Davies

Been a while since I last visited. (My trusty ol' 993 has been underused for the past three years.) I took her out last night for a good run, all was perfect, and then I pushed the defrost button, which caused my nice cool air to go away and raging fires of hell levels of heat started blowing through all vents, left and right +windshield. Now it's blowing all hot, all the time, even with temp control set to cold. Like everyone here, I've had periodic footwell servo flap issues, which tends to affect only one side - but this is a new beast. I've searched but not found an exact replication of this issue. Any thoughts/ideas from resident HVAC experts would be appreciated! Many thanks in advance.