Bought a new blower resistor bur the wiring is different but has the same part number. Old one has two sets of wires from it. new one has got a lume of wires and two thwt must go to the fan.
Can you please assist me.
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Okay, first off it is not a motor, it is a small board with 4 different length coils of wire placed on it. It is called a resistor pack, and it is in the circuit between the blower speed switch on the dash and the blower motor. Car makers usually place them attached over a small hole in the heater/AC case under the dash, so that the small coils get some air blowing across them. They get hot when used because the small coils create resistance to current passing through the wire.
If your 1 and 2 speed coils are burnt out, a new resistor pack will make all settings work again. Look for a multi-wire connector up under the dash on the heater/AC case. If it is retained by two screws, that is the resistor pack.
Remove blower motor resistor and check to see if it discolored or melted. if so then replace blower motor resistor, also blower motor speeds 1-4 go through resistor, 5 goes direct from switch to blower motor. check wire harness connector at resistor, it should have six wires five power wires that corralate with the five settings on switch, so in each switch setting one wire should have power. the sixth wire is the ground. also harness connector to resistor it may be melted, if so go to dealer with vin number and get new harness connector with resistor. I hope this helped.
It sounds like the blower resistor needs to be replaced and the blower motor it self. Auto Zone will have the blower and resistor that you need to replace and will have the step by step instructions for you to get the job done with common tools and will take about 2 hours if your good with tools. Good luck and keep me posted. Setting 5 should have 12 volts running to the blower motor so check the wire harness for voltage readings at the blower motor harness clip, you may only just need a new blower motor.
the resistor you bought is for manual heating, your three wire is more a module then a resistor. you need the module for the automatic heating system, automatic heating has a digital display and manual has sliders.
It could be the switch or the blower resistor has gone bad. You can check the wire leads to the blower resistor for any power problems which would indicate a speed switch issue. If all the speed setting has good power at the wire leads to the resistor, then it's gone to be a bad blower resistor and you can pick on up at Auto Zone and there will have the step by step instructions to getting the job done with common tools. Good luck and keep me posted, be glad to help you get your trailblazer running 100%
The blower motor works on high setting ONLY when the blower resistor is
bad. The blower motor resistor is held in place with 2 screws and
attached into the heater housing under the right side of the dashboard.
You can identify the resistor by the big wires that are connected to
the connector. If this heating/cooling system is the auto temp type,
the part is a bit high on the price.