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I heard that you can take the temperature control wheel out and reheat the solder points around the dial. I have the same problem on an '87 190e. I'm still trying to figure out how to take the console out to get to the temp wheel. You have a vacuum leak. Or possibly a bad heater valve. Open the hood, remove the leaf tray, and locate it on on the passenger side. It has a red vacuum hose sticking in the top of it. Check it for water leaks, and check it for vacuum leaks using a Mityvac or some other vacuum tester. When vacuum is applied, the valve is closed, blocking hot water to the core. If the valve checks out, put the tester on the red vacuum line and see if vacuum is present in the pipe. If not, then you have a problem elsewhere and the valve is fine. Possibly a vacuum leak as indicated above. JC.

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Q: Why is the heater on your 1985 Mercedes Benz 190e always on?
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