This is a fairly common issue with these cars. The fan will work in high speed mode when the A/C is turned on, but low speed never kicks on. I've heard of people jumpering it and getting low speed to kick on, but that's only while testing it. Up until a few weeks ago, nobody had a remedy except for hard wiring it to a switch and manually turning it on from inside the car. Then someone figured out a way to bypass the ecu and it functioned normally. Then... member "Noneone2" figured the whole thing out! It's the high speed relay. I know, why would the high speed relay be bad if the fan operates in high speed and not low speed? Because a faulty high speed relay leaves a circuit open on the low speed side that prevents it from operating in low speed mode. Here's his explanation:
Quote:
| Originally Posted by Noneone2 CJ, Just an update on the low speed fan issue. Reader's Digest version; the high speed relay was the culprit.
After studying the wiring schematics, in the Bentley, it shows the if the high spd. relay doesn't function properly it leaves the circuit open to the low speed side. |