Re: great new 156 jtd,no air con/vdc failure
air con prob: can you hear the compressor kick in and out when you turn it on?
A sensor could be down on the system, you need to take it to an A/C company that can look at and diagnose the entire sytem.
VDC, could be a sign that the battery is on its way out. I have the same problem, I also have 2 spare batteries, just too lazy yo change it!
Thats if it comes on just after starting then goes out a few mins later. usually OK if you start it and keep the revs above 1,000rpm, alternator provides enough voltage then