Ok, so I purchased an 04 LS Ultimate from a relative a little while back, it had been in a front/left collision and was repaired for the most part. There are a few different problems that I need to troubleshoot. First off, the a/C and heater aren't working correctly. I was told that my wife's cousin which was the previous owner had her mechanic check it out because it was only blowing hot air all of the sudden. She was told that it was the Dual Climate Control Valve. She didn't want to replace it because the part was costly at the time, so the mechanic some how bypassed it for temporary and she said it fixed the problem for now. Well, when I first drove it, the air was blowing ice cold, but once I got up to higher speeds, it would turn to heat. Im not sure how he bypassed it, Im guessing its like bypassing a heater core? Anyhow, I was gonna go ahead and by a new DCCV tomorrow, but this is what makes me think twice about it. Often, I get a knock that comes from behind the dash in the steering wheel area, its like something is moving too far and hitting the under side of the dash. I'm thinking maybe a blend door actuator moving too far? If there is a blend door under there? And if so, could that be the problem and not the DCCV? Im wondering, if its supposedly bypassed, should it still blow hot and cold air? Another problem is that the drivers side front wheel isn't centered in the wheel well, it sits more toward the firewall and has a big gap from the bumper. Im guessing they didn't fix that part, maybe a bent lower control arm? The car does drive straight, Im guessing instead of fixing it, they just aligned it. The ride of the car is pretty rough but not really bad, Im hoping a full alignment will fix it, since I do notice some tires wearing more then others. The car doesn't have air suspension does it?