A repetitive clicking noise from behind the center area of the dash panel is usually caused by a broken stepper motor actuating arm. The actuating arm controls the direction of air flow in the climate control system. Disassembly of the center console will be required to access and change the broken arm with the updated, reinforced part.
Resources for the Repair and Maintenance of your 2003 Mercedes-Benz C320 4MATIC
2003 Mercedes-Benz C320 4MATIC
2003 Mercedes-Benz C320 4MATIC Problems
Inside grab handles, the upholstery on the center console cover, and door trim panels can delaminate. Most commonly replacement of the affected part is necessary.
Catalytic converter failure is common and may cause a Check Engine Light to illuminate.
The crankshaft position sensor may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool off, but it may run roughly or have poor performance. Communicating these specific symptoms to your technician can save diagnostic time.
The electrical connector at the automatic transmission may leak fluid into the wiring harness. If not repaired, the oil will migrate through the wiring harness and damage the transmission control module. A new harness and control module may be necessary to correct this problem.
2003 Mercedes-Benz C320 4MATIC Questions and Answers
what type of mobile oil do i use?
gas cap not closing c320
2003 Mercedes-Benz C320 4MATIC Reviews
I like this car a lot and like to learn things I can do to maintain my own vehicle. I have had my 03 c320 4matic wagon for 4 years now. I bought it with 80k on it and it now has 120k. The radiator has a defect that leaks coolant into the transmission cooler and causes the transmission to buck because of the water and glycol in the tranny fluid. Recommended fix is to get an after market radiator, not the brand originally in the car (Voleo) and flush the system. No problem. Bought online for about $100. Full synthetic Mobile 1 transmission fluid is at Autozone and approved for Mercedes so you don't have to pay for Mercedes brand fluid. I replaced the belt tensioner and belt on the side of the road at a cost of $130. Tensioner bought at Pep Boys and belt bought online as I anticipated needing it from the squealing sound. I also replaced both front control arms and sway bar links as well as the rear links. I love this car but you have to understand that every car has it's issues. I will be getting front strut bearings because of the creaking sound when I turn the wheel. There is a clicking sound from behind the dash that is an actuator arm for the climate control that is plastic and needs replaced. the whole dash has to be removed to replace it and in my case it controls my side of the defrost so the windshield on my side stays foggy for quite a while. The splash guards inside the front fenders have also been replaced as they came lose and got torn up by the tires. Silly problem you wouldn't expect from a high end German car. The SRS light came on and I read that it could be a seat belt or a connector under the seat. I also changed to ceramic EBC brand Red Stuff brake pads which work great and don't leave my front wheels black with break dust. The HID bulbs (H2) can be found online in sets of 2 for $50 - $100for the set. Don't spend a fortune on Mercedes branded bulbs. In the end I still love this car but thank God I'm handy. All of this would have cost a fortune at a garage. I won't buy another Mercedes with more than 50k on it so I can enjoy it more before so much stuff needs replaced. Read forums and learn about your car. That's how you find out the most economical way to fix a problem. I use mbpartswarehouse.com (drivewire) and rockauto.com a lot. Also a great salvage yard in AZ called tristar.com. Got my contol arms there. I hope this review helps someone.
Feels like I got a lemon car. I bought the car when it had 46 thousand miles on it. When I hit 60 thousand everything started to go wrong at once. The rear sun visor motor burned out, the air flow sensor went bad (caused my car to not be drivable), both front axle inside boots sheared off, both control joints went bad (causing the car to wander extremely to each side while turning to the point were it was unpredictable and scary), the entire interior started to seep the glue through everything and now its sticky everywhere, the door lock solenoid went bad and jumps the lock up and down, you cant control the AC direction or temp because the vents stops diverting correctly, the motor mounts are going bad, AND TO TOP IT OFF the front differential or transfer case went bad and sends a clunking jolt vibration through the whole car that sounds like I hit something. Not just under hard turning... light turning, reverse, coasting in a straight line and the car wants to jump past my brakes while stopped at a light.
Never buy a Mercedes 4 wheel drive anything... I've herd the same problems from a lot of 4matic owners of every model.
So far, so good. Except for a rather flimsy, hard plastic door handle for the front doors, everything else is first class. Comfortable, yet sporty ride, durable construction, reliable engine.