I need to temporarily disable the central locking system in my son's 1984 300D. He is about 300 miles away and it will be about two months before I can go see him and work on the central locking system. The system is operating erratically and he really only needs to lock and unlock the driver's door.

I remember two check valves near the oil filter housing. One was a 1 in/2 out check valve that was gray and yellow. If I remember correctly, this check valve is for the climate control.

There should be another 1 in/1 out check valve for the central locking system in the same vacinity. Does anyone remember what the color is for this check valve, black/white or black/blue?

My thought is to have my son disconnect this check valve on the input side and plug the hose until I can work on the system.

Any other suggestions?

Thanks.

__________________
Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 283K (still have)
82 300SD 298K (still have)
84 300D 264K (son now drives)
84 6.2 Diesel GMC Suburban 225K (a whole different story!)

Block the two big yellow lines going into the firewall.