Date registered: Jan 2007
Vehicle: 1962 W111 220SE Coupe
Location: Cloud City, OR
Mentioned: 1 Post(s)
Quoted: 8 Post(s)
It sounds like it could be isolated to the blower, because if it isn't working then you wouldn't feel heat coming out at all. To be sure, the blower doesn't work at all correct, even when set for cool temperatures? If this is the case, the blower isn't too difficult to remove and bench test, just below the passenger footwell (on US cars, no idea where you are located). Before I would do that I would actually go ahead and replace all possible associated fuses because a fuse can sometimes look fine but not function.
Also, how do your under hood wires look? Any cracks or splits to the insulation, or evidence of bare wires especially at the connectors? Check the insulation, you're right at the cusp of biodegradeable wiring harnesses that can cause all sorts of gremlins to start showing up as the coating cracks and allows shorting between wires. This may explain why your trunk and locks are going batty too. You will need to replace the wiring harness for the entire car if this is the case. Someone here makes them way cheaper than the dealer, but that's your choice.
The Coupe Group (W111/112 coupes and cabs)official website
The Coupe Group on Facebook
"Too many people are working at jobs they hate, to buy things they don't particularly want, to impress people they don't even care about." --Dr. Deepak Chopra