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Refrigerant Compressor Vacuum Switch Replacement
 
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Pelican Technical Article:

Refrigerant Compressor Vacuum Switch Replacement

Mike Holloway

Time:

2 hours2 hrs

Tab:

$25 to $120

Talent:

**

Tools:

Flathead screwdriver, 8mm socket, 20-inch extension, wire-cutters

Applicable Models:

Mercedes-Benz R107 (1972-89)

Parts Required:

Vacuum switchover for refrigerant compressor

Hot Tip:

Label the vacuum lines with masking tape

Performance Gain:

Proper cabin air

Complementary Modification:

Change vacuum lines

If your air conditioner is not functioning properly and you checked to make sure there was Freon in the system, it is possible that the vacuum switch for the refrigerant compressor needs to be replaced.

In order to get at the switchover valves, the glove box must be removed. Please do not be dismayed at the prospect of having to remove the glove box. The process is easy and quite straightforward. In this project, I will demonstrate in words and photos how to remove the glove box and how to properly and promptly replace the defective vacuum switchover valve for the refrigerant compressor.

Before you do any work on your car it is important that you wear safety glasses, work gloves and dispose of all fluids in a safe manner. Coolant is poisonous and should be treated as such. Animals and small children have been known to die from ingesting coolant. If you have to jack up your car, make sure to use jack stands and chock your wheels as well as applying the parking brake. Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability. Always wear eye and hand protection. Disconnect the battery before working on your car.

Using a flathead screwdriver, pry off the plastic fastener that holds the glove box in place.
Figure 1

Using a flathead screwdriver, pry off the plastic fastener that holds the glove box in place. Be careful not to break the inset or the fastener. There will be two fasteners to remove.

Carefully remove the glove box from the right side of the dashboard.
Figure 2

Carefully remove the glove box from the right side of the dashboard.

Once the glove box is out, you will see the vacuum switchover valves located to the right side of the dashboard where the glove box was just moments before.
Figure 3

Once the glove box is out, you will see the vacuum switchover valves located to the right side of the dashboard where the glove box was just moments before. The switchover valves are color coded with their representative lines. You can start by pulling out the electrical jack located at the front.

Next notice the terminal jack which sends signals for all the valves.
Figure 4

Next notice the terminal jack which sends signals for all the valves. This can be removed by slipping the metal clasp downwards and pulling the jack straight out.

The vacuum lines can now be removed.
Figure 5

The vacuum lines can now be removed. The yellow check valves are an easy starting point. Labeling each with masking tape and indicating which line feeds which switch is very important.

Pull off each jack that is connected to each switchover valve after the lines and valves have been carefully marked.
Figure 6

Pull off each jack that is connected to each switchover valve after the lines and valves have been carefully marked.

Using an 8mm socket and a 20-inch extension, loosen and remove the three bolts holding the switchover valve plate.
Figure 7

Using an 8mm socket and a 20-inch extension, loosen and remove the three bolts holding the switchover valve plate.

Using wire-cutters, locate the lines connecting the switchover valves and clip the cable tie.
Figure 8

Using wire-cutters, locate the lines connecting the switchover valves and clip the cable tie. The cable bundle will be located towards the driver side.

The vacuum switch plate is now free.
Figure 9

The vacuum switch plate is now free.

The vacuum switch for the refrigerant compressor has a color code next to it and a number.
Figure 10

The vacuum switch for the refrigerant compressor has a color code next to it and a number. The color code is a yellow circle with a black stripe running down the center and the number 16. 

The vacuum switch for the refrigerant compressor is removed using a flathead screwdriver.
Figure 11

The vacuum switch for the refrigerant compressor is removed using a flathead screwdriver. Installation is the reverse of removal.

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