Coolant leaks after mechanic work was done?

2017 CHEVROLET SONIC
115,000 MILES • 1.8L • 4 CYL • 2WD • AUTOMATIC
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CORESONIC2
  • MEMBER
  • 2 POSTS
At the end of July I had my car listed above in to have the timing belt (tensioner and related parts), water pump, and serpentine belt replaced. A few weeks ago I noticed a coolant leak that I didn't have before. It seems to be coming out of a connector on top of the thermostat housing.
Oct 2, 2025 at 1:27 PM
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CORESONIC2
  • MEMBER
  • 2 POSTS
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Oct 2, 2025 at 1:28 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Sorry for the repeat, the site had an issue but it is fixed now, this problem is because the part is made out of plastic not the mechanics fault, just bad timing. The coolant sensor will need to be removed and installed into the new thermostat housing. Let us know how it goes.
Oct 7, 2025 at 11:14 AM
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