Your dealer was referring to the type model of your ac compressor, it's a Calsonic V6. It's a fairly common Asian auto AC compressor model. If I recall correctly, both the 2nd(y33) and 3rd gen(F50) q45 used the Calsonic V6, where as the 1st gen q45 had a Calsonic V5. As far as the sqeaking sound, its hard to say without seeing hearing it for myself. it could be a power steering pump or cooling fan pump going bad. The VK45DE has a unusual hydraulic cooling fan system, which uses power steering fluid. But its separate system than the power steering, which is why you have two reservoirs for power steering fluid. They are next to each other, which confuses people. If the squeak is belt related, it's better if the idler pulley is bad, and not the tensioners. Taking the two belts off is simple, though-just need a 12mm socket wrench, 6mm allen, 14mm socket, breaker bar. DON'T mess with the hex bolts on the tensioners, the allen wrench is ONLY for holding the tensioner open (via the hole).