I have a 2009 F-150 and the AC Compressor Clutch kicks on, that off again. The VIN # is 1FTPW12V69FB49597. I had the compressor, condensor and expansion faluves replaced which did not fix the issue. The machinic and also Ford dealership states the issue is there is no power to the compressor and the HVAC Control Module is the issue. The Ford Engineering number = 9L3Z-41980-YA. Model number = 9L34-18C612-YB. These are obsoleted by Ford and none available in any junk yards. The mechanic tried another unit where the only difference was that unit had cooled seats and mine does not. Mine has dual dirver/passenger controls, no navigation, heated seats, rear window defrost, NO COOLED SEATS. I am not convinced it is the HVAC control module since the module does kick the AC compressor clutch on, but than it turns off. The scan tools does the same, and the other used unit does the same. The pressure switch is new, and the unit is reading proper external tempature so it does not seem llikely to be the temp sensor in the dashboard.

Basically, my Ford is obsolete if there is no AC in Florida. I have been driving F-150's for 30 years, but would not consider another if a vechile is obsolete because an AC cannot be repaired.

 

How long does the compressor clutch stay engaged before it disengages?

Do you have any idea of the pressures , hi and low side when the clutch engages?

 

The clutch only engages for 2-3 seconds. The mechanic said the pressure is good and holds pressure; however, Ford said it was 1/2 pound low about 36 hours after the mechanic said it is holding pressure.

 

Someone might have to add a leak detect or a sniffer to aid in solving. Minor leaks can be tricky to find. The missing refridgerant came out from somewhere.

 

There are inconsistent pieces of info here.

We need to know ,for sure, what the hi and low side pressures are before offering any suggestions.

Can you get this info ?