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Help locating small collant leak on '96 960. 900

I've been trying to stop a small coolant leak at the back of the engine. It only looses about 8OZ every 2 weeks. It doesn't leak enough to leave a spot on the garage floor or in the parking lot at work. I can see a few drops on the bottom of the brace that ties the two front suspension A arms together. (The one that runs under the engine at the transmission.) No drops on the bottom of the oil pan or transmission.

My first attempt was to replace all the rubber heater hoses and the control valve at the fire wall. I've felt around the ends of the new hoses and my hands come away dry so I don't thing the hoses are leaking.

I looked at the parts breakdown at the dealer looking for "O" rings around the block adapters but didn't find any.

Anyone have those pipes off to know how they are sealed?

Any ideas on locating or fixing a leak when I can't see the source?
--
'96 965 with 16' wheels at 120K. Had '85 745 Turbo Diesel for 200K.






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