Thermostat housing replacement

Tiny
IMAGING
  • MEMBER
  • 2005 TOYOTA SIENNA
  • 3.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 127,000 MILES
When uninstalling the thermostat housing, will the thermostat fall out?
If it does fall out, how do I know the position or angle it should go back correctly. Do I need to replace the gasket on the thermostat? It's a brand-new thermostat and gasket just installed about 6-7 months ago along with the radiator and lower and upper hoses.
Tuesday, November 9th, 2021 AT 7:04 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Hi,

Since the thermostat is still basically new, you can reuse it. However, I would recommend replacing the gasket.

As far as the thermostat, it will likely be stuck to the engine, so it shouldn't fall, but it is possible.

When reinstalling, simply place the giggle valve at the specified location in the directions I sent on the original post. If you are concerned that it may fall or move, put a couple of small dabs of gasket maker on the thermostat outer ring, position it where you want it, and it will stick. Wait about 20 minutes for it to set before continuing.

Let me know if this helps.

Joe
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Tuesday, November 9th, 2021 AT 8:48 PM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

When the thermostat hosing gets removed, the thermostat should not fall out as it fits snugly inside the housing.

I have included the replacement procedure for the thermostat, which shows the angle it needs to be installed, just in case it falls out.

Please let me know of any questions.
Thank you.

https://www.2carpros.com/articles/how-an-engine-thermostat-works
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Tuesday, November 9th, 2021 AT 8:49 PM
Tiny
IMAGING
  • MEMBER
  • 151 POSTS
Now, there's no way to remove and install the thermostat housing without removing or just loosening up the starter.
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Wednesday, November 10th, 2021 AT 2:23 AM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
That is correct, you will have to remove the starter along with the air filter box and battery.
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Wednesday, November 10th, 2021 AT 7:27 AM

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