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Idahome
Joined: Wed May 2nd, 2018
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The most you will find in the HVAC box behind the fan is a buildup of leaves and pine needles, they gather in the lower corner...super easy to clean out with your hands and shop vac.
I put the 4 seasons kit in my 97 F350, AC works like NEW!!! the orrofice tube was so clogged I could not believe it was still working before... I mean CHUNKS of black crap.
We just did my stepsons 98 Explorer with the 4 seasons kit also, now his AC works like new.
After you pull 30n of vacuum and hold it for like 45 minutes to an hour, then measure the amount of charge oil you add and the amount of R134 you add based on the hood sticker and it should perform like a new truck.
Now if I could keep the R134 from leaking out of the rear of the van and excursion we would be in good shape! The rear ac systems are a PITA there are like 150' of aluminum lines with STEEL fittings and O rings...fix one, next year another one leaks. Rear AC sucks.....
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks