Cap,

The ECU is a "little black box" that mounts on the firewall behind the glove box on my SL. It has two plugs which go into it, one with 12 wires and the other with 4. It controls--so far as I know--the heating and A/C for the vehicle. May control more than that as well (witness my RPM surge when stopped).

My guess is you have one and I hope you never have to replace it. FYI, when I first started looking into the problem the MB dealership here showed a price of about $254.00 for the unit. When I went back to order it, the price had jumped dramatically. That's when I started looking in other places. My guess is their bench stock on the unit(s) is getting seriously low. Same thing happened to the 000 822 0403. It's now over $1,100 at the dealership.

Going to drive a Mercedes you're going to pay the price, or so it seems!

__________________
Don
'85 500SL (Euro) - 186,000 w/a complete restoration and engine rebuild at 154,000
'95 C280 - 174,000