Wayne Boudreau said:
Ok thanks for the replies. the fan does not work on low setting 1, 2, 3 but the highest setting no 4 it works but the air conditioner light goes off as soon as you turn it on high.? that's the light on the ac on off switch push button. The fab on low the air vreated while driving will give some cool air so I know the ac is working and every so ofyen I will give the fan a shove to high but the cool air does not last since the ac turns off???
Ok, quick lesson on VW A/C controls. The power signal to the ECM and fan module (both which have a say in engaging the a/c compressor or not) comes from the blower motor circut. That way the compressor won't engage if the blower fan is turned off (bad things for a/c freon pressures
).
Fan not working on 1, 2 or 3 but works on 4 = resistor pack is source of problem. High speed (4) is the only speed that does not use a resistor. As for why the light goes out when the fan comes on - I would guess there is a ground problem either for the blower fan or the a/c light.
UPDATE: Depending on which resistor in the pack blew - the a/c circut will not be supplied with power. The light in the button and the signal to the ECM/Fan module comes off the low speed (1) circut between the blower switch and the resistor pack. For the blower fan to work on high (4) only the las resistor would be blown. So soon as you turn the switch to 4 you effectively complete the circut to the blower fan and cut the circut to the a/c.
Remember this is the same as diag over the phone
. A GUESS AT BEST!
Jason
PS; I can post a page out of the wiring diagram if it helps.