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HVAC Controls Replacement
 
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Pelican Technical Article:

HVAC Controls Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$750

Talent:

**

Tools:

Philips head screwdriver, trim removal tool

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

HVAC control unit

Hot Tip:

Be careful not to crack the faceplate

Performance Gain:

Working HVAC system

Complementary Modification:

Clean your air filters

Replacing the HVAC control unit on the Porsche 944 or 951 is quick and simple, which is a good thing because it is not cheap. There are really only two things that you need to really be concerned about when attempting this job; one- the face plate is really way too easy to break, and two- the wiring connections on the rear can be stubborn to remove if they have never been off before.

Begin by disconnecting the ground cable from the post on the battery.
Figure 1

Begin by disconnecting the ground cable from the post on the battery. This is also a good time to check the condition of the terminal and wiring, as our cable is starting to get a little corrosion (red arrow).

Be very careful when prying the faceplate off of the unit.
Figure 2

Be very careful when prying the faceplate off of the unit. It is just held in by clips on the sides but they tend to break way too easily. Our project car's plate was already broken (red arrow) when we got the car.

Remove the knobs and sliders by pulling them straight off; you can probably do this with your hands for all of them but the fan speed control.
Figure 3

Remove the knobs and sliders by pulling them straight off; you can probably do this with your hands for all of them but the fan speed control. There is a small light behind the knob so you want to make sure you take this knob straight off. I recommend you use a trim removal tool and gently pry it away from the faceplate (red arrow).

With the knob off you can see the small fragile bulb in the center (red arrow).
Figure 4

With the knob off you can see the small fragile bulb in the center (red arrow).

Use your trim removal tool and gently pry both ends of the plate off and then work your way around until the complete plate is off.
Figure 5

Use your trim removal tool and gently pry both ends of the plate off and then work your way around until the complete plate is off. Take your time and go slow, as it will shock you how easy it is to break this plate.

With the plate off use a Philips head screwdriver and remove the four screws holding the unit in place (red arrows).
Figure 6

With the plate off use a Philips head screwdriver and remove the four screws holding the unit in place (red arrows).

Wiggle and slide the unit out from the dash.
Figure 7

Wiggle and slide the unit out from the dash. There are three electrical connections on the rear; two of them just pull straight off (red arrows) and the far left one has a small plastic clip that must be released to allow it to be removed (yellow arrow).

With the unit off you can see the small clip that you need to release for the left connection (red arrow).
Figure 8

With the unit off you can see the small clip that you need to release for the left connection (red arrow). Installation is the reverse of removal.


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