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Blower Motor Resistor Replacement
 
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Pelican Technical Article:

Blower Motor Resistor Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

***

Tools:

Phillips screwdriver, T15, T25 Torx

Applicable Models:

Volvo V70 (1998-01)
Volvo V70 2.4T (2001)
Volvo V70 AWD (1998-99)
Volvo V70 GLT (1998-00)
Volvo V70 GLT SE (2000)
Volvo V70 R (1998)
Volvo V70 R AWD (1999-00)
Volvo V70 T5 (1998-01)
Volvo V70 X/C (2001)
Volvo V70 X/C AWD (1998-00)
Volvo V70 X/C AWD SE (2000)

Parts Required:

Blower motor resistor

Hot Tip:

Be careful not to damage blower housing

Performance Gain:

Replace faulty blower motor resistor

Complementary Modification:

Replace blower motor and resistor together

Volvo V70 vehicles are equipped with a climate control system with multiple sensors, controls, air temperature units and ducts. The blower motor that controls airflow into the passenger cabin is among the most consequential components in the climate control system. The blower motor resistor (or final stage) varies voltage to the blower motor to achieve the desired speed. The blower motor is a D/C electric motor driven by varying current supplied by the blower motor final stage unit.

If your blower motor fails, replace the blower and resistor together. You don't want to have to go back in if one fails later. Usually, when the blower motor resistor fails, the blower motor will work in only one speed, or fluctuate when a set speed is selected. Most times it defaults to high speed, leaving other speeds not functioning. To confirm the resistor is the root problem on your V70, test it first. See our tech article covering blower motor testing.

Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The blower motor blower motor resistor is located behind the right side of the dashboard and is serviced from the interior of the vehicle.

The blower motor (red arrow) that controls airflow into the passenger cabin is among the most consequential components in the climate control system.
Figure 1

The blower motor (red arrow) that controls airflow into the passenger cabin is among the most consequential components in the climate control system. The blower motor resistor (green arrow) (or final stage) varies voltage to the blower motor to achieve the desired speed. The blower motor is a D/C electric motor driven by varying current supplied by the blower motor final stage unit. Both of these components are located in the heater housing, behind the glove box.

Remove the glove box and lower kick panel.
Figure 2

Remove the glove box and lower kick panel. See our tech article on the glove box replacement. Then, working at the left side of the blower motor resistor, disconnect the electrical connectors. Start with the top one, press the release tab (green arrow) and pull it straight out to remove it.

Then remove the lower electrical connector (red arrow).
Figure 3

Then remove the lower electrical connector (red arrow). Pull it straight out to remove the connector.

Working at the right side of the blower motor resistor, remove the T15 Torx fastener (red arrow).
Figure 4

Working at the right side of the blower motor resistor, remove the T15 Torx fastener (red arrow).

Push the wiring harnesses in front of the blower motor resistor up and hold them out of the way.
Figure 5

Push the wiring harnesses in front of the blower motor resistor up and hold them out of the way. Angle the top of the resistor out. Then lift it up to detach the lower tab that secures it in the housing. Once detached, slide the blower motor resistor (red arrow) out of the heater housing to remove it. Reverse the removal instructions for the blower motor resistor installation. When installing the blower motor resistor into the housing, be sure that the wiring is orientated as it was before. Place the cooling fins into the housing. Then attach the clip at the bottom to the housing. Angle the top toward the heater housing and secure it with the fastener. Confirm the blower function is correct and reinstall the glove box.









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