Thermostat replacement

1999 PONTIAC GRAND AM

260,000 MILES • 2.4L • 4 CYL

TWINMARK44

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2 POSTS
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Located the thermostat housing and removed the two 8mm bolts. I don't know how to drop the housing down to expose the thermostat for removal. I've heard about a 13mm bolt that has to be removed but I can't find the 13mm bolt. If someone could just explain to me where it is or send me a diagram, I'd be able to finish the job.

Thank you

Dec 4, 2021 at 12:41 PM

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SQM

AUTOMOTIVE REPAIR CONTRIBUTOR
6,383 POSTS

Hello,

The third bolt is toward the bottom. You will find it if you follow the tubing. Replacing the thermostat does require the removal of few items including the exhaust manifold heat shield, wheel, and splash shield.

Here are some best practices when replacing the thermostat:

https://www.2carpros.com/articles/replace-thermostat

I have attached the replacement procedure for your vehicle below.

Please let me know of any questions.
Thank you.

Images (Click to enlarge)

Dec 4, 2021 at 6:47 PM