umm.... not sure if any of you notice this....

i just got the trd thermostat for the gs400.... was all excited and started to pull out the hose etc... and all the coolant flying...

but once i took out the stock thermostat, i noticed that its diameter quite a bit bigger than the trd one i got. the trd one doesn't really fit in the original position of the oem one....

do i have a wrong part? or is it supposed to be? if so, how the heck am i going to fit the smaller thermostat in? btw i got the thermostat from steve ganz of course

and wasted me couple of hours and tons of coolant running around @_@

 

henry

imo it sounds like you have the wrong part , the thermostat needs to fit like oem or else how does it stop the coolant from flowing constantly..


i am actually going with the toms one soon , the toms version is supposed to lower engine operating temps by 10-20 deg in conjuction with either the toms or trd rad cap which i have already

 

Will a different thermostat bring up a check engine light on a GS 430?

 

Wait Rominl is asking a question? What a noob LOL j/k. I was going to get the TRD thermosat too since I have the radiator cap and oil cap. Let me know if it also keeps the engine cooler. Since I have a 300 it should fit fine right? Same as a supra.

 

haha shut up hey at least i did a search

yeah i am talking to steve to find out why it's smaller. this is so confusing @_@

and i was like dead filling coolant and stuff last night... COLD....

 

Henry,

I didn't get a chance to compare the one I got for my GS (TRD vs OEM), but I was concerned I got the right part. It wasn't well labeled for GS v8, engine code or even model. However I did ended up going to the TRD website where they list all their parts and figured out the same TRD thermostat was used for the engine in the GX470, etc v8 engine and I found labeling for '470' on the box.

A little backward I know, but might help. I don't have that TRD site bookmarked on my laptop here, but its the same one I've used to look up the TRD LSD model number before.

 

Interesting question Henry... I got the Toms Thermo that Steve gave me and the install went perfect. A nice OEM fit. And it really does do a good job when driving on the freeway... keeps me 10 deg. cooler.

 

update: seems like they sent me the wrong one, instead of one for v8 they sent me one for i6

i should be getting the new one soon, we will see how it goes

 

where can i get a toms thermo from

 

I was wondering if you can really notice the difference in the temp guage? The GS400/430 doesn't really run hot like other makes in my opinion. It requires a certain amount of heat to put the system in "closed loop" .

Of course, I am running a "stock" engine, and as such, my comments may not pertain to those of us that have superchargers and turbos, ect. These units will run hotter anyway. But a stock unit with a real cold thermostat may also burn a bit more fuel due the computer seeing a colder engine and adjusting the fuel flow upwards.

I use a plug in AUTOXRAY scanner, and with the stock thermostat and the engine at idle fully warmed up, the temp fluctuates between 190 to 208 degrees F. The fan comes on at 208F, and goes off at 188 degrees. If I have the AC on (many people run their GS's this way..I do most times), the high speed fans never come on, just the slow speeed fans that occur with the AC.

I just bought my 99 GS4 from Scottsdale Arizona about a month ago. When I left Scottsdale headed for California, it was 112F outside. I drove from Scottsdale through Blythe, Calif where it was 115F. I ran A/C (naturally) while driving 75-80 mph, and the temp guage never read any hotter than it always reads. My GS burns enough gas as it is without making it burn more.

Bottom line is: to me, the system is very efficient as it is, and making it too cool may not be desirable in all cases. I put a "160F" thermostat in an old Mustang I used to own, and I found that I burned more fuel, and the soot in the tailpipe increased over normal. Once I changed back to stock, things went back to normal. Once again, I did not have the car supercharger or turbocharger, so in stock configuration, I found I did not need the colder thermostat.
Just my $.02

 

carson toyota

well i don't know if it will really work fine, but i figured it will never hurt to have them, so...

 

resurrecting an old thread.

i have the same problem rominl had. i bought a trd thermostat online and it didn't fit. i looked at the application list posted above but couldn't find myself there (1uz-fe gs400 does not seem to be listed under the aristo application, unless i'm looking at it wrong).

the packaging my trd thermo says on the side:

0002-17620-440 thermostat, 160deg, 4.7s/c
16340-sp030
90916-03100

help?

 

The 2JZ uses the Type 3 Thermo(16340-SP020). The V8's use Type 4 (16340-SP030).

 

Jeff is correct about the number for the Gs400/430.
Here is a pic of mine when I changed to a TRD thermostat on my 430. you can see they are the same size. TRD on the left.

 

i'm completely lost... it looks like the one in your pic, and jeff has confirmed that the part number is correct (at least on the box)... but i can't make it fit??!?

maybe i'm doing something wrong...