Overheating No visible signs of leakage

Tiny
STACI SEYMOUR
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
Replaced water pump, radiator, thermostat, heater connector on firewall, alternator, starter. No visible signs of leakage. Not using coolant. Still overheating? What to do?
Sunday, July 1st, 2018 AT 9:12 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This is normally caused by one of two things. First it could be a head gasket issue, so we need to start with checking the head gasket using the chemical test shown in this guide.

https://www.2carpros.com/articles/head-gasket-blown-test

If the vehicle is still overheating, then there could be an air pocket, but it is less likely if all these components have been replaced to address this issue. However, if this issue started after all these parts have been replaced then we need to bleed the system by lifting the corner of the vehicle that is closest to the radiator cap so that the air will work its way to the highest point.

https://www.2carpros.com/articles/symptoms-of-an-overheating-engine

Basically, we need to start back at the beginning with this one because I suspect we have missed something so the next thing to check is if the fan is spinning on high when the engine is getting hot.

If not, then we most likely have an issue with the fan clutch.

https://www.2carpros.com/articles/fan-clutch-symptoms

Please see the attached info below on how to test the fan. Please run through all this info and let us know what questions you have. Thanks
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Saturday, December 4th, 2021 AT 5:16 PM

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