cooling fan doesn't turn on when ac is on

If you use the ac it will run on low then as the engine needs cooling it will burst into high speed and back to low as needed. I noticed my cooling fan stopped working and would only come on when I had the AC on. Step 4 – Check the engine coolant temperature (ECT) sensor. If the fan does not turn on, you will need to replace it. Ac wasn't blowing cold air. Then it goes to the radiator. Figure 3. If it exceeds this amount of pressure and the system doesn’t turn on, one of the sensors in the system that the PCM uses to know when to turn the system on and off has failed. The ECT sensor monitors the coolant temperature, and allows the fan to turn on if the coolant is too hot. The engine cooling fan does not turn on. A faulty cooling fan relay can also negatively affect air conditioning (A/C) performance. That depends on the car. You are looking to see if the PCM sends power to one or both relays to turn on the coolant fans. Cooling fan wont turn on 6 Answers. @johnblack I checked it while it is on cold state, but then when turn the AC ON the Radiator Fan turn on, so I let the AC ON while i drive my car, after 30mins driving if i turn the AC OFF, the RADIATOR FAN still dont work, even the Radiator Temp was hot. If the radiator fan is in working condition, move on to the next step. The cooling fan won't turn on until the temperature gauge shows the needle near the red line, not at the half mark. If I open the panel and spin the squirrel cage a little, it immediately begins to blow air and runs the heating cycle. Fuse 31 is not blown. The compressor clutch does not engage. Replaced the fan. The relay looks fine but do not have another similar one to try. Radiator fan testing points. My thermostat signals the heater correctly and the burner ignites, but the fan doesn't always turn on. Photo: an electric motor using a pulley and belt to drive the fan in an air … If you have a situation with a central air conditioner fan not working and you have exhausted the troubleshooting steps outlined previously, it’s time to schedule an appointment with a certified HVAC technician. Find an Air Conditioner Service Professional Near You. Problem solved. Fan ran and ac was cold for two weeks. This should happen as the high side of the system approaches 214 psi. When the A/C is turned on, the fan moves air across the A/C condenser, thereby removing heat from the vapor refrigerant inside. The temp between operating temp and fan is like 20 degrees apart, so yeah. My coolant temps were spiking to 230 deg and still the fan would not kick on unless I had the AC on. The A/C does not blow cold air. The reason being, on most vehicles, is that the cooling fan doubles as a condenser fan. @ Tallra1 I already checked the wirings, and its all in good shape, but i havent check yet the main thermo-switch. Found out the cooling fan wasn't running when the ac was on. If the a/c doesn't run then the cooling fan isn't needed. Temp was getting way too hot. I have a similar problem and cannot find my specifics after doing a lot of research and forum reading, so I hope someone here could help me. The display inside the SUV says A/C on and the engine rpm does change when you press the A/C button. Poor air conditioning performance. What could this be? In stop n go driving you will have the fan pop off and on frequently. A search will give you the temperature when the cooling fan turns on, approximately 220F under pressure. 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