Where is the blower motor resistor located on a 1988 dodge lancer

should be just above the blower motor. You will need to remove the glove box door to gain access.

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Should be on the firewall just above the heater box.

It's right next to the blower, above the passenger's feet. See pic below.

1. Disconnect and isolate the negative battery cable.
   
2. Reach under the instrument panel near the blower motor and disconnect the wire harness connector from the blower motor resistor.
3. Remove the two screws that secure the blower motor resistor to the HVAC housing.
4. Remove the blower motor resistor from the HVAC housing.
   

The Lancer blower motor's are known to heat up and burn out. If you remove it, it is labeled with "Do Not Repair", but it is possible. If you look inside of the block, you will see a flap sticking up - that needs to be soldered down in order to work in the 1 - 3 positions.
The Blower resistor is located on the passenger side under the dash, in the air plenum left of the blower motor.
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In the Dodge Dakota the blower motor resistor is located under the hood, on the right side firewall.

Dodge Dakota Blower Motor Resistor Location:



Dodge Dakota with a complaint of no blower operation. After unplugging the harness connector and removing the two screws, you could remove and examine the resistor coils for damage. The heat and subsequent rust damage are clearly visible in the picture below.

It is under the dash on the passenger side close to the blower fan. Follow the wires, there should be a connector visible for the resistor on the housing. The resistor is usually held in place by a couple screws.
Check the pic. #10 is the resistor pack.

The blower motor resistor is located on the evaporator case next to the blower motor....comes out with a couple small bolts

Number 2 is your blower motor resister.
Number 3 is a blend door (damper motor)
Number 4 Hose
Number 5 Blower Motor
Number 6 Blower Case
Open glove box you will see it on you left hand side
It will be a very tight fit, Sure take about 30 to 40 minture.
Let me know if this help you..

The blower motor resistor is located on the dash panel, on passenger compartment, right behind the glovebox. The resistor is mounted on a plate assembly that can be removed as shown on picture below:

I've never seen a vehicle w/o a blower resistor. You don't need to remove the blower. The resistor is about 2 inches x 3 inches and is installed in a hole in the plenum (duct) near the blower motor. It will have a wiring harness connected to it. It could be under the passenger dash or under the hood, depending on where the blower motor is.