The electric fan for radiator failed the direct 12 volt test,, I have 12 v all the time when engine is on,,even with AC off,, I switched the relay too, still same.? Now buying new fan but dont want it to run all the time.. any thoughts. Phil

 

Remove the relay. Do you still have power to the fan?

Do you have power to the fan with the key off?

Disconnect the battery and remove the connectors from the PCM. Hook the battery up. Do you still have power to the fan?

 

From my own experience with doing the mk8 fan swap, the fan will be on anytime water temp exceeds 210 OR AC is on, plus ~30 seconds after AC is shut off. Mine also likes to kick on for about 2 minutes at first start, even with the AC off.

 

Relay pulled no electric.. ! no electric at plug with key off!
Temp was cold at time of all test... assume it will run 30 seconds after I turned off AC,, maybe thats the 12volt reading I was getting.. Had test bulb in fan connector... I will test again with new fan and watch if fan runs the 30 seconds after AC is turned off... Thanks for the tips.

 

kind of makes you wonder why they picked such a high temp for before the fan kickson??? slightly on the retarded side of thinking...lets see...lets put a 180 degree thermostat in it and then let it hit up to 210 degrees then cool it down to about 200 degrees....makes a lot of since to me

 

The electric fan is intended to supplement the mechanical fan, not replace it.

Under normal conditions the mechanical fan can easily handle the cooling load BUT not so if you're stuck in traffic at idle on a hot day.

It does help the a/c function better at low speeds as well.

 

stock thermostat is a 195. So the fan at 210 and shut off at 205 is not far out of line. (The fan shuts down 5 degrees lower than turn-on temp). With the 180 stat, I had hemifever turn mine on at 190, so it shuts off at 185.