1990 vw Corrado g60 210k miles. My car overheats because the thermo fan switch doesn't kick in at low speed. I bought a new termo switch and still th same. You start the car and temprature start rising untill 210 degrees Farenheit and then the fan kicks in. Is there a way to check the low connection to the thermo switch. My switch has 3 pins. Any ideas will be appreciated, thanks Joe.
mine does the same thing as well, just rises and rises til its overflowing from the res, then the thermo opens, fan kicks on coolant flows til its cool enough for the thermo to close and fan to stop and then it starts all over again. its quite messy. and thats with it just idling in the driveway.
mine also has three pins
Same here. I even went so far as to have Zeb get me a new fan harness from Germany, not cheap. New sensors (normal and low temp), new fan relay (fuse box #31 and engine compartment #53). I can jump the sensor, both fan speeds work. While driving however, fan only comes on when temp reaches the high end. Truly bizarre.
have you all checked the low speed fan windings? i had this same issue last summer. i did just like the rest of you and change the fan switch with no change. i changed the fan after run relay, still no change. it was only after i bought an aftermarket fan and wired it up that i got my issues under control. while i was in there, i also replaced the thermostat with a lower temp one. i run 175F all day long. the new fan was only like 45 doll hairs.