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Blower Duct Temperature Sensor
 
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Pelican Technical Article:

Blower Duct Temperature Sensor

Time:

30 minutes30 mins

Tab:

$50

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:

Temperature sensor

Hot Tip:

Some sensors are twist and some are pull

Performance Gain:

Proper engine cool down

Complementary Modification:

Replace air filter

There is a temperature sensor on the air duct that leads from the blower motor to the heat exchangers. Most people think that this sensor has to do with the HVAC system when in fact it does not. The sensor is there to detect the air temperature coming up from the heat exchanges after the motor has been turned off. When the engine is off, heat trapped in the exchangers can build up and as heat rises it can work its way back into the engine compartment. If the sensor determines the heat level is outside of a certain parameter it will turn on the blower motor to evacuate the heat down through the flaps in the exchangers. Usually you will get an error code for this but if you live in a hot climate area, drive your car hard, and park it on hot asphalt and never hear the fan running after you shut the motor off, you may want to check this.

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. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

The cars with the newer style blower assembly have the temperature sensor below the fresh air inlet duct (red arrow).
Figure 1

The cars with the newer style blower assembly have the temperature sensor below the fresh air inlet duct (red arrow).

The older cars do not have this duct and the temperature sensor is upward on the blower to heat exchanger duct (red arrow).
Figure 2

The older cars do not have this duct and the temperature sensor is upward on the blower to heat exchanger duct (red arrow).

Both electrical connections are separated the same way; squeeze the metal tab on the connection (red arrow) and then pulls it straight back and off.
Figure 3

Both electrical connections are separated the same way; squeeze the metal tab on the connection (red arrow) and then pulls it straight back and off. The newer cars (like the one shown) will have a rubber grommet that the sensor sits in; you can just pull the sensor straight out from this.

On the older style cars you will need to turn the sensor 45 degrees until you can pull it from the slot on the duct (red arrow).
Figure 4

On the older style cars you will need to turn the sensor 45 degrees until you can pull it from the slot on the duct (red arrow).

This is an old sensor; new sensors should be compatible for both the twisting type (red arrow) and the rubber grommet type.
Figure 5

This is an old sensor; new sensors should be compatible for both the twisting type (red arrow) and the rubber grommet type. Installation is the reverse of removal.

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