Temperature jumped from 210 to 240

2004 CHEVROLET BLAZER
144,000 MILES • V6 • 2WD • AUTOMATIC
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RSTILL
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  • 1 POST
Then check gauge light came on. pulled over check for overheating no boil over had air on turned off. thought it was thermostat, replace but still issue. happens more when turn on. air temperature been running from 210 to 245, but no boil over. checked for leaks none found.
Aug 22, 2019 at 2:10 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
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Welcome to 2CarPros.

I have a few questions. First, does the temperature rise when you are driving at highway speed or is it limited to stop and go traffic? When you say it doesn't boil over, do you feel the engine isn't as hot as what the gauges is indicating? When you changed the thermostat, by chance did you flush the radiator? Are there any leaks? Is the radiator cap old? Is there any noticeable coolant consumption?

Sorry for all the questions. So many different things can cause this to happen. If it is running hot at highway speeds and you have already replaced the thermostat, I would recommend flushing the system. Here is a link that explains how it is done:

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

Again, sorry for all the questions. Let me know as much as you can.

Take care,
Joe
Aug 23, 2019 at 8:49 PM
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