Mercedes-Benz 1976 450 SEL { Need a service manual or help with repairs }

My Mercedes-Benz is in need of repair.
1. Heater blower only works on defrost 2. odometer does not work 3. Needs brakes 4. Shifter is out of alignment and a little of this and a little of that
I can do a lot of the work with the aid of a manual :-)
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there are generic workshop manuals for these cars, as they were extremely common. Any decent car parts store should have them, or be able to order them in....
I'm looking for one my self, but unfortunately for me, I don't think a 6.9 version was ever made.

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Heater blower only works in Defrost.
At the very very bottom of the cursed "servo" is a bi-metallic vacuum switch. It's the "cold engine lockout" to keep the blower OFF until the coolant is warm enough to make heat in the heater. The warm coolant opens the switch allowing vacuum to the climate control system, including turning ON the blower. DEF overrides the cold engine lock out, so the good news is that the blower works, the bad news is the location of this vacuum switch. It has two vacuum lines attached, unfortunately, as I recall they are NOT the same size that you can easily jump the switch.
Years ago the switch cost about $10 at the dealer, probably about $30 today.
Buy a real M-B manual and you'll be all set.
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climate control on the 6.9 was optional in Australia, thank god mine doesn't have it. good old fashioned "manage it yourself" heater and air condition controls.

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I'm working on the front brakes today :-) { Cold } I will be glad when summer gets here
I wrote Mercedes customer assistance center for information on how to get a service manual. They have alternative materials { materials no longer available in a printed manual }. Mercedes offers the WIS { workshop information system } and is compatible with windows NT 4.0. They sell a subscription that will give the most current technical information for models dating back to MY 1985. Older vehicles may require supplementation with, either microfiche,manuals,or body-style specific technical CD-ROMs.
Now heres the catch $ 2,575.00 plus tax and shipping and can be renewed for a fee on a yearly basis @@
Well it's day by day so I will finish the brakes :-)
Thank You very much for responding to my post. I'm most grateful
snipped-for-privacy@adelphia.net
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I have a bunch of MBs, mostly newer, some older, and I'm an engineer but no mechanic. That

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AllDataDIY.com has had everything I've needed to learn how to maintain my MBs the last few years.
It's got diagrams, troubleshooting checklists (including test voltages, vacuum measurements), illustrations, electrical schematics, vacuum schematics, component identification and locations, Technical Service Bulletins for the car, Recall Notices for your exact model, even the estimated repair time for shop labor on certain repairs and maintenance tasks.
It's been just the thing I was needing. Like you, I couldnt' find a Haynes manual that fit my exact model, and didn't want the professional MB service offerings (I'm not a repair shop, just an owner); I would love to have a Star Diagnosis system, but I've heard it's $25,000 for the system, and then an arm and a leg for the updates afterwards. Likewise, the service subscriptions that MB offers are directed to the independent dealer (where it's more cost effective to use) than to the do-it-yourselfer who only wants to have technical info available for the cars he owns.
I recently changed the brakes on my MB sedan. Never having done it before, and being disc brake pads, it took no longer than 40 minutes to do both front wheels with their instructions. Great resource.
http://www.alldatadiy.com

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