I helping  a list member with mysterious disappearing coolant, I wondered if
everyone knew about the range of ultra-violet dyes for use in diagnosing
leaks.  There are dyes for the cooling system, oil, fuel, trans, even A/C.  An
ultra violet light is necessary (and fairly costly) so it may be out of the
range of the home mechanic, but if you're stuck with a mysterious leak, it
might be worthwhile to find a shop that uses U/V dyes, or convince your shop
to purchase one.  It's virtually foolproof-Hey, I've used it!-and can save a
lot of money in wasted time and repairs.   Patrick
no I dont have stock in the company.