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Where the Car is the Star
XJS MODEL HISTORY
I had similar problem. Turned out that the flaps inside console that move to direct air to the screen had stuck closed on the foam seals whilst not in use for along time. The mechanism is, as ever, very complicated and driven by the servo motor behind the right hand heater control switch. This is a very powerful motor/low gearing with the result that being unable to open the flaps, it stripped the bond between the gear wheel and shaft that carries the cams that move the flap levers. Took the switch out (difficult but can be done from the side panel on the tunnel, only one nut holding it, but lots of sticky foam pads). I then drilled the gearwheel and shaft with a fine drill in a pillar drill and inserted a pin to fix the gearwheel to the shaft again. Meanwhile use brute force to free off the flaps and spray WD40 up the box to stop it happening again. 10 hours to diagnose and 1 hour to fix!
Ta! Glad to hear I am not the only one with trouble. I have now found the Brown one way vacuum valve that draws the water flow control on the heater shut was not working. Now, to a fashion, I have cold air. Can you tell me, I can hear the clutch on the air-con unit clicking in as it works. However it seams to work initially in short bursts and gradually these bursts get longer. Is this normal? Of course typically, its getting colder so less need of cold air it would be nice to have it right though.
Anyway, thank you for your input. Its good to hear of these repairs. Everyone I speak to normally take a large input of breath through their teeth and say 'well, it could be one of many things'. Soo much help. It normally comes from someone who doesn't own an XJS.