I took my idle control unit off through my glove compartment because I was experiencing fluctuating idle from750-1500 rpm. The control valve checks out ok so it leaves me with the idle contol unit as the potential problem. When I looked for a replacement unit online I found the VDO brand and other brands that have only a 10 pin connection-mine has 12 pins. In the picture it looks like there is no pin for # 12 AND 10 on the unit. Is this alright to replace my old unit with this 10 pin unit? What does the # 10 and 12 pin do? Please respond asap as I have the unit off and would like to order a new or used one right away. Btw, my control unit is a Bosch Gerblaseregler 12v - there is two sets of #'s 1147 328 026 and 000 822 1103

Thanks, Kerry

The part number that you quote is the blower speed control, not the idle controller. It should be mounted to the left of the blower module and at right angles to it (black plastic box about 1 1/2 x 4 x 4 "). Will have a part number such as 002 545 33 32 or 002 545 01 32.

If you have a small soldering iron and know how to use it (or have a friend that does) these can be easily repaired. The capacitors mounted on the circuit board develop bad connections around the pins. The board is coated with a conformal coating (lacquer) that should be removed first (solder side only). Coat the board with a gel type paint remover using a China bristle brush, leaving on only until the coating krinkles. Wash off with a jet of water and follow immediately with a drying with compressed air.
Use an electronic grade solder to resolder all of the rectangular shaped capacitors.

Thanks Rick I really appreciate it. I feel like a bird brain!!!!! It was dark in there and I'm waiting for a factory manual. Thanks for helping me out. I now have the right part!!!!!