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

san rensho · 06-23-2011, 03:14 AM

The low speed fan goes on at 103C, according to the climate control realtime diagnostic, and its supposed to go on at 97, so its switching on about 10F higher than it should. I'm not too worried since both fans run on high when the AC is on and here in Miami, I always have it on.

There are 4 relays that control the fans, I switched them all around (they are all the same) with no effect. I'm going to try to check the resistance of the fans at the DME connector, if the left varies significantly from the right, then I'm pretty sure the resistor is the fault.

06-23-2011, 03:14 AM	#3
san rensho Registered User Join Date: May 2011 Location: Miami florida Posts: 1,591	The low speed fan goes on at 103C, according to the climate control realtime diagnostic, and its supposed to go on at 97, so its switching on about 10F higher than it should. I'm not too worried since both fans run on high when the AC is on and here in Miami, I always have it on. There are 4 relays that control the fans, I switched them all around (they are all the same) with no effect. I'm going to try to check the resistance of the fans at the DME connector, if the left varies significantly from the right, then I'm pretty sure the resistor is the fault. __________________ Current car 2000 Boxster 2.7l red/black Previous cars 1973 Opel Manta 1969(?) Fiat 850 Convertible 1979 Lancia Beta Coupe 1981 Alfa Romeo GTV 6 1985 Alfa Romeo Graduate 1985 Porsche 944 1989 Porsche 944 1981 Triumph TR7 1989 (?) Alfa Romeo Milano 1993 Saab 9000