Radiator leak

1994 GMC SONOMA
176,000 MILES • 2.3L • 4 CYL • 2WD • MANUAL
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JOHN DEVANE
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  • 3 POSTS
Radiator leaks down at about 23 miles of driving, engine does not overheat.
May 27, 2016 at 9:59 AM
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HMAC300
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have this checked for a head gasket failure have it pressure checked first. Then there is a chemical they can add to check further.
May 27, 2016 at 12:06 PM
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JOHN DEVANE
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pressure check has been done.
May 27, 2016 at 1:54 PM
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HMAC300
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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.
May 27, 2016 at 4:24 PM
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JOHN DEVANE
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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.
May 27, 2016 at 6:19 PM
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STRAILER
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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
May 29, 2016 at 8:17 AM