[Bob's944]

I've heard of this problem from someone else in texas before, but never found a solution. My 85.5 944 is doing the same thing, blowing the heater fuse after about 5-10 minutes after using the a/c. The system blows cold before the fuse blows, it's the heater fuse popping, not the a/c fuse. Going up one size does not help, and the frequency of blowing increases as the system is used. Anyone? the local shop was no help.