Radiator leak

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

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

JOHN DEVANE

MEMBER
3 POSTS

Pressure check has been done.

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Friday, May 27th, 2016 AT 1:54 PM

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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Friday, May 27th, 2016 AT 4:24 PM

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

KEN L

MASTER CERTIFIED MECHANIC
47,512 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