Will it hurt anything using pre 18 hvac module in a 2018?

[et todd]

Running a 15 8.4 in my 18 because of the crap over the air uaq update. Anyway I have full travel hot to cold on the blend door actuator. But on the display it's not a smooth transition is goes like normal then jumps to full all at once.I know some that have used uaq's in older vehicles theIrs did this and swapping out to a 18 module fixed it.was wondering if the reverse would work for me.but I thought i read about 18's having a different variable speed ac compressor or was that the difference between 2500 up trucks and 1500's.I don'the won't to screw my compressor up.

 

[et todd]

Well the older module worked with the older radio as I suspected. So far so good on the compressor.

 

[Mpgrimm2]

* 14-18 ram 1500's have a variable displacement compressor (typ. associated with the 7 speed fan)
>> 14-17's = 68268186Ax HVAC module
>> 18's = 68366552AA HVAC module

* 13-18 ram 2500/3500's (& 13 Ram1500) have a fixed displacement compressor (typ. associated with the 4 speed fan)
>> 14-17's = 68105017Ax HVAC module
>> 18's = 68366553AA HVAC module

& Need to match the HVAC module to the 8.4 radio year.

M² Mods.