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Temperature gauge floats around near bottom line?

Tiny
POOR-JOHN
  • MEMBER
  • 1999 TOYOTA AVALON
  • 225,000 MILES
Car warmed up, runs okay, fluid level in overflow container okay, but engine temperature just above bottom.
Friday, December 8th, 2023 AT 12:37 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,910 POSTS
This can happen when the engine cooling system thermostat sticks open, here is how to change it out and see if this is the problem which is likely. Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

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

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Friday, December 8th, 2023 AT 1:26 PM
Tiny
POOR-JOHN
  • MEMBER
  • 7 POSTS
Thanks! This morning the thermostat worked perfectly so I deferred the replacement. Any idea what causes a thermostat to be stuck open and then recover? (I.E. Should I consider replacement to be urgent?)
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Friday, December 8th, 2023 AT 5:21 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,910 POSTS
If you have the problem again, I would replace the thermostat. They just stick sometimes.
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Saturday, December 9th, 2023 AT 8:57 AM

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