I have a 1974 280C with A/C. The blower motor only comes on when the A/C knob is turned on. Makes things kinda cold in the winter.... Any advice?

The heat and AC blowers are separate. The AC blower is engaged when you turn the AC on. Sounds like you have a problem with one or more of the following:

- AC switchover valve may be sticking, not allowing current to the heater blower
- Heater blower fuse is blown
- Blower switch bad
- Heater blower bad (very bad news)

There are a lot of posts on the Vintage Forum on this.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe

Do you know of somewhere online there is a diagram that shows the wiring and relative location of these items. I have a Chilton book but it spans too many years and models to be useful.

Send me an email and I'll send it to you.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe