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My car overheated recently?

Tiny
MSHELDON85
  • MEMBER
  • 1996 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES
My car overheated recently, I checked it out and noticed the water pump was leaking. I replaced the water pump yesterday. I filled the radiator. I let the car run for a little while and it over heated. From a cold start it is only taking about 5 minuted to start to get really hot. The upper hose gets really hot alot of pressure, the lower hose only gets a little warm with not so much pressure. I was thinking head gasket but there is no sign of coolant in the oil. Any ideas?
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Monday, January 25th, 2010 AT 3:31 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

The issue you are describing sounds like a stuck closed thermostat. When a thermostat fails at closed position, it will prevent coolant from flowing thru the engine. This will crate a temperature difference between the two radiator hoses, one will be hot and another relatively cool.

https://www.2carpros.com/articles/how-an-engine-thermostat-works
https://www.2carpros.com/articles/replace-thermostat

I have attached the thermostat replacement diagrams for your reference.

Please let me know of any questions.
Thank you.
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Wednesday, September 22nd, 2021 AT 9:50 PM

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