Cooling fan trick
09-25-2007, 12:38 AM
#1
Burning Brakes
Thread Starter
Cooling fan trick
I've exhausted myself searching for thread containing a post with a trick to read the temp programmed to turn on the fan. You use the A/C up and down to find the setting. Can somebody help. 
09-25-2007, 10:59 PM
#5
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Member Since: Aug 2007
Location: Raleigh NC
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I don't think you can get the temp when the ECM will turn on the fans. But you can get the degree celcius reading that the ECM uses to monitor. The sequence is: (copied from a previous thread)
Hold down both the up and down arrows on the heater fan control for 10-15 seconds. The heater fan control display should go to 00 after you've held both buttons down long enough. Once it says 00, use the up arrow to cycle to number 16, then press the button with the picture of the fan on it. That should show you what the ECM is seeing for coolant temperature, in degrees C. The computer uses a different sensor than the dash mounted gauge, and the dash mounted gauge (at least the one in my 91) isn't very accurate.
Hold down both the up and down arrows on the heater fan control for 10-15 seconds. The heater fan control display should go to 00 after you've held both buttons down long enough. Once it says 00, use the up arrow to cycle to number 16, then press the button with the picture of the fan on it. That should show you what the ECM is seeing for coolant temperature, in degrees C. The computer uses a different sensor than the dash mounted gauge, and the dash mounted gauge (at least the one in my 91) isn't very accurate.
09-25-2007, 11:47 PM
#6
Burning Brakes
Thread Starter
I don't think you can get the temp when the ECM will turn on the fans. But you can get the degree celcius reading that the ECM uses to monitor. The sequence is: (copied from a previous thread)
Hold down both the up and down arrows on the heater fan control for 10-15 seconds. The heater fan control display should go to 00 after you've held both buttons down long enough. Once it says 00, use the up arrow to cycle to number 16, then press the button with the picture of the fan on it. That should show you what the ECM is seeing for coolant temperature, in degrees C. The computer uses a different sensor than the dash mounted gauge, and the dash mounted gauge (at least the one in my 91) isn't very accurate.
Hold down both the up and down arrows on the heater fan control for 10-15 seconds. The heater fan control display should go to 00 after you've held both buttons down long enough. Once it says 00, use the up arrow to cycle to number 16, then press the button with the picture of the fan on it. That should show you what the ECM is seeing for coolant temperature, in degrees C. The computer uses a different sensor than the dash mounted gauge, and the dash mounted gauge (at least the one in my 91) isn't very accurate.
