Did you charge it? If not it's probably low. Pull the low refrigerant sensor off the drier and make a jumper for the plug. If the compressor cycles, you are probably low on frig'nt. If you charged it, it could be over charged.
I know mine started smoking when turned on. If you checked all the fuses and the wiring going to it then like JAFO1 mentioned check the above.
04 F150 Heritage 4.2
94 F250 7.3 DI Turbo Diesel 5spd
4x4 ext cab 8ft bed 3in DP (Tymar), 6637 Poor Boy intake, 4in exhaust side exit after ext cab, Aero Turbine muffler non resonator, NO Kitty, DANA 60 Mod got rid of the TTB50
When the charge is just low you will normaly see the clutch cycle off & on, unless it is pretty much dead empty. jumping the switch is a good quick test off the electrical system. if the clutch kicks on, the switch is bad or system is empty. if nothing kicks on, it's time to get electrical. if you find the system is empty, I would suggest vacuuming the system out unless you are just checking for leaks. just pumping freon in will limit the preformance.
is there a way to check if the compressor is locked? Can you turn it?
__________________ Ian, 1 each (That's my nomenclature so don't wear it out) 97 F350 7.3L Auto 4WD Crew Cab 230K (Cali model bummer). MODS: HOOOOGA! horn, 6637, Service/Utility bed, 3" DP, Testing that Cat, 120v IDM. US ARMY OAS, OJE-IFOR, SFOR,2,5, OJG-KFOR, OIF, OEF. To ALL that have served, THANK YOU!
One more thing to think about before you call it low on coolant. The connector on top of the a/c compressor at the rear. It's a round 2 pin connector. That is a high fail part. Turn the a/c on max, high fan. Go out and wiggle the crap out of that connector. I bet your compressor will kick on.
If it does, the connection just needs to be cleaned and tightened up. You could take a chance and crimp the female connectors a tad, and hope for the best, you could replace the connector.
I just took the red lock out of the face of the connector, took a few 3/4 inch long strands of wire, bent them in a U shape, and put them in the female end hanging half in and out of the connector. Then reinstall the lock and it will hold the copper strands in place. That one strand of copper will make all the difference in the world, and you shouldn't have any more connection problem. Hope that helps.
Also if the compressor comes on while the low pressure switch is jumpered, don't leave the jumper wire in. It is protecting the compressor because you are low on Freon. No problem to use the jumper for troubleshooting purposes though.
97 F-250 PSD
2012 F-350 Cab/Chassis, 4wd, service body, HD front end
i dont mean to hijack your thread but i used this one to diagnose my own ac system that worked last summer but come spring it wasn't working, i jumped the low preasure sensor ac compressor kicked on so i bought some r134a and charged it to 45 psi now the ac works but it doen't seem as cold as it should be. if i bump the idle up to 1000-1500 the preasure drops down lower, my question is what psi should our systems be charged to?
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