On my 2001, I hear a device periodically operating. Sounds like a vacume or compressor pump. What is it ? ...
Motorized Device
Feb 20, 2009
7 Replies
The water pump that stores the hot water from the engine after you turn it off?
Peter Granzeau wrote in news: snipped-for-privacy@4ax.com:
That didn't appear until Gen2.
Since the OP said "periodically" instead of "after startup", that pumplike noise might simply be the engine as it runs and stops. At speed, general noise masks it.
Brake pressure accumulator.
What is the ...
In a conventional car the brake booster is powered by vacuum from the intake manifold and stored in the booster chamber via a check valve. There is no guarantee the ICE in the Prius will run or have recently run when the brake boost is needed so there is a pump that performs the equivalent function.
Mike
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