Out of nowhere, the blower motor on '92 240 has stopped working. Neither speed switch nor AC toggle (usually automatically turns on to low speed) will activate fan. Fuses 3 and 12 appear intact. ALLDATA mentions a blower motor relay, but nothing as to location. Only related relay with location shown is the AC relay behind center console near bottom of pass side. Does power to switch control also go through this relay, making this the likely problem? Any test other than replacing? Any place else to look for solution? Thanks.
Power from the key goes to the A/C relay that when switched on applies power to the resistor block allowing #1 speed when the blower switch is off. Power from the key travels directly from the switch to the resistor block, to the motor. The spped is controlled by which wire grom the switch provides power to which resistor stack to allow each of the possible speeds. #4 speed is direst to the motor. It sounds like the motor has gone belly up. Everything you need to gain access to is enclosed in the heater box. Bob
That's definitely not the answer I wanted to hear (though clearly may be the correct one and with your wiring description, not really any other options). I've been driving 240s for many, many years and have never had a blower motor go without first living through months, or even years, of noise. Is there any other possibility at all? '92 and '93 were a bit different than former years. And, again, ALLDATA lists a specific "blower motor relay" but without any further description. Thanks.
Looking at the wiring diagram, it looks like all lines (direct as well as AC relay delivered) run through the fan switch on way to blower motor. If plug to back of switch is pulled, would no blower power under all conditions result??
Looking at the wiring diagram, it looks like all lines (direct as well as AC relay delivered) run through the fan switch on way to blower motor. If plug to back of switch is pulled, would no blower power under all conditions result??
It's easy to check, find the wire going to the motor and measure the voltage on it with the fan turned on, if you get 12V and the motor isn't running then the motor is bad. I found that replacing it isn't really as terrible as I would have thought, I did it on my mom's 240 last year and while it took me about 4 hours, a good portion of that was trying to get the stupid blower wheel off one side where it had stuck on there really firmly.
