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Legroom Flap Switchover Valve Replacement
 
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Pelican Technical Article:

Legroom Flap Switchover Valve 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:

Leg Space air flap vacuum switchover valve

Hot Tip:

Label the vacuum lines with masking tape

Performance Gain:

Improved airflow in cabin where your feet meet the carpet

Complementary Modification:

Replace vacuum lines

The legroom flap is controlled by the leg space flap vacuum switchover valve. If you notice that the leg space air flap is not functioning properly, it could mean that the corresponding switchover valve that controls the leg space air flap needs replacing. My question to you is, would you like your feet and legs to be as comfortable as the rest of you while you're enjoying the drive in your 450SL? I think the answer to that question is an emphatic yes. This project is easy, so fix the leg space air flap vacuum switchover valve.

The vacuum switch-over valves on earlier models control several functions, including the locking system as well as the climate control, not to mention the various air flaps in your M-B 450SL. If you notice that your idle speed is coming down by a few hundred rpms during warm-up yet it's baseline is up to 1,650 rpms instead of around 800 rpms, this may indicate that one or some of the vacuum-switchover valves may need to be replaced. Please note, the vacuum switchover valves are active when air conditioning is on and this will tend to increase your rpms.

In order to get at the leg space air flap switchover valve, the glove box must be removed. In this project, I will not only explain and show you how to easily replace your leg space air flap. I will also show you how to remove your glove box without damaging it.

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, which holds the glove box in place.
Figure 1

Using a flathead screwdriver, pry off the plastic fastener, which 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.

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

Once the glove box is out, you will see the vacuum switchover valves located to the right side of the dash where the glove box was scant 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 on this job once the glove box is out of the way. Labeling each check valve with masking tape and indicating which line feeds which switch is very important. Be logical and thorough with marking the lines and their corresponding check valves.

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

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

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. Remember that the left and right side of the car is determined by sitting in the cockpit of your 450SL.

The bank of switchover valves is now free as you can see.
Figure 9

The bank of switchover valves is now free as you can see.

The leg space air flap switchover valve is located on the end closest to the climate control amplifier.
Figure 10

The leg space air flap switchover valve is located on the end closest to the climate control amplifier. You will notice color code circles and numbers next to it on the switchover valves. The color code for the leg space air flap switchover valve is a solid blue circle, another circle with a yellow bar running down the center of the blue circle and one with a white bar down the center of a blue circle. You should also see the number 26 there as well. The leg space air flap switchover valve is removed using a Philips head screwdriver. Installation is the reverse of removal.

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