Thermostat Bolt removal issue?

Tiny
DANIEL NELSON2
  • MEMBER
  • 2003 CHEVROLET MONTE CARLO
  • 2WD
  • AUTOMATIC
  • 118,000 MILES
I need help getting off the bolts that hold the thermostat the bottom one in particular.
Sunday, November 12th, 2023 AT 11:24 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,689 POSTS
Hi,

I need to know which engine you have. Is it a 3.4L or a 3.8L? (See pic below).

Let me know. If it is the 3.4, you will need to remove the crossover pipe.

Take care and I'll watch for your reply.

Joe

See pic below.
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Sunday, November 12th, 2023 AT 8:52 PM
Tiny
DANIEL NELSON2
  • MEMBER
  • 35 POSTS
It is the 3.4.
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Tuesday, November 14th, 2023 AT 9:19 AM
Tiny
DANIEL NELSON2
  • MEMBER
  • 35 POSTS
How do I take off the crossover pipe?
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Tuesday, November 14th, 2023 AT 9:20 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,689 POSTS
Hi,

Yep, you have to remove the exhaust cross-over pipe to access the thermostat. I attached the directions below.

The first four pics are for thermostat replacement. In pic 2, I highlighted what needs to be removed. The cross-over pipe directions start with pic 5.

Let me know if this helps.

Take care,

Joe

See pics below.
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Tuesday, November 14th, 2023 AT 2:52 PM
Tiny
DANIEL NELSON2
  • MEMBER
  • 35 POSTS
What size are the bolts because I lost one?
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Tuesday, November 14th, 2023 AT 4:23 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,689 POSTS
Hi,

That type of information isn't provided in my manual. Is it possible to remove one of the other two and have it sized for replacement?

Let me know.

Joe
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Tuesday, November 14th, 2023 AT 4:30 PM

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