Location of heater blower resistor

Usually they are located behind the glove box.

Does the heater fanwork ? Or is the heater not getting hot?

Attached to the blower motor is a device called the Resistor Pack...
It has a 4 wire connector...Wire colors are...Yellow...Green...White/Blue...And Blue.
Inside this resistor pack is a fuse. If you use an ohm meter.
One probe on Yellow wire and other on the Blue.
If it reads "open" the resistor pack is defective.If you read resistance
the pack is Good. Main power to the circuit is supplied via fuse #25 (25A) located in the under-hood fuse box. So simple answer is .The blower motor resistor is located close to the blower.
Let me know.

The blower motor resistor may be the cause of it not working. They cost roughly $12. Here is a video on how to replace them:

Vw passat b6 2006 -2015 heater blower fan resistor replacement ...

I would try to isolate the blower motor power connection, disconnecting anything from the motor and jumpering 12V DC directly into it to see if it will run when power is applied. That would rule out a bad motor. These are good places to start.

If you have a manual system, you have a resistor. If electronic, you have a blower motor speed controller. Please rate if this helps.

here is info:

Control System Outputs-Manual A/C
Blower Motor Switch Resistor
The heater blower motor switch resistor has the following features:

• The assembly is located on the evaporator housing in the engine compartment.
• Three resistance elements are mounted on the resistor board to provide four blower motor speeds.
• Depending on the heater blower motor switch position, series resistance is added or bypassed in the blower motor circuit to decrease or increase blower motor speed.
• An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F) interrupting the blower motor operation in all speeds except HI.
• The thermal limiter cannot be reset and is not serviceable.

Control System Outputs-EATC
Blower Motor Speed Control
The blower speed control is located on the evaporator housing in the engine compartment.

• The function of the blower motor speed control is to convert low power signals from the electronic automatic temperature control module to a high current, variable ground feed for the blower motor (18527).
• The blower motor speed is infinitely variable and is controlled by the electronic automatic temperature control module software.
• A delay function provides a gradual increase or decrease in blower motor speed under all conditions.

you need to replace the blower motor resistor module. usually only has 2 screws and a plug and is located above the passenger floorboard.

First-check fuses.If O.K. remove blower motor.But before that check for power on a motor terminals.Sometimes the resistor make the same problems.Located into blower motor housing

Try unplugging the blower resistor, located under the passenger side, under dash area, put a new fuse in and see if the fuse opens (blows). If it does not blow then unplug the blower located in roughly the same are and plug the resistor back in if it blows then it the resistor if not it's most likely the blower motor.
If the fuse blows when both resistor and the motor is unplugged the you need to unplug the a/c head unit and see if it still blows(open fuse)
Hope this helps

The blower motor is located behind the glovebox.

You will need to remove the glovebox and you will see the blower motor at the top right side. Remove the screws holding it, disconnect the electrical connector and remove it from the car. It is a tight squeeze, be patient.

Try to locate blower motor wires, usually up under dash on passenger side, maybe behind glove box, and follow wires from motor and they will usually connect to housing area, and real good chance that connection is your resistor pack if held on by screws or small bolts. Other place that you may find resistor is opposite side of firewall from blower, under hood. Look for connection at firewall, usually on passenger side.