Air con half working

[gordj65]

I have a 2007 2.7 diesel s type. I can get the full range of air con temps on the passenger side but only hot on the driver side. Any advice would be appreciated.  

[mrmike]

You need to check if the DCCV is working It is the valve that is pulse modulated  by the clima computer. Obviously one side is remaining open passing hot coolant. If I remember correctly there are 2 possible faults, (Actually more) Faulty DCCV, Faulty control unit, these are the usual culprits. There is an excellent    A/C fault finding guide. Do a search for it, It is on the US site. If you check my posts from a couple of years ago you will find the Url.

Good luck, yours is usually a relatively simple problem to resolve. Mine was complicated it was the compressor and the manual is wrong.

[gordj65]

Thank you, that is very helpful. When I put mine on the diagnostic it tells me there are corroded circuits or something like that, Haven't checked it for a while . But I will look at what you say and see where it goes from there. 

[mrmike]

Check Clauses guide. your problem is the

1 The DCCV valve, ( supposedly terribly unreliable, I bought a new one  immediately, but it was not the problem)

2 The Control Computer 

3 The wiring to the DCCV.

On LHD cars the connections go through the LHS end of the Dashboard, Cover is removable with door open.  From the car Cct diagram you can see the relevant contacts. You can control both sides of the DCCV from here. Using a tester (preferably analogue) and / or a small 12V Bulb and a ptece of wire and croc clips etc. It is a PWM system  If you do not understand please go through the procedure I mentioned in a previous post from the american Jaguar forum. It is excellent...... The whole system is complicated but your problem is most probably quite simple.

Good luck.

M