Mercedes Benz car doors will not open?

Question

I have a 1986 Mercedes Benz 190e 2.3-16. When I open the car doors with the key, the only door that will open is the drivers door. The rest of the door i have to go inside and pull the lock up to open the doors. What is the problem and the name of the part that needs to be fixed? What is the price range of this part and how much in total will it cost to get fixed?

PS

-I have to pull up each door lock from the inside to unlock that particular door. And i see the locks on each of the other doors move a little bit but it doesnt come up.

-The lock failures did not all occur at once.

-I'm pretty sure that the locks are based on a vaccum.

-And please dont tell me to get a new car!

-The heater and ac does not work

Answer 1

It is simple vacuum leak around the doors channels.

Try to find those connections and press the air with bike pump or similar or find the leak