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Blower Motor Resistor Replacement
 
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Pelican Technical Article:

Blower Motor Resistor Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$160 to $200

Talent:

*

Tools:

13mm wrench, Philips head screwdriver

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

New blower motor resistor

Hot Tip:

Use care removing the blower cover

Performance Gain:

All kinds of heat and A/C

Complementary Modification:

Change cabin air filter

While a true sports car, unlike some of the older vehicles from Porsche, the 944 is fully capable of keeping you warm in the winter and cool in the summer. Over time some of the components in the HVAC system will start to wear out and require repair or replacement. This is especially true if you live in a harsh four season environment and run the system more than a vehicle that lives in a more temperate location.

The blower motor works in conjunction with the resistor pack to move air through the HVAC system. If your blower motor will not run at top speed, the most likely culprit is a bad resistor pack. The resistor works in conjunction with the motor and system to control the speed and therefore volume of air moving through the system. Failure of the motor to run at top speed, while running smoothly and quietly at lower speeds is almost always due to a faulty resistor pack.

Changing out the resistor is a simple job, which is nice because it is not a cheap part to replace. This article will take you through how to do it step by step.

When working with the electronics on the vehicle I always like to disconnect the ground cable with a 13mm wrench and place it in an area where it cannot accidentally make contact with the negative battery post while I am working (red arrow).
Figure 1

When working with the electronics on the vehicle I always like to disconnect the ground cable with a 13mm wrench and place it in an area where it cannot accidentally make contact with the negative battery post while I am working (red arrow).

The blower motor and resistor are located under the cowl cover piece at the base of the windshield (red arrow).
Figure 2

The blower motor and resistor are located under the cowl cover piece at the base of the windshield (red arrow).

Begin by pulling up and removing the rubber seal that runs along the divider between the engine bay and HVAC system (red arrow).
Figure 3

Begin by pulling up and removing the rubber seal that runs along the divider between the engine bay and HVAC system (red arrow).

You will need to remove the plastic cover (red arrow).
Figure 4

You will need to remove the plastic cover (red arrow). There is a very good chance this will not come off in one piece; these get very old and brittle over the years. If you have not removed it lately, there is a good chance you will damage it and need to replace it when removing.

With the cover off you can see the blower motor assembly and the resistor (red arrow).
Figure 5

With the cover off you can see the blower motor assembly and the resistor (red arrow).

Gently wiggle and pull the connection up from the base (red arrow).
Figure 6

Gently wiggle and pull the connection up from the base (red arrow). Then use a Philips head screwdriver and remove the two screws (yellow arrows) holding the resistor to the housing.

Next, pull the resistor up and out of the housing (red arrow).
Figure 7

Next, pull the resistor up and out of the housing (red arrow).

There are two contact points on the switches on the resistor (red arrows); you can try cleaning these before replacing the resistor itself.
Figure 8

There are two contact points on the switches on the resistor (red arrows); you can try cleaning these before replacing the resistor itself. If this does not solve the problem, installation of a new resistor is the reverse of removal.

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