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Pelican Technical Article:

Vacuum Distribution Fitting

Time:

1 hour1 hr

Tab:

$15

Talent:

**

Tools:

Flex-shaft, 7mm socket, 10mm wrench

Applicable Models:

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

Parts Required:

Vacuum distribution fitting

Hot Tip:

Use care removing vacuum lines

Performance Gain:

Working actuators

Complementary Modification:

Replace air filter

Like all air cooled Porsche motors the 993 use of vacuum is very important and specific to the vehicle. There is a vacuum distribution fitting at the left rear of the motor that helps to distribute vacuum to several actuators including the Varioram system. This fitting loses its structural integrity over time and fails. It can be very difficult to diagnose as there is no sensor on it. If you are chasing down problems with a funky intake system, it may be as simple as this small distribution fitting. It is quick and easy to check and replace so before you go and start spending money on actuators and other things, give this fitting a quick check

The blower motor assembly is in the way so you will need to remove it. Removal is quick and easy so rather than trying to working around it, simply remove it.

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 blower motor assembly is located on the left side of the engine (red arrow).
Figure 1

The blower motor assembly is located on the left side of the engine (red arrow). There are several components and ducts that make up the assembly and this article will show you how to remove each.

You will be working in two areas on the assembly; the left side for a hose clamp, electrical connection and 10mm bolt (red arrow) and the rear area (yellow arrow).
Figure 2

You will be working in two areas on the assembly; the left side for a hose clamp, electrical connection and 10mm bolt (red arrow) and the rear area (yellow arrow).

Begin by reaching down on the left side and pulling the blower motor electrical connection off and then separate it by squeezing in the tabs (red arrow) and pulling it apart.
Figure 3

Begin by reaching down on the left side and pulling the blower motor electrical connection off and then separate it by squeezing in the tabs (red arrow) and pulling it apart.

Move to the rear and squeeze the wire on the electrical connection for the temperature sensor (red arrow) and separate them.
Figure 4

Move to the rear and squeeze the wire on the electrical connection for the temperature sensor (red arrow) and separate them. You do not need to remove the temperature sensor

Preform the same procedure for the electrical connection on the vacuum actuator (red arrow).
Figure 5

Preform the same procedure for the electrical connection on the vacuum actuator (red arrow).

Carefully pull the vacuum line of the bottom of the actuator (red arrow).
Figure 6

Carefully pull the vacuum line of the bottom of the actuator (red arrow).

Use a 10mm socket or wrench and remove the two bolts holding the actuator bracket to the air duct (red arrows).
Figure 7

Use a 10mm socket or wrench and remove the two bolts holding the actuator bracket to the air duct (red arrows).

Figure 8

You can now remove the duct from the engine

Use a flathead screwdriver and loosen the clamp holding the air duct to the blower motor (red arrow), then lift the duct up and off.
Figure 9

Use a flathead screwdriver and loosen the clamp holding the air duct to the blower motor (red arrow), then lift the duct up and off. The section that connects down to the heat exchangers is a rubber piece that fits over the lip below it by friction and will just pop off (yellow arrow).

Use a 10mm socket and remove the two bolts that hold the blower motor and intake duct to the manifold (red arrows).
Figure 10

Use a 10mm socket and remove the two bolts that hold the blower motor and intake duct to the manifold (red arrows).

You can now pull forward and then lift the rest of the assembly from the engine compartment.
Figure 11

You can now pull forward and then lift the rest of the assembly from the engine compartment.

There is a spud on the rear of the blower motor (red arrow) that will fit in a bracket in the engine compartment.
Figure 12

There is a spud on the rear of the blower motor (red arrow) that will fit in a bracket in the engine compartment.

Just below the grommet where the spud on the blower motor sits (yellow arrow) is the vacuum distribution fitting (red arrow).
Figure 13

Just below the grommet where the spud on the blower motor sits (yellow arrow) is the vacuum distribution fitting (red arrow).

Remove the vacuum lines from the fitting and pull the fitting off of the mount (red arrow).
Figure 14

Remove the vacuum lines from the fitting and pull the fitting off of the mount (red arrow).

Beside the rubber being torn, which rarely happens, the only way to check the fitting is to squeeze it together (red arrows).
Figure 15

Beside the rubber being torn, which rarely happens, the only way to check the fitting is to squeeze it together (red arrows). If you can easily squeeze it together it has lost its structural integrity and needs to be replaced. Installation is the reverse of removal.

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