How to and replace thermostat in 5th gen v6?

mountainair26

New member
Hi everybody. I'm looking for a guide or write-up on how to access the thermostat on my 2010 SR5 with the 1gr-fe 4.0l V6. I've searched and searched, and can't seem to find anything that shows you how to do it on this specific engine. There are some youtube videos with similar Yota engines but not this one. I know it involves loosening the V-belt, so I'll probably replace that along with the thermostat, but I'm not sure where to begin to access the thermostat? Any help appreciated. Thanks a ton
 
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Aaaaaaaaand I feel extra dumb. I'm guessing the black plastic part with "Toyota" printed on it in this picture is the thermostat housing connected to the lower radiator hose. For some reason I thought it was lower on the engine around the alternator.
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Yup, same as the 4th gen V6. Mine had 164K miles on it when I replaced it as preventive maintenance, wasn't causing issues and coolant temps remain the same with the new one. Stick with Toyota or Aisin if you decide to replace it, same for the coolant. There's a large o-ring that seals the thermostat housing, get a new one if the new thermostat doesn't include it. And use a torque wrench to tighten the bolts to factory spec, don't go by feel.

Also, it might be a light trick but your upper hose looks partially collapsed just downstream of the thermostat. If so, I'd replace that and the lower hose while you're in there.
 
Part #'s and Torque Specs

Just in case this helps.

Thermostat (with water inlet-assembly): Toyota part #: 160310P010
Thermostat O-Ring: Toyota part #: 1632631020
Thermostat Housing nut (3): Toyota part #: 90178A0023 (socket size: 10mm; torque: 80 in.*lbf)

Beginner Fluid Maintenance
 
Just in case this helps.

Thermostat (with water inlet-assembly): Toyota part #: 160310P010
Thermostat O-Ring: Toyota part #: 1632631020
Thermostat Housing nut (3): Toyota part #: 90178A0023 (socket size: 10mm; torque: 80 in.*lbf)

Beginner Fluid Maintenance

I think the part number for thermostat housing nut is incorrect? It’s coming up as a tire pressure monitoring nut and flags red for my 5th Gen. I can’t seem to locate the bolts for the thermostat/housing on any of the diagrams. If anyone knows this part number would appreciate it.
 
I think the part number for thermostat housing nut is incorrect? It’s coming up as a tire pressure monitoring nut and flags red for my 5th Gen. I can’t seem to locate the bolts for the thermostat/housing on any of the diagrams. If anyone knows this part number would appreciate it.

Here are the steps I took to find these part numbers:

* Note: MOST of this guide applies to all 5th gen 4Runners. However, keep in mind that this guide technically only applies to the 2016 SR5 with the VF2BM transfer case.

1) Go to: RADIATOR & WATER OUTLET. 2016 Toyota 4Runner | Toyota

2) Right below the image at the top of the screen, click the button/text that says "View More Images".

3) 5 smaller images will appear directly below this button/text. Now, click the last, small image (it's the 5th one).

4) Above the main, big image, on the right hand side, click the button/text that says "Full-sized Image".

5) You can now click on any of the small, pink squares corresponding to a part. After clicking one, you will be guided right to the exact part and part number.

6) I believe the part number in question is the "Thermostat Housing nut". It is shown as being part number "9415180600".
This part number has been superseded. If you copy this part number and search for it in the search box at the top of this website, you'll get the new part number that I listed in my original post.

I hope this clears things up! Cheers!
 
Last edited:
Sorry to bump an older thread but this was posted on the other forum. I plan to keep my 4Runner forever and if this was good for preventative maintenance I thought it would be a good idea as an upgrade

Thoughts?

Can someone do this on their own?

Billet Thermostat Housing for 4.0L 1GR-FE | Toyota 4Runner Forum [4Runners.com]

It's neat but I've never seen the OEM housing fail. My supercharged Tacoma, my friends desert trucks, basically full race Tacomas...none have failed.
 
Is it standard to replace the thermostat and housing, 16031-0P010? I'm trying to find the part number for just the thermostat but too many pop up. The maintenance thread above does not list it. My 2013 has only 65K and it's likely stuck open.
 

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