radiator fans ?

[CoBeerToad]

I noticed I was running a bit warm and decided to test everything to determine the problem. I tested the fans by turning on the AC and both fans worked. Pulled the bumper and cleaned out the radiators (they weren't too bad). I changed the water pump, thermostat, and coolant. And I burped the coolant for an extraordinary amount of time. It was during this time that I got around to the front of the car with the bumper still off and I noticed one of the fans wasn't running. Kicked on the AC and they both kicked on at high speed.

I'm still undecided if I'm mad that I changed everything else or not. It was probably due anyway.

[thom4782]

When a fan doesn't run at low speed at all, the cause is often a failed ballast resistor on the non-running side.

[jacabean]

I have come to the conclusion that my system works properly . The system is not ideal for hot weather . no need for manual switches , just turn the AC on and the car cools back down to normal operating temps . It's a shame most people in my region put their cars away for winter . these motors love the cold and seem to make much more power in cold weather . last winter I had my box S on the highway running with an e36 M3 in extreme cold and I was shocked when i saw 138 on the speedo , motor felt so strong . not the same in the hot summer weather .

[jacabean]

I also found it best to use a power washer when you clean the radiators . My 996 radiators looked clean when I took the bumper off but after closer examination i found that about 40% of the surface area was clogged . compressed air and vacuum cleaning did nothing to clear the compacted dirt out .