I have seen replies for earlier model Jags. I have a 1995 Vanden Plas, XJ6....Heat and air is now only blowing through defrost vent. Could I get an idea of what to troubleshoot on this? Mechanics in my area are not very good with Jaguar, and seem to be only able to relieve me of the amount of money I have in my wallet. I dare not take to the Jaguar dealership. Any help would be appreciated.