Radiator leak

Tiny
JOHN DEVANE
  • MEMBER
  • 1994 GMC SONOMA
  • 2.3L
  • 4 CYL
  • 2WD
  • MANUAL
  • 176,000 MILES
Radiator leaks down at about 23 miles of driving, engine does not overheat.
Friday, May 27th, 2016 AT 9:59 AM

5 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have this checked for a head gasket failure have it pressure checked first. Then there is a chemical they can add to check further.
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Friday, May 27th, 2016 AT 12:06 PM
Tiny
JOHN DEVANE
  • MEMBER
  • 3 POSTS
Pressure check has been done.
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Friday, May 27th, 2016 AT 1:54 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
When it is hot check radiator for cold spots if it has those as well as loose/green colored fins on edges and bottom or just cold spots then the rad is bad. I am assuming the thermostat is in good condition and not stuck and no leakage anywhere on engine like hoses or freeze plugs.
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+1
Friday, May 27th, 2016 AT 4:24 PM
Tiny
JOHN DEVANE
  • MEMBER
  • 3 POSTS
I have replaced the water pump, heater hose connector, coolant sensor, thermostat and the water pump adapter housing. I will check for cold spots next.
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Friday, May 27th, 2016 AT 6:19 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,631 POSTS
Hey John,

Have you checked the passengers side floor for coolant, sometimes when the heater core let's go it can leak there. Also can you do a chemical check for a blown head gasket?

Here is a guide to help

https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil

and

https://youtu.be/5zpNjYmmiYY

Let us know what you find
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Sunday, May 29th, 2016 AT 8:17 AM

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