Coolant Leak

FILMLESS

MEMBER
1999 CHEVROLET SILVERADO
V8
4WD
AUTOMATIC
339,911 MILES

I have a 1999 Chevy Silverado 1500 3 door 4x4 (Z71) with 339,911 miles on it. The truck has developed a coolant leak which I believe may be related to the heater core. Coolant drips down from behind the firewall when viewing from the engine compartment. The location (standing at the front of the truck) is to the left of the engine, behind where the heater core would be located. Inside the truck there is NO visual signs of a leak. The AC and Heat both work. No interior smells (of coolant) or visual fogs, etc. That is normally associated with a heater core failure. Is there a connection in that location that could product this? Thanks.

4 Replies

CADIEMAN

MECHANIC
3,544 POSTS

This is a heater core your right but to be sure this guide will help us find it

https://www.2carpros.com/articles/car-is-leaking-coolant

Please run down this guide and report back.

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Saturday, August 6th, 2011 AT 8:55 PM

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Any chance this could just be a connection considering the heat still works. At this point anyway.

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Saturday, August 6th, 2011 AT 9:03 PM

WRENCHTECH

MECHANIC
20,758 POSTS

You will need to inspect it a little more closely and determine exactly where the coolant is coming from. If it is coming out of the condensation drain, then yes, it could be a heater core but you also have a number of hoses, pipes and connectors in that area that could also be to blame.

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Saturday, August 6th, 2011 AT 9:03 PM

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Just crawled under the truck. Leak appears to be coming from between the firewall, i.E: the firewall has a seam, two pieces bolted together.
LOGICALLY this would indicate the leak is coming from the heater core area. Guess I will have to pull the dash and inspect the inside.
Thanks

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Saturday, August 6th, 2011 AT 9:14 PM