Mike, I had the same problem. First, make sure your cooling system is in
good order (not leaking, flushed with open cores, no head gasket leak).
I used a bottle and holder from a Triumph GT6. Works fine. The overflow is
collected and later gets sucked back into the radiator. I still have a 165
degree thermostat. Even though the heater becomes almost useless, the car
seems to go into thermal runaway above a certain temperature. Running with a
lower base temp gives me more headroom (the joys of analogue devices).
TeriAnn
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