Which is the switch on the receiver / dryer that controls the aux fans on my '91 300E? There are two switches there, one sticking straight up, and one coming out sideways, both seem to have two poles on them.

I'm trying to diagnose why my aux fans don't come on at the low (fan) speed when my A/C is running. The A/C blows cold, especially going down the road, which may be because I 're-oiled' my fan clutch silicon fluid myself, and the clutch doesn't really release all that easy anymore. (The Toyota fluid came in three different viscosities, I chose the higher viscosity.) I don't mind the main fan running more, as I live in a hot climate. Anyway, maybe the A/C condensor is getting adequate cooling due to the main fan without help from the aux fans, but I'd rather have the aux fans working properly.

Note that the aux fans do activate and run at high speed when the engine temperature reaches 105 degrees C. So this leaves me with 1) faulty pressure switch on the receiver / dryer, or 2) the resister that is bolted to the fender behind the driver's headlight is faulty, or 3) bad connection somewhere on that circuit (though I don't see where).

If it is the pressure switch, can I bypass that switch? I don't want to have to evacuate and re-charge the system just to replace the switch, and the A/C is running acceptably right now.

Thanks,

Jeff

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