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Found 3 results

  1. My 2005 C2S 997.1 has been sitting for a few months. It has been on a CTEK battery maintainer. I took it out for a one hour drive today. Just after engine startup, at the end of the drive, and another engine startup after a two hour rest in the garage (water temp gage showing about 120degF), it exhibited symptoms I'd not seen before. Immediately at startup with a cold engine, the engine compartment fan came on and stayed on. About 30 seconds after engine startup, both cold engine and warm engine, both radiator fans came on and stayed on. I have a Durametric and captured the following fault codes while the engine was running (I traversed every menu item on the left of app window): C140 C141 C131 C152 (I think this is due to the inactivation and removal of the PASM module when I converted to coilovers) 8004 8028 8029 8042 FWIW, I was not in ECO mode so the air conditioner compressor was probably running. I was trying to recirculate the freon and oil. (I usually run in ECO mode.) FWIW, there's no CEL indicator showing on the instrument display. Engine water temp about 105degF. Started engine. Engine compartment fan is on. Within 30 seconds both radiator fans roaring (seemingly like they are on high). Using Durametric, went to Front/Activations and found 3 "Radiator fans" (not sure why there's 3). See pic below. First entry - clicked STOP. Nothing happened. Second entry - clicked STOP. Nothing happened. Third entry - clicked STOP. Nothing happened. First entry - clicked START. One of the front fans (or maybe both, it got quiet) slowly spun down and then 10 seconds later it went back to high. Second entry - clicked START. One of the front fans (or maybe both, it got quiet) slowly spun down and then 10 seconds later it went back to high. Third entry - clicked START. Nothing happened. Toggling the ECO button on the climate control didn't seem to make any difference. Gas has Stabil in it. Battery's installation date is July 2014. Yesterday, after the battery-maintained multi-month inactivity, the car acted OK - normal starter rotation speed and fire-up time. Today, battery's voltage after sitting all night, NOT on the battery maintainer, is 12.67v. Why might these fans be acting abnormally?
  2. I'm trying to understand the outputs of the 997.1 cooling fan control unit. I understand that the fans are a continuously variable type and run in proportion to the cooling water temperature. How is the fan speed adjusted? For example, is the voltage adjusted by the control unit? Maybe 0v to get 0 RPM, to 12v to get max RPM. Or, PWM? I'm interested in using this info to add a manual override to be able to run the fan at max speed by a dash switch (but maybe needing some "smarts" if PWM is involved).
  3. Hello Porsche fans, I have just purchased my first 928 and she is a beauty. It's only been a few weeks. Now I'm doing what I love the most which is tinker and make it even more perfect. On a recent cruise, I noticed that the engine temp got really hot (after being idle for a minute or two). I was just around the corner so I went home immediately. The red light litt up as I pulled in the garage. I parked it immediately and turn her off. the previous owner mentioned that the fan should run even after you turn the car off and remove the key but no such thing happen. I also notice that coolant started dripping on the floor. I determined that it was just coming from the reservoir from the overheating. with that, I was confused because the fan didn't kick in. I took the car out again today and she seems to stay cool when running at speed (35mph or more). but once again would heat up when stopped at lights or driving at slow speeds. I could not hear the fan kick in at all. But I noticed something strange, the fan inside the car cabin would kick in on bust for about 10 secs randomly. At any point it would just blow at top speed even with the control knob turned off! what's up with that? this is my first 928 and I'm looking for some direction. I should also mention that the fan was changed to an electric one. Hopefully that doesn't complicate things too much. Any help is appreciated. Roch.
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