The V6 has the Mercedes Transmission, it does NOT come with a dipstick you are suppose to take it to the dealer for servicing. You can purchase a dipstick off ebay for like $25, but you have to check against the temperature of the fluid and a chart for an exact level, that beyonds most owners ability.
The HVAC blend doors are actuated by an electric motor, NOT vacuum or cables like most cars in the past. Its a problem area for the commander, a little plastic lever from that motor breaks and the HVAC blend doors do NOT open correctly and air does NOT flow out of the vents properly. So turn the Blower Motor on full and check the airflow out all the vents as you change modes on the HVAC. If the motor is turning, but airflow seems blocked or misdirected, then it needs to be fixed. Its just needs a $30 plastic part replaced, many folks have done it themselves, but many dealer would likely rake you over the coals on labor for fixing this.
Check the spare tire, its a full size and you need a full size because of the EBCS/ESP that can NOT work with different sized wheels. It on the underside of the rear of the vehicle. They have sagged down and make clunking noises as they rock back and forth, cinching it back up will probably fix it. I bought my Commander used from a dealer, but they got it from a rental company. The spare tire had been stolen out of it, I didn't notice until I got it home. So double check, considering the cost of the wheel/tire and that you can steel the spare in a moment from any parked commander with a set of bolt cutters, I'm sure I'm NOT the only one that has had a spare stolen.
Finally, the KEYS, make sure you get two of them or find out how many have been made total in its life, i.e. how many the P.O. lost. The FOBIK are a major PIA to have copies made, and if buy the key from the dealer, it will easily cost you hundreds of dollars just for a copy of a key. The earlier Xponder key is a pain as well, but I don't think it is as bad as the Fobiks. You can only have 7-8 keys total made the whole life of the vehicle any more will NOT work.
Most used Commanders will only come with one key, the P.O. will almost always loose one and will never go to the trouble and expense to replace it, and only give you one key.
Plan ahead on the keys, you can get a blank key off e-bay for like $30 and then comparison shop the dealerships and maybe find one that will program them as cheap as $50.
I believe 2008 and earlier, if you have 2 working keys, you can program additional yourself using a procedure described in the owners manual. In 2010 they got rid of that feature, and you can only have a copy made by the dealer. NOT sure on the 2009.
What happens if you loose all the keys that your vehicle is suppose to be capable of using? The 7 or 8 that they designed the system to use? I can't believe that a vehicle becomes worthless and unable to drive again because you've lost all the keys that Chrysler limited you too in your design. BUT, I can't find anywhere what the solution would be. I'm guessing if you replaced several ECU's in the vehicle, you could reset it and be able to start over on your key count. BUT, configuring those ECU's would require the proprietary protocols, i.e. only the dealer could do it, and I wouldn't be surprised if the dealer charged you thousands to do this.
Read the Dealer Forum, make sure to do your homework before brining the vehicle in for servicing, better yet, take it too an independent shop for standard servicing. I guess with the bad economy, a lot of dealerships are trying to make up their losses by ripping off customers on servicing. There are several stories of people going in and just asking for standard 30k mile servicing and getting ripped off royally and being charged $1600. Ask on this forum, do your research, your owners manual will tell you exactly what you need to have done and at what mileage.
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