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HVAC Air Temperature Sensor Replacement
 
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Pelican Technical Article:

HVAC Air Temperature Sensor Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$0

Talent:

*

Tools:

Your hands

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

New air sensor

Hot Tip:

Check for availability

Performance Gain:

proper working HVAC

Complementary Modification:

Change out your air vents

The HVAC or blower motor air temperature sensor determines the temperature of the air as it flows into the blower motor assembly. It is easy to change and can be done without any tools in just 30 minutes.

If the sensor fails to work you can attempt to clean it with some MAF sensor cleaner. This sensor is no longer available (NLA) as of the writing of this article so be sure to check for prices and availability when ordering.

The HVAC air temperature sensor is located under the cowl cover piece at the base of the windshield (red arrow) on the right side.
Figure 1

The HVAC air temperature sensor is located under the cowl cover piece at the base of the windshield (red arrow) on the right side.

Begin by pulling up and removing the rubber seal that runs along the divider between the engine bay and HVAC system (red arrow).
Figure 2

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

You do not need to remove the entire plastic cover (red arrow), just the right side.
Figure 3

You do not need to remove the entire plastic cover (red arrow), just the right side. There is a very good chance this will get damaged while working with it; 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, so use care.

The sensor is mounted on the right side of the blower housing (red arrow) in front of the screen and above the vacuum flap actuator.
Figure 4

The sensor is mounted on the right side of the blower housing (red arrow) in front of the screen and above the vacuum flap actuator. Remove the sensor from the mounting clip and push it back and out.

Release the wire clips and pull the senor out from the connection.
Figure 5

Release the wire clips and pull the senor out from the connection. Then you can attempt to clean the sensor area (yellow arrow) with some MAF cleaner. Do not touch the sensor with your hands or anything else. Simply spray the MAF cleaner on it and let it dry.

With the sensor out of the harness you can attempt to clean it or replace it.
Figure 6

With the sensor out of the harness you can attempt to clean it or replace it. Installation is the reverse of removal.

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Comments and Suggestions:
Freddywright Comments: What are the symptomes of a failed blower motor air temperature sensor?
August 18, 2017
  Followup from the Pelican Staff: Improper cabin temp from what was setting. - Nick at Pelican Parts  

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Page last updated: Mon 9/25/2017 02:52:31 AM