HVAC box differences

[big66440]

I'm hoping you guys can help me with figuring out the differences of the HVAC boxes under the dash (heater core boxes) for MJ's and XJ's through the early 90's. My MJ is an 89 and I have access to a 92 HVAC box out of an XJ and a factory Mopar 1991 XJ Evaporator core. My question is will the combination of these parts work in my MJ? thanks   

[jdog]

bolt in, yes, not sure about wiring

[eaglescout526]

The only difference is AC vs no AC. AMC and Mopar used the same box for the AC system from 84-96. Now the parts catalog says some part modification is required and that is true. I have a 92 air box in mine and I had to drill some holes for it to use and bolt the Renix thermistor. The heater core side remains unchanged for 84-96. 

[ghetdjc320]

Just FYI, I used the newer plate and fin evaporator from the 97+ XJs and retrofit it into the hvac box with great success. It’s a better cooling core than the tube and fin style. Also, team Cherokee is closing out new tube and fin evaporators