Hi All;
Just changed the coolant in the car after suspecting a leak. I pressure tested it with the gagdet from autozone and found no leaks. the car seems to work ok, but on a long trip recently it drove at temperatures slightly higher than normal. Periodically I find some coolant under the car, almost as if the expansion tank is overflowing, but the fluid level is a little lower. After driving the fluid level is back to normal.
My questions are: what are the symptoms of a water pump about to go out? what about a thermostat or a pressure cap. I'm using the MB coolant and looking for signs of leaks (white crusty stuff) but not seeing any. It's making me uneasy to see the extra heat - I live in the Sierras and so I get to go up and down lots of mountains.
I'd appreciate anybody's comments that people have on this engine and car and any voices of experience.

Thanks Much,

Matt.

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-livin' in the terminally flippant zone