Searched but no answer: Should a 944 S2 radiator fan run all the time while driving?
10-31-2017, 12:44 AM
#16
I have seen that switch before but I’m not convinced of the reason given for it in that post, I suspected it had something to do with emissions. If it measures intake air temperature like it says, how would switching the coolant fans on affect the air temperature in the intake? Maybe I’m missing something, a wiring diagram would confirm what it does, my knowledge of the 16v cars needs brushing up on.
https://www.manualslib.com/manual/39...age=150#manual
Looking at the wiring diagram, it seems that it taps into the AC input to the fan relay, as there is a diode at B/27 (4-valve only) I presume preventing back feed to HVAC control
10-31-2017, 08:59 AM
#17
Nordschleife Master
A/28 there is a switch described as "switch intake pipe cooling, only 4-valve version" and is triggered at 42 degree C.
https://www.manualslib.com/manual/39...age=150#manual
Looking at the wiring diagram, it seems that it taps into the AC input to the fan relay, as there is a diode at B/27 (4-valve only) I presume preventing back feed to HVAC control
https://www.manualslib.com/manual/39...age=150#manual
Looking at the wiring diagram, it seems that it taps into the AC input to the fan relay, as there is a diode at B/27 (4-valve only) I presume preventing back feed to HVAC control
10-31-2017, 04:49 PM
#18
The “AC” terminal on the coolant fan relay receives 12v when the AC is on and as that intake pipe cooling switch is also in the circuit so it also receives 12v at the same time. I cannot see what it does with it when it reaches 42 deg C and closes but it’s not turning on the fans.
Last edited by aussie944cab; 10-31-2017 at 05:07 PM.