On both of our Redlines: The fan will not turn on, unless sitting at idle for quite some time and engine temp gets up to about 210-220ish (and typically even sitting at idle won't do it, unless it is very warm outside. Or after some spirited driving, then the fan will kick on when sitting at idle) Or if you turn on the A/C. Typically when driving, the amount of air passing through the radiator will prevent coolant temp from getting high enough to command the fan.
This is the easiest way to check and see if the fan is cycling correctly. Open the hood. Start the car. Observe the fan with the A/C off. Assuming engine temp is still below 210, then fan should not be on. Then turn on the A/C and the fan should immediately turn on: the fan is automatically commanded as part of the A/C control circuit.
If you can observe the fan being commanded by the A/C turned on: Then do this test: After the car has sat idling and temperature has gone up above 220 and pushing 230. And you open the hood to see the fan is not on: Then turn on the A/C, if the fan comes on and your coolant temperature goes down. Then you know the fan is working but something is wrong with the fan command circuit for temperature command.
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Last edited by GS Stage 1; 01-06-2013 at 02:43 PM.