Did mine recently, IIRC, I had to remove the glove box then it was pretty straightforward. AC didnt interfere, just unbolt the panel in the heater box and slide the old one out. I changed my coolant and added sca's when I did mine also.
92 F250 4x4 7.3idi zf5 3.55's Meyer plow
86 F350 2wd C&C Dump 351w C6 4.10s Meyer plow
The rest of my signature changed as to not offend some liberal crybaby.
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