front blower motor stops when hatch is opened

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OG POPS

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So in my 2013 Expy the front a/c blower goes to the lowest speed when the rear hatch is opened or shuts off. Shut the hatch and restart the car and the a/c and blower work fine. Is there an interlock relay somewhere that kills the blower when the rear hatch is opened? Rear a/c works fine. I have already changed the blower resistor about 4 times over the life of this car. Anybody got any ideas?
 

JamaicaJoe

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It could be to prevent Carbon Monoxide from being drawn in. I found the rear wing windows don't open with the engine turned on. Ford had lawsuits regarding CO poisoning from police utility vehicles so could be intentional design.
 

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