Same thing happened to my 2003. check for leaks, filled with Freon. Put on system at garage today and its full, pressure is good no leaks. Probe says its the power head inside the car. I replaced with one from the junkyard. Ive check relays everything it comes on about 3 seconds and goes off. The clutch and compressor work fine with the probe.I was shocked to see my mdx ac not cooling;fan blowing. I want to personally find out what the cause is before I take it for repair. Every idea would be appreciated.