Just
a couple of things I figured out the hard way. First of all, on
overheating: If the heater is on when the engine is running hot, and
the condition of the heater valve is at all questionable, it is not
advisable to turn off the valve. As long as the heater core is included
in the coolant's flow, the car will run cooler, but if there is hot
coolant in the heater core, and the valve is shut off, the coolant in
the heater core will contract, while the coolant in the radiator
expands. This can cause the heater valve to leak onto the distributor,
shutting down the engine. The solution is to replace the valve, or
install a distributor waterproofing kit, both of which are preferable
to being towed home on the nicest day of the summer.
Steve Close
San Francisco, CA
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