I have a '84 300TD wagon. Last year I took the car in to get the A/C checked out as it was not working when I purchased the car. They checked the lines and it seemed to hold pressure just fine. They replaced the valve with one for R134 and put two cans in, and at once the compressor kicked on and started blowing cold air. The aux fan has never worked but that didn't seem to matter much unless I was standing still and it would be a little less cool. Everything has been working fine for the last year, until recently. It stopped blowing cold air and now there is just warm air that blows out, even when speeding down the highway. I took it back in, thinking that it just needed more R134. He hooked it up to his gauge and he said that it had sufficient coolant pressure (around 40 on his gauge, not sure what that means but he said @ 45 is normal). And he said the compressor seems to be engaging fine. The copper tube where the coolant input valve is located is no longer getting cold as it used to. I replaced the no.8 fuse in the fuse box. The system is definitely blowing air through all vents but it is NOT COLD. I know I need to replace the aux fan and am in process, but don't think that is the problem. Any ideas or suggestions for further troubleshooting would be greatly appreciated. I live in Texas so I'd love to get it working again.