Thermostat change

Tiny
ROYGOSSETT
  • MEMBER
  • 1998 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 118,000 MILES
If I change the thermostat in my 1998 Chevrolet S-10, with a 4.3 engine, from a 195 degree to a 180 degree, will there ne any negative effects?
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Monday, August 8th, 2011 AT 7:04 PM

1 Reply

Tiny
CARADIODOC
  • EXPERT
Definitely. Engine parts won't expand to fit properly so excessive wear will result. The coolant will take longer to get to normal temperature. When it does, the computer controls go to "closed loop" where it fine tunes fuel metering based on readings from the oxygen sensors. When it stays in open loop, emissions will be higher and fuel mileage will go down.

The higher temperatures also reduce blowby and that which does occur is more likely to vaporize and be pulled out and burned rather than cause sludge in the oil.

If there is a problem now with engine temperature, you need to diagnose and repair that problem. Changing the thermostat to a lower temperature isn't going to fix an underlying problem.
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Saturday, October 3rd, 2020 AT 11:43 AM

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