My thermostat seems to be toasted.
The car would indicate that it's below the C line even after driving for 30 mins

It would means that the car is running rich and have a high idle to protect the "cold" engine right?

my quesiton is
is there a guide to for thermostat replacement on the GT-four?

I got the ST205 & 3SGTE repair manual supplement pdf
is the thermostat the same as the "intake air temperature sensor"?

Anyone have the parts number for the 3s-gte thermostat?
I come from a pretty cold place so I don't think I'll need a TRD low temp thermostat.

This post has been edited by Artega: Feb 23, 2010 - 3:20 PM

http://toyotaownersclub.com/forums/index.p...mp;#entry710379
http://wiki.answers.com/Q/How_do_you_repla...1993_Toyota_MR2

Thermostat: 90916-03100
***Thermostat: 90916-03117 (Substitute: From Land Cruiser)
Both thermostats fit.

^ good info on the landcruiser

does your heater blow hot air?

hardly
and not when the temperature gauge shows C

it does blow hot air after driving around for a while, then idle for 5 mins
the gauge would show it's warming up and start blowing hot air
then I would go driving and the gauge would show it's cooled down and no more heat.

so I'm guessing the thermostat is stuck open.

Yep, I think you're right on the money there about the thermostat being stuck open.

oops
I guess i need to buy the gasket as part of the replacement.

Sounds like as part of the repair I'll need to drain and replace the radiator fluid?

>
Yep and some will come out, a decent amount, it's just a good thing to go ahead and change out your fluid if it's been a while anyways.