2003 f150 AIR CONDITIONER COMPRESSOR RUNNING ALL THE TIME
Hi, i have noticed thay no matter where i have the selector switch the compressor always seems to run. Whether it is on AC, Max AC or not. Even in the defrost position it makes that clicking sound and i can hear it cycling. i had completely forgotten about it until i recently bought a 2003 F150. Our company where i work buys F150's and that is where i first noticed it. Thank you for any suggestions.
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1991 Ford F-150 did not use a high pressure switch for the A/C. The clutch cycling pressure switch is located on the accumulator. The switch you are looking at may be from a different model or year if the compressor was replaced with a used compressor at one time. (which explains a lot about why you cannot figure out where to hook it up)
Most likely your problem is the same as mine, which means you have a crack in your air compressor therefore no matter how full you fill the freon it will always drain (or blow) right out. Solution - get a new air compressor. Try to find one in a chop shop junk yard type place if you can do it yourself.
Alternate problem - freon can lose its charge. You can take it to just about any auto store and get the freon charged up for about $70. If that doesn't fix the problem it is likely the compressor.
i have an f250 diesel. Same thing, shuts off after about 10 minutes and
comes on when it feels like it. Its not the cycling switch. I checked
the voltage at the compressor clutch and its 12v. I also, made a "new"
ground for the compressor. The black wire at the compressor is ground.
This didn't do anything, nor did checking the freon. It will also shut
off if you have run it for a while, turn the HVAC selector to off and
back on. Although it has power at the clutch (compressor) it didn't
come back on.. this is weird.. i think. I was sitting there trying to
figure it out and used my test like to "nudge" the clutch on the
compressor.. gave it a little "push start" and it came on again.. seems
it needs a new compressor? I will see what happens this weekend when i
try that. Also, the pressure and contamination switches, are open
circuits, that closed and predetermined settings, they are not tied into
the ground of the compressor, but "looped" thru the circuit.
If only the AC indicator light is on but you are still getting warm air from the vents, this is not an issue. Most newer cars run the AC compressor nearly all the time to prevent moisture accumulation inside the car. Without the compressor running, your windows may steam up and hinder your visibility.
Possible solution for susuns: turns out my problem was an improper freon charge. If your problem is the same as mine your a/c cools very well, but stops blowing air after about 20 minutes. If so, your evaporator core is freezing over and the ice is blocking air flow. Also after parking the truck water will continue to drip from the truck for a long time. To test this theory next time it occurs, switch the selector to vent and the fan to high. You should notice the air flow return within 5-10 minutes or less, however the air will still be quite cold due to the ice formed on the core. If all this fits your situation, take your truck to an experienced technician and have the freon pressures checked. My system needed to be charged a little on the high side to prevent the freezing up.
Hope this helps, capn0623