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so yesterday I was reading and the vacuum booster controls the 4x4 and the ac and I was working with the switch controls for the transfer case and it engages just fine....my question is, is there a chance that it's just a vacuum leak or what could be my problem here? the ac is STILL only coming out of the defrost vents. does someone have a vacuum line diagram for a 2000 f350 so I can get my ac working before I leave to Florida in a few days?
No I think the vacuum pump only operates the shift on the fly hubs and the HVAC. The transfer case shifts with electric solenoids/motors. So if you don't have ESOF, your vacuum pump is only controlling your HVAC.
Did you verify that your pump is running? And that it is shutting off? It should cycle on and off. Mine started to run constantly for a couple days then it just died.
Are you sure you don't have ESOF? If you have a dash switch it sounds like you do have ESOF. Look closely at your hubs to see if they say "LOCK" and "AUTO"
2002 F350 4x4 Crew, coolant filter, 6.0 tranny cooler and ext. filter, pre pump mod & filter, Isspro pillar pod, EV-2 hpop & fuel pressure gauges, AIS, Marinco x2, door seal mod, netbook mount for AE.