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Old 02-10-2008, 11:47 AM
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Join Date: Feb 2008
Posts: 4
1980D complete servo removal then bypass? bypass?

I'm new to this site and just bought a 1980 300D with 212K on it. I have been trying to figure out how to fix my heater problems (the only activity I get out of the unit is defrost) and I can see that this is a fairly common problem. Review of the many threads discussing similar problem leads me to conclude that there sure is a lot of complications and high dollar parts in this car in order to get heat and defrost, which seems like a pretty simple concept.

Upon further reading of a very good, detailed post on how to bypass the servo, I am left wondering why just bypass it, why not completely remove the servo and the quagmire of potentially leaking vacuum lines along with it and simply have a conventional cable operated heater control valve on the firewall. Has anybody tried this? It looks like somehow, a person could leave the vaccum system in place in the dash for opening and closing ducts, then regulate hot water into the heater core with the manual heater control valve and direct the air it with the push button controls which still utilize vacuum.

Any ideas would be appreciated.
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