Quote:
Originally Posted by TheTal0n
How can one avoid excessive heat the electronics..?
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Redesign the pump and take the electronics off the back of the pumphousing and place them nearby, say on the framerail so the steel chassis can act as a heatsink. That'd be my design.
The electronics run in an environment of 170 degrees Celsius. They are sealed in a chamber on the back of the pump (which faces the airflow of the radiator none the less). When I pulled my pump apart, the conformal coating on the electronics had vaporized and re-solidified on the interior walls of the housing.
The current design is totally asinine for long term reliability.
I see no advantage to use of an electric water pump other than to allow for quicker engine warm up (less emissions) and the resting heat function the early cars had. The pump is a $400 part. It's design allows for failure. If BMW wanted to have a pump that varied in operation then why not just put an electronic activated clutch on a belt-driven pump similar to how A/C compressors are operated.