My 2000 BMW 528i AC works fine most if the time but about every 5-6th time I crank it the AC just won't come on. If I just wait for a few minutes it starts to work, then stops then starts again and after a while it will stay on and cool just fine but hard to figure out why it just stops or won't work then it does.

SOURCE: I have a coolant leak on my 2000 BMW 528i and now it overheating.

Pressure test cooling system to determine origin of leak. Radiator and coolant reservoirs are common problems. Vehicle is very difficult to purge air from cooling system and may take multiple times of idling until thermostat opens. Sometimes help to rev engine to about 2500 rpm 5-8 times to help build heat and move coolant through system. Must have heater on while performing this task.

John DeCosta

• 155 Answers
• Posted on Jul 01, 2009

SOURCE: 100000 mile service checks/replacement parts on a 2000 BMW 528i

If your talking about what would a dealership change, it generally consists of a tune up, including spark plugs, plug wires, air filter, oil change, pcv valve, and fuel filter. Thats also usually when they want to replace the timing belts. There may be one or two other things specific to BMW, but generally thats what you can expect.