I use my 300 only for trackdays, i have the ac deleted, but the fan is still in place i beleive it will come on if the car goes to overheat

is there an easy way to get the fan to run constantly without having to rewire it to a switch?

Would like to use it for added cooling better safe than sorry

any easy way to do this?

I think you can just disconnect the yellow connector from the top aluminium water hose.

Front and center of engine as you look at it.

I think you can just disconnect the yellow connector from the top aluminium water hose.

Front and center of engine as you look at it.

 

Il try that and see thanks

disconnecting that "yellow connector" is your CTS (Coolant Temp Sensor). Your ECU relies on it to know what temp your coolant is at.... hence not advisable.

A bit of investigation is required (by you, as I'm too lazy to do so).

Firstly- locate the Relay for the AC Fan. It will be in the relay block on the passenger inner guard. Pull the relay and test the contact side of the terminal with ignition OFF. This will ascertain if the relay contact is constantly 12V supply or switched via the ignition.

 

*IF the terminal have 12V only when the ignition is on, then you can proceed with this suggestion*

 

Secondly- As the ECU controls the fan via grounding of the earth side of the Fan Relay Coil, you should be able to fit a diode between this wire and ground, with the stripe end of the diode facing the ground. Ultimately, this will create a permanent ground circuit for the Fan Relay, thus running the fan constantly, without completely isolating the ECU control of the fan, so, in the event of your diode failing, the ECU can still control the thermo fan.

 

The schematic drawings in the service manual will help to identify the wire colours for the AC fan (2 speed for TT and single speed for NA)

I pulled the yellow connector and the fan came on when i started the car ran it up to temp the turned the car off and the fan switched off when car was turned off

seems ok to me

You will confuse the crap out of your car pulling the ECU temp sender, it decides when it's safe to adjust timing, fueling and I believe even boost. You will either have to do it properly or not at all, it does come on after a certain temp anyway.

Oh il leave it alone so

I wouldnt of done any damage running the csr with it unplugdd would i?

I wouldnt of done any damage running the csr with it unplugdd would i?

 

No, none at all for that brief time. Don't worry about it, at least it proved the fan is good!

Thats grand all i did was run it up to temp then pulled it out the driveway onto the road

il put the yellow connector back on so

I didnt know tt/na use different fans maybe i put a na fan on my tt as it had a different desgin of plastic shroud caseing on the repacement .