Chrysler Repair: 1999 Chrysler Sebring JXI convertible, chrysler sebring jxi, amp fuse

Question
Mr. Finston, my wife has a 1999 Chrysler Sebring JXI Convertible with a 2.5L V6 engine. The problem she is having is that the car started running hot and the AC started to blow cold. I took a look and replaced a 40amp fuse for the radiator fan and then checked the car. The car radiator fan came on, and when I turned the AC on it blew cold for about 5-10 seconds, then the AC would start to blow hot and the fan stopped working. I re-checked the 40amp fuse and it was blown. I have also charged the AC system which shows good on the gauge. Pretty much I have tried this 3 times and the same thing happens with the fuse. Any help in this matter would really be appreciated.

Answer
Hi Daryl,
The 40 amp fuse powers both of the fan speeds, so presumably one or the other is drawing too much current. It may be that the bearing in the fan has too much friction. You could try to observe when the engine is simply running without the AC and the temperature of the coolant rises due to warm weather, if the fan blows as soon as it comes on (low speed) or when the temp rises further and the coolant temp then demeands high speed.  You might examine the fan motor to see if there is an opportunity to apply some oil to the axis of the motor and thus reduce the friction.
The cut off of the a/c is generally not related to the fan functioning (unless the pressure of the system gets too high due to a lack off cooling by the condensor), but rather to something related to the system internal pressure. The pressure sensor will cut off the compressor both if the refrigerant pressure is too low or too high. If may be that you have too much refrigerant in the system. You could measure the voltage on the black/light blue wire of the pressure sensor (pin 2 of its plug of at pin 42 of the pcm) to see if it is above 4.52V, which is the maximum votage that it will allow the compressor clutch to be activated. On the low pressure limit a voltage below 0.450V will also circumvent the actuation of the compressor clutch. Presumbly the cut off of the ac compressor is due to one or the other of those extreme low/high situations.
Roland