The "low" button on my A/C blower does not work.

High works, auto works, and goes from hard blowing to low blowin.

Low is essentially off.

Could this be a contact problem?

What is confusing is that the Auto button adjusts infinitely.... if that only blew high, I might be on to a resistor problem.

this is on the 260e....

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1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

The speed control on my 87, 260E (assuming same in your car) is performed by the CCU by sending a control voltage to the blower motor regulator. You can test this control voltage on a 3 pin black connector mounted behind the brake booster. Out of the three pins, 1 pin is ground (pin closest to the windshield wiper motor), another pin is battery voltage (middle pin) and the third pin is the control voltage (pin closest to the driver side fender). When you put the high speed switch on (and one of the ac modes, e.g. bi-level), you should get about 6-10V on the control pin. At low speed, there should be about 1V. If you dont get the 1V at low speed, the problem is in the CCU. If you get 1V and the fan does not turn, the problem is either the blower motor regulator or the blower motor itself.

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Saumil S. Patel