Hello All,

I have a beautiful 1978 450SEL that I need some help with. I'm a wiz at domestics but intimidated by imports. Let me break it down. When we first bought it A/C didn't work and now it doesn't blow hot air. However, now it seems that when I turn on the heat (i.e. turn the climate control to its hightest setting) the temp continues to drop. I've considered the temp control, thermostat or heater control valve but before I acted I wanted to get others opinion.

Thanks,

Joe

Joe,

There should be 2 fans. one for AC, the other for heater. Is one running and the other not?

I know on my 72, there is a auxiliary fuse box located on the firewall, right in front of the passenger. one is for the heater, the other for AC.

Hope that helps.

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72 250 M130 W114

Thanks. I'll give it a go.