I have a 1987 Sabb 900 turbo convertible with 147,000 miles, auto trans, 16 valve. A buzzing (bee like, very faint) noise is coming from under the hood, right front under the back of the headlight. I only hear it when the car is off. There is a red connecting wire that leads to a cannister looking thing. If I disconnect the wire the buzzing stops. The car will start when the wire is disconnected.
What is that cannister thingy? What's causing the buzzing?
Any answers appreciated : )