@ Question About the air conditioning

Replace the fan switch, WBMA.

mike hunt

m wrote:

Mike,

What does WBMA stand for? Would be my assessment?

Close enough, advise was what I meant however. ;)

mike hunt

Ray O wrote:

You could have dirty contacts. Much easier to guess dirty contacts, rather than a burnt out resister.

Check there, you might need the switch replaced.

hth,

tom @

Thanks!

I am not clear.

The A/C and the Fan Speed are not related.

If you turn the fan speed selector from OFF, it should start on LOW, then go to MED, then HIGH. It should do this without regard for the setting of the A/C.

If the Fan works at all of the various speeds, but the A/C only works when the Fan is set to HIGH, then I am not sure what the trouble is.

But if the Fan itself only works on HIGH, then there is a resistor pack that has failed and needs to be replaced.

While dirty switch contacts and a burnt out resistor can theoretically have the same effect, in practice contacts that are getting dirty will gradually deteriorate, at first only occasionally fail to connect well (until the switch is wiggled or moved slightly), then making intermittent or poor connections with increasing frequency until they eventually cease to ever connect. It's extremely uncommon for contacts to one day be clean enough to work properly and the next day be dirty enough not electrically connect at all. In addition, this case involves multiple switch positions that do not work at all but one that works normally. The odds of a few contacts in a switch suddenly going bad at the same time but one or two being preserved are very low. Furthermore, the one position that works, the fan high position, is the one that would work with the resistor pack blown. Therefore, if I understand the problem correctly (and I am assuming that the symptoms appeared all at once together), the cause is almost certainly the resistor pack and not the switch.

Stephen