Garmaine asked 4 years ago
Some engines nowadays have a switchable water pump that can be turn off at cold start, like the ones found on some Volkswagen diesel engines. Those a mechanical pump that can be disabled at cold start in order to shorten warming up time. At least, that is the marketing claim. Those engine still have a regular thermostat.
Any idea, if those pumps really make a difference concerning warming up time ?
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