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Coolant leakage

Tiny
JOE1953
  • MEMBER
  • 1996 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • RWD
  • AUTOMATIC
  • 248,000 MILES
I did a radiator pressure test and there is a leak at the rear of the engine running down and I can't see where it is coming from look like I did see a tempture switch and a rubber hose in the back could the leak be coming from the switch or the hose? I don't no where the hose is connected to can you tell me where the hose is connected to how can I find the leak?
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Friday, June 27th, 2014 AT 5:47 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
The rubber hoses back there are to the heater core. Yes, they could be leaking. As far as the temp sending unit, it should be on the top of the intake.

If it is running down the back of the engine, chances are you have either an intake gasket leaking or a head gasket. More than likely, the intake.
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Tuesday, July 7th, 2020 AT 1:22 PM
Tiny
JOE1953
  • MEMBER
  • 619 POSTS
Is there another way I can check for a intake manifold gasket and head gasket leaking?
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Tuesday, July 7th, 2020 AT 1:22 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
You are doing the right thing, pressurizing the system. The only thing I can suggest is to get a mirror and place it back there so you can see where it comes from.
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Tuesday, July 7th, 2020 AT 1:22 PM
Tiny
JOE1953
  • MEMBER
  • 619 POSTS
How large the mirror need to be and what type of light I need to use to see back there?
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Tuesday, July 7th, 2020 AT 1:22 PM
Tiny
JOE1953
  • MEMBER
  • 619 POSTS
What size mirror I need to use and what type of light I need to use to see back there?
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Tuesday, July 7th, 2020 AT 1:22 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
No specific size. Anything that you can fit back there to see behind the engine. Same with the light.
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Tuesday, July 7th, 2020 AT 1:22 PM

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