Originally Posted by tbaxleyjr
First, I would make sure there is enough refrigerant. Alsio make sure your manifold gages has the adaptors for a 134a system.
A compressor cycling that often first off tells me that you probably have lost your refrigerant charge. The compresor will engage and the low pressure switch says "hey wait, I haven't got any/enough pressure in my lines, turn me off before I burn up!!" Think about it methodically........you have a compressor that is getting power to the electromagnetic coil pack causing engagment of the clutch. Then you have some entity causing disengagment. What would do that rhythmically every 3-5 seconds? If the low pressure switch was bad, it would not engage the compressor at all most likely. But rapid cycling, I bet you a dollar to a doughnut that you have blown a leak and have little/no r134-a in the system. Check it out and let us know. Hook up your gauges to the high and low service ports with engine off and read the static pressure and see if you have anything. With a 3-5 second compressor running, you wont be able to get a "system operational" reading. You will have to go by static pressure with compressor off.
This is the most likely scenario. Also a refrigerant OVERCHARGE condition migth cause this too but HIGHLY unlikely and you did not say anyone serviced th system recently. Most switches are either on or off....they are not a "ok I am close-circuited, oh wait, open circuit me, ok close me, ok open me" kinds of switches that would cause cycling so rapid of the compressor. It just depends on the type of a/c system in that car and how it is electrically wired up. I "think" ford used the CCOT system but I am not sure that is the system in that car. I would have to look more into it. DEFINITLY check the refrigerant pressures. Hope that helps.
2006 Mazdaspeed6, 2002 Pontiac Trans AM Ram Air WS-6, 1996 Jeep Cherokee Sport 4x4, 2002 Durango 5.9 R/T, 1995 Jeep Cherokee Sport 4x4, 1994 Ford Taurus SHO 3.2L, 1976 Buick 225 Limited, 1992 Miata, 2008 Miata.
Other toys: 2003 Honda Superhawk 996 sportbike, 2007 Suzuki M109R cruiser, 2006 Kawasaki KLR 650, 1996 and 1997 Sea Doo GSX limited watercraft.