Quote:
Originally Posted by Mike Noc
TC from the feel of it I don't think that normal pump pressure will move the disc. So it is more for overtravel when the disc valve has shut but the thermostat needs to open further.
If the system overheats then steam could well force it open if it could escape that way.
Regarding the ball valve I'd say definitely used to bleed air from the system when filling, as the pump isn't self priming, and there is a vertical length of pipe below the thermostat that could airlock if the air can't escape. Once the pipe is filled with coolant pressure from the pump will keep the ball valve closed with the engine running.Mike
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Don't know if it's relevant here but one thing I remember from letures is that a centrfugal pump (which is what all car water pumps are) does not create pressure as such. It just thrashes around in the water until there is no impediment to flow. Completely different to a positive pump