[QUOTE=schwarzwagen]right now, it comes on erratically on the highway, /QUOTE]

Should the fan come on on the highway? There's probably more flow through the radiator at 35 mph than the fan can hope to blow. Plus the VCF has an rpm cut-off somewhere between 2500 and 3000 rpm IIRC.

Is the the existing electric fan doing it's job in low speed and high speed modes?

Sixto
95 S420
87 300SDL