The front right radiator fan on my 2009 Cayman S started cycling on and off in the high fan mode. I had heard the fan kick on in the high mode in the past during our hot southern California summers after parking my car but never noticed it in the moderate temps we experience this time of year. The fan started turning on in the high mode for about 30 seconds then off for about 10 - 15 seconds then back on again for about 30 seconds repeating the on again off again cycle. I also observed it would kick on well before the temp gauge was up to normal operating temperature. I let the car warm up and it never went above normal operating temperature. I checked the oil level - it was normal. I then let the car cool off and checked the coolant level which was also normal.
My car is still under the CPO warranty so I took it to the local Porsche dealer for further inspection. The tech determined the front left radiator fan was not turning on and he figured the front right radiator was kicking on in the high mode to compensate. He then noticed a small pebble had lodged itself in the front left fan blade preventing it from spinning. He said my front left tire must have picked up a pebble and managed to send it flying through the vent opening in the front left fender lining (see photo) lodging it in the fan. Once the pebble was removed both fans operated normally and no damage was done.
We have a driveway that is paved with pea sized pebbles. Plus, I track and autocross my car. Sometimes you come across small rocks or pebbles on the track and you do what you can to avoid them. I have the Zunsport grill covers protecting my radiators on the front of my car. As an added measure, the tech suggested I could cover the vents in the wheel fender liner with a screen to prevent pebbles from entering as well. Makes sense.
Looks like it would be a pretty straight forward job. I can either attach a screen in the wheel fender liner over the vent which is visually less attractive or remove the wheel fender liner and attach the screen over the vent from the inside of the wheel liner where it will be less visible.
I am curious, has anyone gone to the trouble of fashioning screens to cover the wheel fender vents? Thoughts? Cheers.