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1992 bonneville sse w/ac replaced blower motor + control module and blower still runs on high will not shut off can't locate where resistor is, fuses + relays are good
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Blower motor control module would be a good guess , but is still just a guess . Testing the electrical circuit would need to be done to know for sure . Do you know how to test electronic's , automotive electrical circuits ?
HVAC Blower Controls Circuit Description
The blower motor is controlled by the blower control module. The blower control module receives the requested blower speed from the heater and A/C control in the form of a 5 volt pulse modulated reference signal. When low speed is requested by the heater and A/C control, the pulse width is reduced. When high blower speed is requested, the pulse width is increased. An open circuit, short to ground or short to battery on the blower speed input circuit of the blower control module will disrupt the pulse modulated reference signal. If the blower control module does not receive the pulse modulated signal, the blower motor will not operate. The blower control module receives power from the rear fuse block. The blower control module also provides a ground for the blower motor. A separate blower motor flange ground is used to limit radio frequency interference.
On any other vehicle it sounds like the blower fan switch. The fan switch provides power or ground to the resistor and there would be a high speed blower relay to bypass the resistor. But in your case the fan switch is part of the controller. I don't have a diagram for a 92 but the 94 model shows relays for low medium and high speeds. Each relay gets power from a fuseable link. The high relay gets power thru the low relay if the low relay is not engaged. If you have the model with 3 relays you may need to check them.
you need new blower module located at blower under hood, against the firewall under the relays it has four or five wires in it, and two bolts holding it in.
Look around on the blower motor box, for some wires going to a connector that is held inside the blower box with a couple of screws. It's the blower motor resistor.
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