Howdy,

Like the title says, air is not blowing out of the center vents when the AC is on.


Was wondering if anyone had some input.


Thanks in advance.

Could be a bad vacuum pod, switchover valve or vacuum problems

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

Oracle,

Any part numbers on those? I don't think its vacuum as everything else works.

Any more info would be appreciated, thanks.

Most likely is vacuum.

The a/c controller (pushbutton) sends signals to vacuum control valve block & that valve allows vacuum to go to vacuum elements that move the flaps in the heater box.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

you can buy some of the pods and switchover valves online some you cant.
EPC is free btw and you can look the numbers there.

cold air vacuum element part #- A 124 800 03 75

http://catalog.mercedesshop.com/ShopByVehicle.epc?q=&yearid=1995@@1995&makeid=63@@MERCEDES%2DBENZ@@63&modelid=6392%3ABT%7C5%3AMBC%7C1508%3AED%7C10000022@@E320+Sedan&keyword=vacuum@@vacuum&catid=All@@All&subcatid=P%3A241862@@Vacuum+Change+Over+Valve&applicationid=W0133-1607176&mode=PA

Download ACC.pdf from FileFactory.com

Download vacuum.pdf from FileFactory.com

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

There are multiple threads in here on the vacuum pods- gsxr has the best one. Search to find it or him.

"I don't think its vacuum as everything else works." Wrong- the vacuum pods develop hairline cracks over time, so it is very possible for one pod to fail while others still work, as well as all other vacuum related functions.

You can diagnose the vac pods with a mityvac, pulling the passenger side airbag, and checking vac at the distribution manifold on the heater box. Gsxr describes this, as do many other threads.

Much more likely to be vac pod not ACC module. Been there, done that, fixed it thanks to gsxr.

See my post #4 here

http://www.peachparts.com/shopforum/showthread.php?t=242519&highlight=controller

This assumes your system has gone to default. The vac line under heater box to reservoir is often overlooked. If you have to pull passenger air bag to check controller, it's easy to do. Just follow instructions posted elsewhere in forum.