Does anyone know if the radiator fans are single or multi-speed? Today the temp outside was 96 degrees and i left my car running the A/C while i went inside a store. When i came out, my engine temp was about 220 degrees and that'* the highest i've ever seen my temp gauge since i've owned the car. The radiator fans appeared to be turning too slow and not pushing much air. Voltage, coolant level, oil pressure are all fine. It took a few miles of driving the car in the air to cool the motor back down to 200.
The cooling fans operate at two speeds: low speed (fans in series), and high speed (fans in parallel). There are three fan relays that are controlled by the PCM to operate the cooling fans. Low speed operation when engine coolant temperature exceeds approximately 223 degrees, high speed 234 degrees.
I thought both fans only come on when the a/c is on, therefore, you're using only one fan unless the a/c is on. Today i notice my SES light come on and stay on, a/c is off, engine running warmer than normal and i open the hood and both fans are going, but like i explained earlier in this thread, they're turning probably at their minimum speed and not pushing much air. Not a good thing for summertime. :(
I thought the fans both turned on at low speed at some temp point and both fans were on if the AC is on. Then when temp reached a certain point the one fan goes onto high speed while the other fan continues at low speed--its only speed.
Is it possible the wind was blowing away from the car making it harder for the fans to pull a large volume of air through the radiator? I take the wind into consideration when parking and leaving the motor running for my passenger'* comfort. I leave the AC on lowest blower setting to minimize the heat load on the condenser coil in front of the radiator.when I do leave motor running. That doesn't happen as much these days with gas prices what they are.
Dual auto air on both