986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Drivers side radiator fan only runs on high speed.

shlim8 · 06-22-2011, 06:24 PM

I have a similar situation - I'd posted a thread on this too and to be safe, I'm going to replace the driver side (passenger side for me as RHD - but same side as yours) series resistor. There was some debate on whether both fans were supposed to run at low speed when the a/c is off, but no definitive answer.

I've also asked a couple of independent mechanics and they weren't sure if it's normal or not.

When only one fan is on (a/c off or a/c on but compressor off ??), the temp can go up to 92-95 degree C (probably closer to the end of 0 on you 180 mark), technically not overheating yet, when both on, the temp is only about 82-85 C).

Is your temp similar ?

Please let me if you do get both your fans to come on at low speed with a/c off. My series resistor should be arriving sometime next month, so will only be installing it then. Will let u know if that changes things.

06-22-2011, 06:24 PM	#2
shlim8 Registered User Join Date: Sep 2010 Location: Singapore Posts: 228	I have a similar situation - I'd posted a thread on this too and to be safe, I'm going to replace the driver side (passenger side for me as RHD - but same side as yours) series resistor. There was some debate on whether both fans were supposed to run at low speed when the a/c is off, but no definitive answer. I've also asked a couple of independent mechanics and they weren't sure if it's normal or not. When only one fan is on (a/c off or a/c on but compressor off ??), the temp can go up to 92-95 degree C (probably closer to the end of 0 on you 180 mark), technically not overheating yet, when both on, the temp is only about 82-85 C). Is your temp similar ? Please let me if you do get both your fans to come on at low speed with a/c off. My series resistor should be arriving sometime next month, so will only be installing it then. Will let u know if that changes things.