A "frozen motor"? Or a frozen compressor? I think you have two compressors and the one for the rear air could be locked up. I would check the pully(s). Take the belt off that compressor, everything should turn freely including the compressor. Check Europarts of San Diego for that rear A/C compressor. You will see that the dealer is a little high on theirs. Buy the parts and have them install if they will.
thanks for answering------I called today and they said the pulley was frozen and he was sure it needed replaced. They are a Dodge/Chrysler dealer......he expected $2,000 plus...and I couldn't buy parts....because they warrant for 12/12000 miles........my sprinter has 23,000 mile.....and I'm now thinking
thinking of adding a warranty ......they have one for $3,000...24 months.....and good at any Dodge
Chrysler dealer(that) works on Sprinters .......very few work on them in my home state even though only a few miles away....can you suggest another warranty ? I have disability and down time in another state can be rough
thanks