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96R

S90 hard to find coolant leak found

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Had a coolant leak that only occurred as the engine coola off after driving. First thought it was the water pump, replaced it with new gasket and it still leaked. 

Next fear was head gasket leak because it came from above the water pump, but there's no water mixed in engine oil.  The coolant was coming from the head gasket area when looking from below the car.

Finally after removing some parts, timing belt, timing cover, ran a pressure test on the block when engine was cold revealed it was the heater hose gasket coming out of Cylinder #1.  This $5 gasket was impossible to locate until you take many components off.

See the photo from a similar engine. The vertical hose on the far end was the culprit. Thick hose in the middle goes to the water pump.  You can see how this leak could lead you to believe it's a head gasket leak.

image.jpg

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