I have a 1988 XJS with the MK3 system.
So now that it’s a frosty 30F morning here in Seattle, I drove today to test out my heater. (I have replaced all heater hoses, and also the heater control valve)
With my engine totally warmed up to 180F, I turn on the heater to max, 85F. I can feel warm air coming out of the lower vents (although I would say it’s only in the 70’s), but there is ice cold air coming out of upper vents. So my feet and legs are warm, but my upper body is cold. I assume this is not the way Jaguar designed it?
Can anybody point me to how to diagnose and fix my issue? I’m assuming there is a series of vacuum operated flaps? And how to get at 'em?