A guy I met through the board here has a problem with his 90 SDV climate control - blower on high even with the key off and only through the defrost vents. If it was just the defrost vents I would think vacuum leak, possibly through the parking brake, but the blower on with the key out makes me think electrical. I read through as many posts as I could find on this and the prevailing recommendation seemed to be a bad BCM but I never saw a follow up saying that changing the BCM fixed it. The only difference with his symptoms and the threads here is that his CC panel display is still operating normally - in the posts here people were getting the 'd' in the CC and/or FDC display. His still goes between modes, but the fan stays on high even when the CC is set to 'off'. Opinions?