Ford Super Duty (1999-2016) :: 2002 - AC Clutch Cycles On Max Settings
2002 - f250... I originally posted this issue in July of '03. Nothing has changed.
1. At max ac, regardless of how hot it is, the ac clutch cycles due to low pressure once the cabin temp reaches about 78 degrees. This is not acceptable or expected in my opinion.
2. I have run extensive tests, done this for years, and the conclusion is that there is too much pressure drop in the evaporator. I'm seeing 5-7 psi drop measured using a Fluke digital temp probe, insulating the probe tip around the pipe. Compare outlet of orifice tube several as far away from orifice as possible and comparing to outlet temp of evaporator where it comes out of the plastic shrowd. Convert temp to pressure.
I've seen many posts over the years of people not happy with '99 to '04 ford truck ac operation at cruising speed. I have confirmed that the compressor is cycling way too much to cool the cab down. I even ran an experiment where I completely blocked the condensor to raise the head pressure and the compressor still cycked at 1500 rpm's with the cab above 75 degrees on a 90+ degree day.
My next step is to blow out the evaporator and see how much oil and junk I get out of it. I'm also considering taking the evaporator out and trimming the rubber gasket that is around it. It is blocking about an inch of the coil face all the way around.
My conclusion still is that the evaporator just isn't loading up enough as if it's partially clogged. There is only about 2 psi drop between the outlet of the evaporator and the compressor.
The compressor cuts out at 21 psi so the low pressure cutout switch is working properly.
What should I use to flush the evaporator out? Will mineral spirits do it as long as I blow it out real well and make sure I get all of it out? Also wondering if I should blow out the condensor thinking maybe there is something clogging it up.
In spite of some folks on this forum saying it is normal for the compressor to cycle at cruising speed, that is a correct statement depending on many factors. In my case, the cycling is not normal or expected. I have also tried:
1. VOV
2. Larger orifice
3. 14 oz charge over what the sticker says
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