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It is overheating and we cannot figure out why

Tiny
THOMPSON.ANDREA1993
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 104,000 MILES
It is overheating and we cannot figure out why. We have replaced the thermostat, radiator, water pump (twice), flushed the heater core and the entire system, burped the system and cleaned the overflow tank in case it was cruddy and stopping up the lines. Nothing. The heat is sporadic, the top radiator hose gets hot but has no pressure, and when it overheats it spews from the overflow tank heavily. Overheating tends to coincide with heat loss inside the truck.
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Monday, March 20th, 2017 AT 6:09 PM

2 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,442 POSTS
Run a combustion gas test on the cooling system. Rapid overheat the "hot" hose with no coolant pressure and no visible leaks and with the parts you replaced is a sign of a failing head gasket. The gas test will show you if there is exhaust gas in the coolant. There shouldn't be. You can usually "rent" the kit from a parts store.
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Tuesday, June 1st, 2021 AT 6:15 PM
Tiny
RYAN L
  • ADMIN
  • 256 POSTS
Have you replaced your coolant reservoir cap? A bad cap can cause that and be tough to diagnose. They are super cheap so it is a good idea to replace it anyways.
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Tuesday, June 1st, 2021 AT 6:15 PM

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