GS4_Fiend

iTrader: (22)

Make sure ur radiator cap is good.

lilsharky

iTrader: (6)

i have a brand new koyo cap that came with the radiator i replaced. which did not solve my overheating problem so i disconnected that sensor waiting for the new one to come but it was the wrong one...oh and fans dont come on at all if that sensor is plugged in

dejavu157

iTrader: (2)

check your coolant reservoir. see if there's a crack in that one.

lilsharky

iTrader: (6)

everything is fine its just that my fan wont engage when the coolant hits that certain temp. so i wanna know what is the name or part number for the sensor that goes in the radiator. thanks in advance

ydjy

toyota 89428-33010

sam430

iTrader: (10)

ok, I'm having similiar problems so I guess I can ride on this thread. I have the same code p0125 and also I just changed the thermostat. The upper hose build so much pressure, it popped off. Upper hose hot and pressurized, bottom hose is cool.

cross finger head is damaged.

sam430

iTrader: (10)

so I put back my old thermostat and everything runs fine. The temp never go up and the fan comes on when hot. Still, the p0125 persist.

damn thermostat might have ruined my engine.

lilsharky

iTrader: (6)

what fixed my problem was temp switch. i replaced that after the thermostat and radiator. ebay has one for 21 cheap fix

lexo98

iTrader: (2)

did you bleed the cooling system of the air the last time you took the coolant out?

sam430

iTrader: (10)

before u changed the temp switch, did your fan come on when hot? because mine comes on without having to turn on the ac.

btw, where is temp sensor located?


my car doesnt overheat...it was me trying to get rid of p0125 caused me to test and switch out the thermostat... the freakn 20 bux stat could have killed my engine grrrr! the nww stat was defective.

lilsharky

iTrader: (6)

sometime it would overheat till the top part and fans kick in.
its located inside the radiator on the bottom right if your facing the car.
i guess we have different problems then. mine overheated with new stat

sam430

iTrader: (10)

oh cool...should be easy to change it then. did you do a chemical block test to check the block? there is a kit for rent at autozone but u have to purchase the fluid (5 bux) to test for problems.

i guess i will fiddle around some more.

lilsharky

iTrader: (6)

nope i didnt do any test...its been running fine since the temp switch. if you do change out your temp switch, you should be careful because i broke my brand new oem one. that is why i bought an ebay one that cost 1/3 of what the oem is.

Champstar

Having the same problem now with my 1998 Gs400.
Changed thermostat
Changed radiator cap
New fluid
Car still overheats after a while and the fans are not turning on at all.
I even unplugged the temp switch, but the fans still do not turn on.
Does anyone know what I should try next?
any suggestions will be greatly appreciated.