What to check in vacuum leaks - PeachParts Mercedes-Benz Forum

toydiesel · #1 07-20-2011, 03:06 PM

I have vacuum leak when:

The AC is running
Driver door lock is in unlock position

What are the prime suspects? Info on what to look for first would be appreciated.

tyl604 · #2 07-20-2011, 10:08 PM

Search the forum for vacuum problems; there are about a zillion posts. You will find a wealth of info.

toydiesel · #3 07-21-2011, 03:25 PM

Thanks for the suggestion. I have searched and read before I started this thread. I am not looking for how to info, just want see if the experts here know which components are more likely to cause these problems.

whunter · #4 07-21-2011, 03:52 PM

Quote:

Originally Posted by toydiesel

I have vacuum leak when:

The AC is running
Driver door lock is in unlock position

What are the prime suspects? Info on what to look for first would be appreciated.

My first guess would be the central locking Actuator element, and/or one of the element diaphragms is damaged.

You need to test the parts with a hand vacuum pump.
Brake Bleeder and Vacuum Pump Kit
http://www.harborfreight.com/brake-bleeder-and-vacuum-pump-kit-92474.html

Vacuum Element, Door Lock Actuator (Master Element) Left Front Fits: 300D-T from chassis # 036517 123.133
MB# 000 800 10 73

Vacuum Element, Door Lock Actuator Right Front/Rear (3 Per Car)
MB# 000 800 69 75

Vacuum Element, Door Lock Actuator (Master Element) Left Front, Fits: all 300D-T thru chassis # 036516
NOTE: May Also Need: 116 805 01 14 Vacuum Element Bracket 116 805 02 32 Connector Linkage
MB# 116 800 04 73

Fuel Door Actuator
MB# 123 800 25 75

Vacuum Element For Trunk Lock
MB# 123 800 08 75

*************************************************

Climate control parts...

Vacuum Element For Central Air Nozzle
MB# 116 800 11 75

Vacuum Element Main Air Flap at Evaporator Housing
MB# 123 800 11 75

Vacuum Element For Leg Room Flap
MB# 123 800 31 75

Vacuum Element For Defroster Nozzle Flap
MB# 123 800 32 75

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