Just bought this car:
2007 S-Type, 4.2 with Nav System.
Defroster was blowing air fine. Today (windshield was frosted) I cannot get air to blow on the windshield. All switches are functioning (lighting up) just nothing blowing on the windshield. Were should I start?
Thanks,
Brett

 

Could be DCCV as it;s the commonest failure.

 

If it's not blowing is the fan running? Do you get air out of any other vent?

I thought my defrosters were not working but I had no heat because of a heater core/AUX coolant pump problem.
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All other functions and vents seem to be working fine. Heated up fine. Fan sounds like it is working good just nothing going on the windshield

 

Reading on - JaguarClimateControl.com my problem doesn't seem to be a "symptom" of the DCCV. All other vents were functioning. Just seems like the defrost vents weren't opening up

 

You are right. It's not a DCCV problem. Any chance it's something simple like the defrosters are blocked somehow?

I think you need a dealer to cycle all the doors in the system to see if they respond correctly. I don't think you can do this with a standard scanner like the ELM327. Sounds like a dealer will be required.

It's a rare problem so please post back when you find the problem.
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I have that same problem with my jag the defrost don't blow air on the windshield a mechanic advise to check the fuses #75#80and #99 under the driver side dash to desconnect the battery for 20 min to make a electrical reset,
but this was't the solution. for me

 

Sounds like the stepper motors aren't functioning so no air directed to windscreen vents.