Dual heat /Defrost question problem. | Ford Explorer Forums - Serious Explorations

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Dual heat /Defrost question problem.

pjw73nh

Well-Known Member
Joined
March 20, 2011
Messages
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Year, Model & Trim Level
08 LTD
I discovered yesterday something quirky about my dual heat system.

Assume for sake of discussion drivers side is set to 85,and passenger side is set to 60.

When in floor mode, Drivers output is 85 (warmer) Passenger is 60 (cooler).

When in dash/vent mode. Same thing Drivers dash/vent output is 85 (warmer) Passenger dash vent is 60 (cooler).

When in defrost mode, all defrost outputs are 60 (cooler).

In short, in defrost mode, the system appears to give temp priority to whatever the passenger side is set for.

This doesn't make sense to me. Can anyone explain the theory behind this, or perhaps test it out on their dual system and see if operates the same as mine.

Thanks.
 






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