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-   -   Coolant flow, please comment (http://www.peachparts.com/shopforum/diesel-discussion/326147-coolant-flow-please-comment.html)

jay_bob 12-14-2013 02:01 PM
The operation of the valve is backwards from the washer or dishwasher.
Energized = block, de-energized = pass.

This is done for failsafe purposes. Total system failure = max heat, max fan, default to defrost. That is because all other system functions are comfort based but defrost is safety based.

scottmcphee 12-14-2013 06:33 PM
Quote:
Originally Posted by jay_bob (Post 3254462)
The operation of the valve is backwards from the washer or dishwasher.
Energized = block, de-energized = pass.

This is done for failsafe purposes. Total system failure = max heat, max fan, default to defrost. That is because all other system functions are comfort based but defrost is safety based.
Typical Benz thinking, logik.


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