Hi, I have a 99 Astro Van with a nut on the AC line that is frozen/seized. I had to cut off the accumulator in order to access it, and have tried penetrating fluid and also heated it with map gas. Does anyone know how to get this loose? Seems to be a common problem on these vans, we have a couple and I can see where others have tried to change the accumulators and twisted the evaporator line in the bargain. Thanks in advance