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Dear Spook, I am fine, thank you - and hope you are as well. I can understand your situation with a newly acquired 940 and written evidence of a previous problem. Taking the extra step of having a test performed set your mind at ease. I believe the OP is taking it too far. No matter how much testing is done there are no guarantees that every possible cause will be discovered but the symptoms - especially the misfire at cold start up and the swollen expansion tank - point directly to a head gasket issue.
I have to admit to not being particularly technically oriented. I have great respect for those Brickboard posters who are. If I have a problem with my computer beyond shutting it down and re-booting I'd have to look for a "computer guy" for guidance. When it comes to automobiles I look at the total situation and try to make some sense of it in a logical fashion but at some point you just have to get after it and tear it down. As I mentioned (in the case of the MGB) waiting to act led to unrepairable damage to the motor. Imagining possible faults with the water pump is not a productive course of action. In all my years (and hundreds of cars worked on) I've yet to ever find a water pump not pumping. Leaking seals, worn bearings, upside down thermostat -- yes -- but the first bit of damage (the HG) is what needs attention--the rest will make itself known. -- Dave
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