fan for ac condenser

My 80's M-B cars have an electric fan just for the AC condenser and they are quite thin. It comes on from a temp switch on the filter/drier (>83 F). Even with that, I get marginal cooling at idle, but we do get 115 F days w/ an evil sun here.

I think many people re-purpose M-B fans since my 64 Valiant had just that on the radiator (w/ no engine-driven fan) when I bought it.