Thanks so much for your reply. I have tried opening the trunk with the key. That is the only way I can do it, unless there is some secret release latch I don't know about. I was reading with interest another Mercedes owner whose trunk was stuck and coincidently, the A/C was blowing out of the defroster vents. He determined that this was a vacuum problem. I noticed my heat and A/C were coming out of different places around the same time my trunk lock started acting up. So, I thought I'd throw ithe problem out on the net for input.