986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post

WindS · 09-29-2018, 04:37 PM

I've got the same issue where the blower fan doesn't work. I tested the fuses and swapped the relays. No difference.

I got to the fan and tested the voltage on the 2 leads to the fan = 12V. So the fan has to be toast right? So I install a new cheap fan and it doesn't work either. I confirm 12V.

I did a few more measurements. I get 12V at the 2 terminals and a 1000-ohm resistance. I've got no idea about the resistor value. 1K-ohm seems like it's likely in there to prevent the fan from going.

Logic says the new fan is bad too. I don't have a 12V power supply to test the old one. Can there there be something else wrong. Is this too much resistance. The fan should be getting 0.012Amps. Not enough?

Thanks.

09-29-2018, 04:37 PM	#20
WindS Registered User Join Date: Jul 2018 Location: Portland OR Posts: 4	Help with diagnosis, please.... I've got the same issue where the blower fan doesn't work. I tested the fuses and swapped the relays. No difference. I got to the fan and tested the voltage on the 2 leads to the fan = 12V. So the fan has to be toast right? So I install a new cheap fan and it doesn't work either. I confirm 12V. I did a few more measurements. I get 12V at the 2 terminals and a 1000-ohm resistance. I've got no idea about the resistor value. 1K-ohm seems like it's likely in there to prevent the fan from going. Logic says the new fan is bad too. I don't have a 12V power supply to test the old one. Can there there be something else wrong. Is this too much resistance. The fan should be getting 0.012Amps. Not enough? Thanks.