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Re: Blower fan on 1983 240D.
This fan is pretty easy to replace. The reason it operates intermitantly is because the brushes are nearly worn out. It's doubtful that you can find replacement brushes, try googleing it, so if you can, it is a cheaper fix. Remove the underdash cover from the passenger foot well, should be 5-6 screws. You'll have access to the blower box, remove that. another 6-8 screws. once off , the fan is directly exposed. The fan itself has I believe 3 screws that hold it inplace with a plug-style connector that can be taken apart.
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Well it could be any one of a few things ! There are two blower motor relays , two fuse's an the blower motor resistor, but wouldn't think that is the problem unless you have high speed blower operation ! But then again don't know if we are even talking about the same fan ? heater fan not cooling fan ?
Im almost sure that your problem is a broken or leaking heater core and needs to be replaced cose 1 your coolant level allways will be low due to the leak and 2 it could damage your blower fan motor. if in winter time you need the heat fixit... If not you could cancel the 2 waters hoses going to the heater core. hope this helps.
Have you tested the front blower motor with a test lead hooked to 12 volts? Use a length of lamp cord and make up a jumper to test the blower, replace as necessary. Also inspect the connector to the blower for signs of melting or burning, replace as necessary.
The 1992 was prior to Buick putting cabin air filters in so there is not a possibility it is clogged. So more than likely your blower motor is going bad or your fan control switch is bad. Does this problem occur with heating as well as AC? Does it change if you switch between blowing on floor, face, window(defrost) If it doesnt change based on location of blow and type of air temp then I would start by turning fan on high and placing head (ear ) against dash in center of console area. Have someone turn fan knob from low to high with engine OFF...After goign from low to high and back a few times you can see if the blower motor is responding to signal from switch. Listen for a whine, squeal, rattle, or humm. A whine or Humm would indicate a bad blower motor... Squeal or rattle a bad squirrel cage/fan blower blades. If you hear no noise and no perceivable change in blower speed/noise then its possible your switch is bad. Unfortunately the only way to definitely diagnose either is to pull the switch from dash and use multimeter to test for voltage change and for blower motor to pull dash. There is a digital control unit for your car as well. Although rare sometimes the wires on this can loosen or it can go bad. But since you didnt state teh fan wasnt working at all and you are getting cool air, that woudl be teh last thing to check
If you are talking about the thermo electric cooling fan, its operation is independent of the car's electical system. It is switched on and off by the engine temperature. When you park, the engine heat soaks upward to heat the thermostat turning the fan on. It will run until the engine cools down and the thermostat switches it off.