Rapid cooling fan cycling - 1995 Chrysler Concorde

A low refrigerant charge would cause rapid compressor cycling. If your engine temp is rising with AC, check to make sure the AC radiator fan is running when AC is on

Fan Control The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure) to determine engine cooling fan needs.
For variable speed electric fan(s):
The PCM controls the fan speed and operation using a duty cycle output on the fan control variable (FCV) circuit. The fan controller (located at or integral to the engine cooling fan assembly) receives the FCV command and operates the cooling fan at the speed requested (by varying the power applied to the fan motor).


EDGE/MKX, FIVE HUNDRED/FREESTYLE/MONTEGO, FUSION/MILAN/MKZ, CROWN VICTORIA/GRAND MARQUIS, TOWN CAR: FCV DUTY CYCLE OUTPUT FROM PCM (negative duty cycle) FCV Duty Cycle Command (NEGATIVE (-) duty cycle) Cooling Fan Response/Speed Greater than 0 but less than 5% Fan off, controller inactive Greater than 5% but less than 10% Fan off, controller is in active/ready state Edge/MKX, Crown Victoria/Grand Marquis, Town Car:
10% - 90% Edge/MKX, Crown Victoria/Grand Marquis, Town Car:
Linear speed increase from 30% to 100% Five Hundred/Freestyle/Montego, Fusion/Milan/MKZ:
30% - 90% Five Hundred/Freestyle/Montego, Fusion/Milan/MKZ:
Linear speed increase from 50% to 100% Greater than 90% but less than 95% 100% Greater than 95% but less than 100% Fan off
For relay controlled fans:
The PCM controls the fan operation through the fan control (FC) (single speed fan applications), low fan control (LFC), medium fan control (MFC), and/or high fan control (HFC) outputs. Some applications will have the xFC circuit wired to 2 separate relays.
For 3-speed fans, although the PCM output circuits are called low, medium, and high fan control (FC), cooling fan speed is controlled by a combination of these outputs. Refer to the following table.
If you don't understand these thing's listed above your best bet is to take your vehicle to a qualified repair shop . Have the vehicle checked for DTC'S - diagnostic trouble codes !
If

There is a diagnostic connector under the dash board that is supposed to be left disconnected (green) if you connect then it forces it into diag mode.....

You could try the relays first, they are way cheaper. But probably the fans..

i have the same problem my 2001 pontiac aztek over heats cause the cooling fans wont turn on........they only turn on when i turn on the A/C this helps the engine cool down and the temperature drops on the gauge can n e one help me?

Sounds like your electric cooling fan(behind the radiator) is not functioning. The thermostat might not be working,making the fan
not come on at all. I once put a toggle switch in my dash,when I had
an old CRX, just to turn on the fan, or it would overheat.

The accy fan you are refurring to is actually the a/c consensor fan.The only time that fan operates is with the cycling of the a/c system.Verify by turning a/c on ,fan should come on & off with a/c cycles..

I had the same problem. I took my 2003 outlander into the mits. dealership and they told me there was a factory recall for some sort of relay or something for the cooling fan. they fixed it no charge. hope this helps.
darryl

Are U sore, that U must use freon in your cooling system?
I think the system use R 134 gas for cooling, with a special climate compressor oil.

i would deff check the relay i had a problem with my relay going out on my 04 but i just ran my fan to a togle switch so i can turn it on and off when i want it on when im in dead stop situations like traffic and also when your ac is on the fan has to be on or your ac will cut on and off to keep your car from really over heating in a hurry if your not moving, but i also run my car at the track and it helps to keep it cooler when racing down the drag strip.