You need to put it on dc volts. ****I forget, have you replaced the sensor already? **Use your ohm meter and check the resistance of the coolant temp sensor. I have the schematic at work. I think a low ohm reading indicates high coolant temp. If you have an open in the coolant temp sensor, your ohm meter will not read anything. Than your problem would be a bad coolant temp sensor. ** The reason the low temperature would turn the fan on is because the computer knows neg 39 degrees is an error so it goes into failsafe and turns the fan on. **Also use your ohm meter from battery neg terminal to the black wire at the plug, you should have 0 - 5 ohms resistance. If ohms is higher than 5 ohms than you have a bad ground on the black wire.
Wednesday, January 9th, 2008 AT 5:34 PM