overheating

1998 CADILLAC DEVILLE
150,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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JAMES WOOD4
  • MEMBER
  • 2 POSTS
replaced radiator, water pump, thermostat, radiator cap.
flushed entire system, water runs clear and flows fully in all directions. coolant tank checked no leaks. fans are kicking on when they are supposed to, and thermostat is opening fine. bypass line clear as well.
car overheats after driving for short period of time.
Sep 18, 2021 at 8:44 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,244 POSTS
Hi,

If everything is working properly and it still overheats, it could be related to things such as a bad head gasket or even a plugged catalytic converter.

Before it overheats, does it run properly? Also, will it overheat if you are driving at highway speeds or only in town, stop-and-go traffic?

Take a look through this link. It identifies different things to check if a head gasket is suspected.

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

Let me know.

Take care,

Joe
Sep 18, 2021 at 2:41 PM
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