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The radiator fan should turn on when the a/c clutch engages as this is designed to increase the cooling of the engine as the a/c increases the engine loading. But the compressor clutch should stay engaged as long as there is need for cooling, and disengage/re-engage as the temperature control calls for cool air. The radiator fan will shut off IF the engine temperature is cool enough to do so, as it is regulated by heat, as well as the A/c override.
If your air conditioning is not cooling the car and the clutch is simply disengaging prematurely, have the temperature control and relay checked for proper operation. Also have the refrigerant level checked to assure there is adequate refrigerant in the system and no leaks. My first bet would be the relay or the thermostatic temperature control under the dash.
which fan? Interior fan, or radiator cooling fan? Is it the radiator cooling fan, or the fan controlled by the air-conditioning?
Run the vehicle, turn on and off the air-conditioning to identify which of the fans in the engine bay is the one triggered by the air-con and which is the primary cooling fan. If the primary cooling fan is permanently engaged, then first try replacing it's relay as it may have fused closed.
I would assume you have electric fans on your radiator. If you have air conditioning and it is on - then fans will run whenevr the air is on.
If you dont have air or it is turned off - and the electric fans start up immediately and dont turn off - then likely you have a stuck relay. Check your fuse area in the engine bay - there should be a series of relays. Check your fuse cover or service book for which one runs the fans. swap with another relay just to try. if they dont come on - bingo - go spend $10 and buy a new relay
First try replacing the Relay for the system. If that doesnt work check/replace the pressure and temp switch on the drier. The 124 body style have issues with A/C overall so dont be too frustrated. Also in the short term try turning the temp wheel to max cold (blue dot) and restarting the car. Sometimes it will force the relay and compressor to lock on while driving. Also be aware if your Aux Electric fans dont come on the system doesnt get cooled properly and will not stay on. Good Luck.
Is the compressor engaging and did it engage before adding freon?
What is the pressure on the gauge for the low side? 25psi to 45 psi is normal when the engine is running and the compressor is turning.
If the compressor is not turning the pressure should read 75psi to 100psi, before the compressor starts turning.
Also, the radiator fan should go on when you engage the air conditioning by turning it up to max.
Check your your radiator cooling fan should come on at about 220 deg. and off at about 210 deg. at idle with a/c off, if it stats to over heat turn a/c on, fan should come on right away, if it dont check voltage at fan motor, if you do have voltage, you have a bad radiator fan motor, more then likely the reason it don't over heat while driving is air is being push through radiator where it cool's the coolant before it goes back into the engine, at stop's no air running through and never cool's coolant .
good question, turn your defroster on, and see if the fan comes on then, if it doesn't then you may have a bad fan motor, radiator fans come on automaticly when the air conditioning compressor is engaged, this it to provide good subcooling for the pump, so if it doesnt come on with the a/c turned on and its not the relay, then its the motor, because the sensor was bypassed
If cold air is coming out in the back seat then your compressor and the rest of the system that circulates the freon is working. When you turn on the A/C for the front do you hear the fan come on? If so and if no air at all comes out the front then you might have an air valve stuck or a blocked air duct. I don't know how extensive the damage was from your crash. If you cannot hear the fan start when only the front A/C is activated then you have some kind of electrical problem.