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Coolant leak after the radiator and hoses and thermostat were replaced

Tiny
JIMMY RAY
  • MEMBER
  • 2006 CHEVROLET ASTRO
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 198,000 MILES
Overheated so we replaced the radiator and hoses to the radiator and thermostat. It was fine the first day but overheated the next and seems like it's leaking right behind the alternator. Have water running down the block between intake and valve cover on passenger's side. I can't find the source.
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Monday, June 27th, 2022 AT 12:55 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

If it is near the alternator, my first suspect is the coolant bypass between the water pump and the intake.

I attached a pic below (Pic 1). Check that hose first. If it is good, check the two locations where the water pump attaches.

Let me know what you find or if you have other questions.

Take care,
Joe

See pics below.
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Monday, June 27th, 2022 AT 9:47 PM

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