Date registered: Dec 2006
Vehicle: w115 1975 240d
Location: Lafayette, Indiana
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There are two fans for our W115's. If you have air conditioning there is a squirrel cage blower in the center consol. The heater fan is way up inside and you can't get to it to save your life. The whole dash has to come out.
My heater fan doesn't work at all and after a week of frustration troubleshooting the wiring, switches and trying to gain access to the fan itself, this is what I did:
My air conditioning didn't work anyway so I cut the copper tubing at the evaporator coil, connected heater hose to it and ran the heater hose through the same holes in the firewall where the A/C lines were. I routed the heater hoses through one of the control valves that are next to the brake resevoir, and then to the return at the water pump. I also removed the A/C compressor and all the brackets and associated parts which gives me better access to the altenator belt tension bolt and other things.
Then I disconnected the damper controls and placed cardboard underneath the heater core so the A/C fan won't blow hot air out through the outside vents.
I have more heat than I know what to do with.