Mercedes Benz repair: 1981 mercedes 380sl, mercedes benz 380, number search results

Question
Greetings,
I just bought a 1981 mercedes benz 380 sl and having issues with the climate control.
Heater:
when I turn the temp wheel to 85 with the ac switch on off and hit auto lo or auto hi, no heat comes out, blower doesen't blow. I can turn on ac switch and turn it off and then cold air starts blowing, but only cold air and it is blowing everywhere except for the three vents in the center. Defrost and bilevel also blow cold air.
A/C:
A/C works and cools fine except no air comes out from the three center vents.

What I've done to troubleshoot:
1. Tapped on the climate control servo in the engine compartment (it stamped manufactured in USA). Checked all vacuum line.
2. Check and replaced the fuse in the passenger compartment.
3. Pulled off the center console and double check all wiring (to my best abilities).
4. Checked the vaccum line on the driver compartment, even unplugged everything and had the green hose go direct to the intake. Still same problem.
5. There is a clicking noise coming from what appears to be a cylinder thingy at the foot of the passenger compartment. Mounted on the firewall.
There is three of those things in a row with what appears to be a vacuum line coming out of it.

Please help.

Answer
Sounds like a bad mono valve diaphragm.
PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1981 Mercedes Benz 380SL
Part: Mono Valve Repair Kit
 Note:  Heater Valve
Electromagnetic heater valve.     
 Chassis: 009934-
R3023-15174 Mono Valve Repair Kit Bosch IN STOCK $55.50  
  
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc...

The outer vents are A/C system only, the single center vent = fresh air only, and one on either side in center dash is heater vent only.

The clicking cylinder unit has me baffled, a picture would help, or you could join the SL Forum where you can post pictures: http://www.mercedesshop.com/shopforum/forumdisplay.php?f=18

You need an owners manual, and service manual to learn proper function, and for service data.

http://www.classictechlit.mbusa.com/MB/default.asp?catalog%5Fname=Retail

Owner's Manual
Part Number                                         Price  
QL-6510-5230-02 380 SL/SLC; 1981 (Reproduction) print  $19.99  

Service Manual
Part Number                                   Price
QL-6516-5604-02 CD-Rom R107 Service Manual Li. $19.99



http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=107045&M=116%2E960%2C962&GA=722%2E30...