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Replacing the Vacuum Element Defroster Changeover Flap
 
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Pelican Technical Article:

Replacing the Vacuum Element Defroster Changeover Flap

Time:

30 minutes30 mins

Tab:

$25 to $50

Talent:

*

Tools:

Flathead screwdriver, 8mm wrench

Applicable Models:

Mercedes-Benz R107 (1973-80)

Parts Required:

Vacuum element ? defroster changeover flap

Hot Tip:

Use 20? extension on socket

Performance Gain:

Windshield defrost or defogged

Complementary Modification:

Upgrade amplifier

Cabin air can be heated or cooled but fresh air intake is vital. If the blower appears to work but there is no airflow it could mean that the fresh air flap cannot open. If this is the case it is possible that the vacuum element that operates the flap has failed and needs replacing.

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.

Once the glove box is out, you will see the vacuum element for the defrost changeover flap located to the right side of the cavity.
Figure 3

Once the glove box is out, you will see the vacuum element for the defrost changeover flap located to the right side of the cavity.

Using a Phillips head screwdriver, loosen and remove the two screws holding the bracket that holds the vacuum element.
Figure 4

Using a Phillips head screwdriver, loosen and remove the two screws holding the bracket that holds the vacuum element.

Using a 8mm wrench, loosen and remove the two bolts that hold the bracket to the chassis.
Figure 5

Using a 8mm wrench, loosen and remove the two bolts that hold the bracket to the chassis. You can also use a 20" extension, 8mm socket and rachet to access the bolts more easily.

The flap is actuated by a small rod which is attached to the vacuum valve.
Figure 6

The flap is actuated by a small rod which is attached to the vacuum valve. The rod is easily removed from the flap by pulling it in a lateral fashion. First remove the actuating rod for the vacuum element for the fresh air flap.

There is a rod which connects the vacuum element for the defrost changeover flap that has to be freed.
Figure 7

There is a rod which connects the vacuum element for the defrost changeover flap that has to be freed.

There is a vacuum tube on the vacuum element for the fresh air flap as well as a tube for the vacuum element for the defrost changeover valve that has to be loosened.
Figure 8

There is a vacuum tube on the vacuum element for the fresh air flap as well as a tube for the vacuum element for the defrost changeover valve that has to be loosened.

The vacuum element is now free to be replaced.
Figure 9

The vacuum element is now free to be replaced.

Using a Phillips head screwdriver, remove the vacuum element.
Figure 10

Using a Phillips head screwdriver, remove the vacuum element. Installation is the reversal of removal.


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