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Heater Blower Motor Resistor Replacement
 
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Pelican Technical Article:

Heater Blower Motor Resistor Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$70

Talent:

***

Tools:

Hands

Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Parts Required:

Resistor

Hot Tip:

The electrical connectors are usually very tight

Performance Gain:

Working heat control

Complementary Modification:

Change your cabin filters

If your heater blower motor is only running on the number 2 setting, is pulsing or not running at all the engine compartment heater blower motor resistor may be going bad. If this is the case, it is quick and easy to repair and can be done in a few minutes with just using your hands.

While the heater tube and motor are a little different depending on whether you have a Varioram or non-Varioram engine, the resistors are located in the same spot and replaced the same way.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. 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.

The resistor is located in the down tube from the blower motor that goes to the heat exchangers (red arrow).
Figure 1

The resistor is located in the down tube from the blower motor that goes to the heat exchangers (red arrow).

Grab the resistor with your hand and wiggle and pull it out of the tube.
Figure 2

Grab the resistor with your hand and wiggle and pull it out of the tube. Once you get it out you can remove the wiring connections by pulling the spade connectors off. Be warned these can really be on tight so do not pull them by the wires or you will damage them.

With the resistor off you can see the two contact points (red arrow); you can try cleaning these points before purchasing a new resistor.
Figure 3

With the resistor off you can see the two contact points (red arrow); you can try cleaning these points before purchasing a new resistor. Installation is the reverse of removal.

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Page last updated: Tue 4/25/2017 03:12:35 AM