I have the TRD (160 degree) thermostat and it works great all year round.
To install it, I emptied the radiator, then got under the car and pulled the thermostat housing. It has 2 bolts if I recall correctly. One I unscrewed from the top of the engine bay, the other from under the car. When the housing comes off, the thermostat will be sitting inside it.
Hope this helps.

 

Thanks Seattle. So to your recollection you didn't have to remove anything else to get to the thermostat housing?

 

Nope, but I have a small single. I don't know how much harder the job will be if you have the twins cuz they're a little bulkier and I can see how they would get in the way, but you definitely should be able to pull the thing with out removing anything else.

Edit: If your on stock twins, I think you need to remove the intake piping that's blocking the top bolt. Sorry about the confusion, hope that works for you.

 

Thanks again.

 

Anyone with twins have any instructions on doing this?

 

Dude this is very easy to do... get under the car and look.

I dont know of any write up and I dont want to do one for something so easy... it was already done above....

Here download the TRSM... you sound like you really need it.
http://www.97supraturbo.com/Tech.html

under cooling ... it will go step by step... that should help you out... and the TRD 160 thermo is not made anymore... a stock 180 will do fine.. and from what you said it does not sound to me that your thermo is stuck open at all. In the TRSM it will also show you how to test your Thermo to see if it works and opens at the correct temp.

 

Dude, although I appreciate the tech article, I don't appreciate the attitude! I'm sure if we were all as smart and young as you we wouldn't even need a forum.

 

after looking at the trsm, i was able to determine that the thermostat is located in its housing, which is connected to the lower radiator hose.

 

Well if your talking about removing misc components, its nothing serious, but if you have an undertray you probably have to remove that, and disconnect the lower radiator hose. Also be prepared to drain the coolant and you may have some water coolant drippage when you disconnect the water hose. Besides that its easy.

 

Hello
Step one as the above members mentioned is to empty out the coolant complete. You don’t want any of that stuff in your mouth or nose if you are under the car and you still have coolant inside

Make sure the car is cooled off well

Components that you will be near are
Alternator
Various wires , connectors

Some Thermo housings depending on age will or may be stuck do to age .
Thus -when you are removing the 10mm bolts from the housing and if the housing doesn’t get loose
Tap on it with a rubber mallet -gently
At this time inspect the passage with a light. Feel the inside with ur fingers. If there is sludge or any gunk I would do a flush and let clean water circulate from top to bottom

Next clean all gasket/ old silicone material with a razor and solvent
Make sure the mating surfaces are dry before applying new gaskets/ silicone or both

Always use Toyota approved coolant AND !!!! Distilled water !!! Never tap water !!

Make sure the hose clamps are good and if needed, replace with new T bolt or ring worm style !

Start it up , open radiator cap let the bubbles build up add coolant if needed !

Wear eye protection and gloves

Use safety and precaution when lifting a car

Use your eyes and brain ?

Don’t be under the influence either

 

What brand of thermostats are you getting?