Compression Ignition Addict
Join Date: Feb 2009
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AC Compressor cycling????
Ok guys, i have an '02 250 7.3L the AC works and blows cold air but seems to be cutting out beyond the normal cycle that these units do. Here's what's happening. when driving and the AC is on at a certain point whether cruising or sitting idle the compressor clutch will disengage, will start blowing warm, then hot air but will never re-engage on its own. If i get on the gas and cause the transmission to downshift (whether it's out of overdriver, or anyother gear) MOST of the time but ... not all of the time ... the compressor clutch will re-engage and start blowing cold air again. Even if i turn off the AC then turn it back on this will not cause the compressor to re-engage again. IF i stop shut off the engine, turn off the ac controls then restart, it will re-engage and blow cold air again. But if i am driving either in town in stop and go traffic or on the highway and the compressor clutch disengages, it will never re-engage on its own.
This has been ongoing for about a year now. I have put gauges on the system multiple times and had others put gauges on and the system shows to be properly charged so there is not leak. I have changes the Low Pressure switch located on the Filter dryer.
i have not changed the high pressure switch yet mainly becuase of the price of the switch and logic tells me it's probably not the high pressure switch - because it re-engages after i get on the gas (essentially increasing the pressure)
But i am not sure and don't really know a whole lot about AC systems. Any ideas on what might be causing this? The only thing i can think of is either the High pressure switch, low pressure switch(already changed) and the Clutch itself.
thanks and i would appreciate anyone's thoughts to this
2002 F250 Super Duty 7.3L XLT Crew Cab 2WD
6637 DIY Air Intake
ISSPRO Gauges on Tripple A-Pillar Pod
Fabtech 6" Suspension Lift
18"x9" XD Rockstars W/35"x12.5" Toyo Open Country
Amp Research Powered Steps
Replaced Batteries, Starter and Waterpump
Zerex EC-1 Coolant
Sprayed Herculiner to Front Grill and Bumper
------ Other Mods coming soon -------
Phoenix PHP 6 Position Chip
4" Exhaust System
Larger Injectors - Either Stage1 160s or Hybrids
Hutch n' harpoon Mod