overheating at idle

[89supra884]

well i put a new thermostat in like 200 miles ago, and everything was working fine, but all of a sudden, i was sitting infront of my house, and i looked at my temp and it was on hot, so i started driving again, and it went down, so it goes down when i drive. any explinations.

thanks

billy

 

[AJ'S 88NA]

Low on coolant?

 

[gaboonviper85]

is your fan working....is there a shroud around the fan?....did you put the thermo in correctly?....

also...i do not recommend driving a car around while its overheating.

 

[benchwarmer]

Fan or damaged shroud, maybe a defective thermostat. Did it do this before you changed thermostats?

 

[BlackDynamite]

well, both of my supra's haven't had fan shroud's. They actually run the exact same as with the shroud(temp wise). I could see if he were in a HOT location in the middle of summer, at a dead stop....but it says he from chicago and in december? I dunno, you tell me.



Just make sure your fan is working good(The clutch on the fan is prolly shot. So when you start driving, the air flowing through the radiator cools it down.). Check coolant. Check thermo. If all check out, then hope to god you don't have BHG.

 

[Rennat]

make sure theres no AIR in your system.

 

[89supra884]

well not low on coolant, ya it is winter, and i am going to check the fan tomorrow, ya it did this before i replaced the thermostat, but not at idle, the thermostat would just stay closed, so i replaced it like 300 miled ago, so its new, now all of a sudden it is overheating again, ya it is in right though

 

[BlackDynamite]

Did you get an OEM Toyota Thermostat?

 

[Nomad707]

run it open loop with no thermostat and if it doesnt do it, you know its the thermostat =)

 

[IJ.]

I just had a genuine Toyota T Stat fail

 

[wiseco7mgt]

sounds like fan, beg- borrow or steal another and try it first. IJ i used to run a parts shop and it's amazing how many good brand thermostats don't work out of the box.(mostly stant),
I'd personally go a Tridon high flow over a factory toyota one any day.

 

[IJ.]

Pretty sure my Summer one is a Tridon Pete!

 

[jdub]

I just had a genuine Toyota T Stat fail

Same here...I have had good luck with the Stant SuperStats. Regardless of brand, I test them in a pot of boiling water now to make sure they open. Cut the jiggle valve off too (after they test good).

 

[BlackDynamite]

Same here...I have had good luck with the Stant SuperStats. Regardless of brand, I test them in a pot of boiling water now to make sure they open. Cut the jiggle valve off too (after they test good).

Just curious, why would you cut the Jiggy valve off?

I've never heard of such.... :[

 

[gaboonviper85]

Just curious, why would you cut the Jiggy valve off?

I've never heard of such.... :[

help purge the system of air....keeps coolant moving threw the motor to help push out bubbles...

 

[BlackDynamite]

i figured....does it affect warm up time?

Mine warms up fine now and i don't have any problems, i'm just curious.

 

[jetjock]

You don't have to cut it off. Call it an old school thing from the days when stats didn't have bleed holes and we had to drill 'em. It's one less thing to go wrong. On the other hand you loose the bubble breaking action of the jiggler. Myself, I always snip it off...

 

[BlackDynamite]

You don't have to cut it off. Call it an old school thing from the days when stats didn't have bleed holes and we had to drill 'em. It's one less thing to go wrong. On the other hand you loose the bubble breaking action of the jiggler. Myself, I always snip it off...

Alright, thanks, good to know :]

 

[jetjock]

You be welcome. Either way make sure the hole/valve gets mounted in the vertical (12 o'clock) position. Despite it being clearly spelled out in the TRSM some people don't do it...

 

[wiseco7mgt]

Same here...I have had good luck with the Stant SuperStats. Regardless of brand, I test them in a pot of boiling water now to make sure they open. Cut the jiggle valve off too (after they test good).

This is the best advice right here^ always test them first.