Question about 1996 GMC Suburban

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Coolant leaks down by transmission

Wwhere would be the problem? SIR>

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  • geosny Nov 30, 2008

    i have the same problem the coolant comes out between the engine and transmission when pouring water into the radiator without the truck running and i dont see a freeze plug in that area

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Fist check your heater hoses that connect to the heater core as one of them may have a small pin hole in it and be expanding when it gets hot spraying coolant over behind the transmission.
the other two possabilities that come to mind are that a head gasket could be leaking at the back of the engine, or t could be a frost plug on the back side of the engine.
1) to check the heater hoses let the truck get warmed up and then try wiggleing the heater hoses by the heater core to see if they are leaking.
2) to check the head gaskets look around the back of the engine and see if you can see a stain that is white or rust color like a trail that water would leave if it was flowing,
3) if the coolant appears to be only coming out between the engine and the transmission then it is most likely a frost plug.

Posted on Oct 14, 2008

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