thanks, Erich

No problem with the relay and fans. Does you fans EVER come on when everything is connected?

well, the bolt to the thermostat on the 94 5spd is pretty rusted. and the head is rounded. so i tried just the new radiator cap in that celica and it didnt help. still overheated after about 5-10 min.

the 96 auto celica didnt repsond to a new thermostat or a new radiator cap either.overheated after 5-10min. i dunno what to do next.

both cars had the fans running the whole time.

Erich

It does push all the coolant in the reservoir, isnt it? if thats the case then it would prolly b an internal leak.

Be prepared to spend $$

[Badkarma]

great.. could it be waterpump? in the 96 auto, when i took the rad cap off it was covered in rust/dirt. very gritty feeling. that cant be good.

and the 94 5 spd i took the rad cvap off and it smelled like...fish. odd. right?i think i may take one to a shop so i can at least have one to drive for now. and maybe get an educated heads up on what the problem could be with the other celica.

Erich