My wife's 2012 Murano had a bad air conditioning compressor clutch. I ordered a new clutch and installed it and it kicked in and started blowing cold air yay. But now after she drives for about 20 minutes it stops blowing air out of the vents. I can hear the fan still running but almost nothing comes out. I look under the hood and the pipe is covered in ice and frost all the way to where it enters the firewall. I tried removing the cabin air filter and no luck. If anyone knows what the likely problem is I would love to get this sorted out.