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Engine temperature getting too hot

Tiny
JEFF BOOKER
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 275,000 MILES
After driving for maybe seven miles or so my temperature gauge goes all the way to red (260). I have replaced the following: Thermostat, radiator, water pump, the rubber houses and the temperature sensor on the driver side of the engine. Any ideas what could be causing this issue?
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Monday, July 17th, 2017 AT 12:49 PM

5 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,443 POSTS
Run a pressure test on the system, you might have a head gasket starting to fail or a cracked head. The pressure test would give you an idea if that was the case.
Does the clutch fan work? When it gets hot is the fan turning?
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Tuesday, June 1st, 2021 AT 6:17 PM
Tiny
JEFF BOOKER
  • MEMBER
  • 3 POSTS
Belt driven fan.
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Tuesday, June 1st, 2021 AT 6:17 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,443 POSTS
Yeah, but it should be a clutch type. The clutch can fail, sometimes they lock up, sometimes they freewheel.
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Tuesday, June 1st, 2021 AT 6:17 PM
Tiny
JEFF BOOKER
  • MEMBER
  • 3 POSTS
It seems to be working properly speed wise and everything else. It is just a weird situation that I have been fighting with and getting tired of. At first, I thought it was caused by this moss looking stuff that I found in my overflow tank that may have gotten into the engine/cooling system so I flushed it and then replaced everything again and it still does it.
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Tuesday, June 1st, 2021 AT 6:17 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,490 POSTS
It should sound like an air plane taking off next to you when the truck is hot telling you the clutch fan is working.

Here are a couple of guides that will help

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

and

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

Here is how you check for a blown head gasket.

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

Please let us know what happens.

Cheers, Ken
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Tuesday, June 1st, 2021 AT 6:17 PM

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