door lock stop work i need help to fix the damn thing

What model car? Does it have the vacuum locking system?
regards,
Mark

92 400 se

Eddie,
I have a 94 E320 with the vacuum locking system, and I assume your SE does also. I could insert the key into the dirver's door lock but could not turn it. The passenger's door lock and the trunk lock worked fine. A new lock from Meercedes was needed. Take proof of ownership to the dealer, he will order a new lock, and your current key will work in the new lock. It cost me about $280, and arrived in one day. Takes about 10 minutes to install.
regards,
Mark

no mine door open fine but only one driver door not all 4
so i duno maybe mine pump its bad

Pump controls all doors, I would check out the actuator in the door or maybe it is a vacuum hose leak. I think it is pressure to lock / vacuum to unlock. This pump also provides vaccum for heater, backup rods, lumbar, and the headrests

heater work good maybe pump