1978 450SEL Heater Controls
My 1978 450SEL has a working A/C but a wavering temperature control
and the up and down vent controls seem to work somewhat ineffectually and the opposite to what is intended. When I set the lever for the upper setting it blows better at the feet and Vice- versa. The right hand temperature control lever also seems to Jam unless the nut at the bottom is loosened off suggesting a sticking vent flap deep in the bowels. If the heat controls are set to off the water valve shuts as intended and allows the A/C to work but the heat is either on or off. The system has improved dramatically since I replaced the relay in the drivers kick panel which energises the system and at least I get either hot or cold and not both when it feels like it. I would appreciate any single or collective experience before I blindly pull the dash apart and re-invent the wheel. The system has the two rotating dials one above the other in the console - top works the fanspeed and the bottom works the A/C with a heater slide either side with a vent control inside and in parallel. |
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