Why is my Mercedes vacuum door not working?
The metering valve is designed to restrict the vacuum going to this area. Replace the dashpot and the connector if necessary. Next we turn out attention to the big culprits to vacuum leaks. The door lock check valve. If this is leaking then the doors may work slowly or not at all.
How many cylinders does a Mercedes 240D have?
This is a general over view of a 1981 Mercedes-Benz 240D with A/C. Always check your owners manual before you determine how your particular model is to be set up. The 300 series with five cylinders and the turbo models have a different vacuum line configuration so do not assume they are all the same.
Where is the leak on a Mercedes vacuum?
Another area of great leakage is the metering valves on the main supply line. There is a 3 way and 4 way connector on the valve. Be very careful removing the 2 connectors from the supply line metering valve. The nipples are small and very fragile and prone to cracking.
What’s the black line on a Mercedes vacuum?
The black line supplies the vacuum reservoir tank. Please note that you need to check the green line with the yellow stripe. This line is the most common line to have multiple leaks due to all the dash pod units controlling the HVAC system. If it leaks, just plug it off for now.
The metering valve is designed to restrict the vacuum going to this area. Replace the dashpot and the connector if necessary. Next we turn out attention to the big culprits to vacuum leaks. The door lock check valve. If this is leaking then the doors may work slowly or not at all.
How do you remove a vacuum switch from a door?
Remove the metal bracket the screws were holding and set it aside. Pull the switch gently towards you until you can then slip off the linkage that connects the switch to the lock mechanism. Reach up inside the shell of the door and gently pull the switch down towards the opening in the door. Do not force the vacuum lines to bend excessively.
This is a general over view of a 1981 Mercedes-Benz 240D with A/C. Always check your owners manual before you determine how your particular model is to be set up. The 300 series with five cylinders and the turbo models have a different vacuum line configuration so do not assume they are all the same.