A/C Fluctuating 2016 Expedition

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regjwl

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My AC when on high will blow high, then low, then medium, high, low, high, medium, etc. there’s no pattern. I have replaced the blower motor, the blower motor resistor, and wiring harness. It didn’t help anything. Any suggestions? Thanks in advance.
 

sthomp99

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There are several of these threads. I am experience similar trouble with 2016 XL. Blower powered with ignition ON (HVAC: Off), Relays Good, Blower "Resistor" Good. Work around for now is grounding blower ground (Now Blower: High with Ignition ON). Problem is likely CCM25 the HVAC Control Module. No luck sourcing $200+, salvage yard next... Wiring diagram found here on another tread... The Climate Control Module (CCM25) takes in all buttons inputs and outputs to all relays, speed controls, blend doors etc.
 

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