Coolant leak after the radiator and hoses and thermostat were replaced

2006 CHEVROLET ASTRO
198,000 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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JIMMY RAY
  • MEMBER
  • 2 POSTS
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....
Jun 27, 2022 at 5:55 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 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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Jun 27, 2022 at 2:47 PM
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