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Bi-Level Climate Control Vacuum Switch Replacement
 
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Pelican Technical Article:

Bi-Level Climate Control 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:

Bi-Level climate control vacuum switch

Hot Tip:

Label the vacuum lines with a masking tape

Performance Gain:

Bi-level airflow

Complementary Modification:

Replace vacuum lines

If you notice that you cannot actuate the bi-level control for your climate control, the bi-level vacuum switch may be at fault. In order to get at the bi-level vacuum switch, the glove box must first be removed.

In this article I will first show how to remove the glove box. Don't worry. It's a fairly simple process. Then, I will show you how to methodically locate the bi-level climate control vacuum switch, remove it and replace it with a new switch. This will enable you to repair your climate control system yourself.

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.

Lift the glove box out from the instrument panel.
Figure 2

Lift the glove box out from the instrument panel. Be careful when you do this. The last thing you want to do is to damage the glove box in any way.

Once the glove box is out, you will notice that the vacuum switchover valves are located to the right side of the car behind where the glove box was just seconds before you removed it.
Figure 3

Once the glove box is out, you will notice that the vacuum switchover valves are located to the right side of the car behind where the glove box was just seconds before you removed it. 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. Simply remove the terminal jack 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. Be sure to carefully label each check valve with masking tape and indicate which line feeds which switch. This will assure that you don't attach the incorrect line to the incorrect valve.

After you have properly labeled each switch with its corresponding line, pull off each jack that is connected to each switchover valve.
Figure 6

After you have properly labeled each switch with its corresponding line, pull off each jack that is connected to each switchover valve.

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 of the vehicle.

The bank of switchover valves should now be free, if you are following these directions to a T.
Figure 9

The bank of switchover valves should now be free, if you are following these directions to a T.

The bi-level climate control vacuum switch has a color code next to it and a number.
Figure 10

The bi-level climate control vacuum switch has a color code next to it and a number. The color code is a green circle with a red stripe running down the center and the number 35. 

The bi-level climate control vacuum switch is easily removed using a flathead screwdriver.
Figure 11

The bi-level climate control vacuum switch is easily removed using a flathead screwdriver. Installation is the reverse of removal. Be careful when you put everything back together. Make sure that you don't damage the glove box when you reinstall it in its home in the dashboard.

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