Quote:
Originally Posted by Gaz64
Drilling holes in the thermostat and no bypass hose is not the same as a normal thermostat with a bypass hose.
A normal system with a bypass (internal or external) allows fast engine AND heater warm up
WITH circulation prior to the thermostat opening point allowing coolant flow to the radiator.
The is no point in allowing coolant flow through the radiator in the warm up phase,
we only want circulation within the engine.
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The small hole you drill at the top of thermostat base plate is an air bleed not really a bypass due to minimal water flow.
We run a remote t/stat with bypass from engine side of t/stat back in to the bottom hose, this can be -6an or -8an or equivalent sizing.