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Username Post: HELP!! Trying to diagnose a coolant loss on my 93 G20 van with a 350        (Topic#366619)
Posts: 2

Reg: 10-07-21
10-07-21 08:08 AM - Post#2828712    

I'm losing coolant in my 1993 g20 van 350 5.7 engine.There are no external leaks. It seems to happening slowly. I know it going into the engine. I'm trying to make sure its nothing else before I go replacing the head gasket. Could it be the oil cooler? Seems like there is a small oil leak coming from that area. Not sure where yet until I take the fan shroud off. Could it possibly be the water pump? The oil looks to be normal color...maybe just a little dark. After putting the correct amount in ..after driving and checking the dip stick looks overfilled. And it seems unusually hot. Any help or advice on narrowing this problem down will be greatly appreciated.


Posts: 352

Reg: 07-09-18
10-11-21 11:32 AM - Post#2828973    
    In response to Xnate421

It depends upon how much coolant you need to add and how much.

Coolant in the oil is easy to spot since it churns up and becomes milkshake like. Leaking down the block is hard to find but does leave telltale trails.

On the cylinder head, you would find one of the spark plugs with an unusual amount of deposits and that might tell you that you have a head gasket leaking.


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