I have an '87 240 (b230f/m47) with 142K miles. At start up in cold weather (has been in the 30's recently) it makes a whistling/whinning sound that increases frequency as the idle is increased. I'm suspecting the water pump just because I haven't replaced it yet (have owned the car over a year, 10K miles) but I don't know what a Volvo water pump sounds like when it's going bad. I know a Ford WP, which is a lot louder than what I have. After it warms up, the noise goes away. I also have a power steering belt squeal, but that is loud and recognizable. The strangest noise my car makes is at highway speed (65-80mph), and can be described as a high frequency metallic vibration. One of the nuts on the exhaust manifold is not completely tight, and the washer is able to move and vibrate. I consider most of the noises normal on a 13 year old car.