When was the last time you flushed and changed the coolant? Did you use one of those chemical flushes? You didn't use the Prestone "All Makes, All Models, Mixes with any Color Anti-Freeze" did you? If you did, let us know, it would be evidence to confirm what I, (and everyone suing Prestone, and had it upheld by the courts) have been saying all along, their claim is bogus, their derivative of Dexcool dyed a different color is the least likely of all the products out in the market to support such a ridiculous claim.
It really sounds like a leak in the heater core and unfortunately, that means only one thing, pulling out the entire dash to change it. Never done it a Commander, but did it on a 1991 Mini-Van and it was a horrible job, took an entire week end, and that was a 2nd attempt, I gave up earlier and re-attacked much more organized the 2nd time.
Just like working on helicopters, doing this job, bag and tag it. Get a box of sandwich bag and tape, and put the fasteners for each item in a bag and tape it to that item. Then set the items out in exploded fashion in an open area to keep track of it all.
A good manual helps, other than Factory Service, I don't think there is anything for the Commander. Maybe the same generation Grand Cherokee Chiltons. Do a search, several people have posted some ways to access the FSM through online libraries and such.
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Last edited by Mongo; 02-15-2011 at 12:41 PM.