Ok - I recently started to experience A/C problems on my 97 Dakota SLT 5 speed 3.9L V6. The A/C will run fine for 5 - 10 mins and then blow hot air. When it is working is blows ice cold. I had the system checked and there are no leaks and the pressure is fine at 175 high 30 low. Now I replaced the A/C relay in the fuse box and the A/C clutch cycling switch as I noticed that when the unit was blowing hot air none of the lines where frozen but he clutch was not engaged. This did not solve the problem Any ideas?

Thanks