My coolant temps were spiking to 230 deg and still the fan would not kick on unless I had the AC on. You are looking to see if the PCM sends power to one or both relays to turn on the coolant fans. @ Tallra1 I already checked the wirings, and its all in good shape, but i havent check yet the main thermo-switch. @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. Ac wasn't blowing cold air. The relay looks fine but do not have another similar one to try. Problem solved. The A/C does not blow cold air. The ECT sensor monitors the coolant temperature, and allows the fan to turn on if the coolant is too hot. 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. Step 4 – Check the engine coolant temperature (ECT) sensor. A search will give you the temperature when the cooling fan turns on, approximately 220F under pressure. Cooling fan wont turn on 6 Answers. Figure 3. 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. This should happen as the high side of the system approaches 214 psi. What could this be? If the fan does not turn on, you will need to replace it. The display inside the SUV says A/C on and the engine rpm does change when you press the A/C button. If I open the panel and spin the squirrel cage a little, it immediately begins to blow air and runs the heating cycle. Poor air conditioning performance. If the a/c doesn't run then the cooling fan isn't needed. Replaced the fan. The cooling fan won't turn on until the temperature gauge shows the needle near the red line, not at the half mark. Find an Air Conditioner Service Professional Near You. The temp between operating temp and fan is like 20 degrees apart, so yeah. That depends on the car. 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. Small cars typically have stacked AC and engine radiators cooled by a single fan. The reason being, on most vehicles, is that the cooling fan doubles as a condenser fan. The engine cooling fan does not turn on. I noticed my cooling fan stopped working and would only come on when I had the AC on. If the radiator fan is in working condition, move on to the next step. My thermostat signals the heater correctly and the burner ignites, but the fan doesn't always turn on. In stop n go driving you will have the fan pop off and on frequently. Radiator fan testing points. Fuse 31 is not blown. 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