Yesterday I installed a new DCCV in my 04. The process was fairly simple and straighfowards. That being said I may have never found the problem if it were'nt for the guys on this site. Nice to have artic air flowing.

 

Way to go Larry! Let Jaguar know what u went through for your efforts to correct their poor engineering. Otherwise, enjoy your cat and we're most happy to help those who keep these now discontinued Jags going. Turn the favor around....

 

Thanks for the acknowledgement to the great members on this site Larry...........It is appreciated.

A big +1 on Bfsgross's comments too about paying info forward

 

Thanks guys. I guess the biggest part of any job like this is take your time and put everything back just as you found it.

 

I have to take a step back and say I did end up having to repair the rccm (remote climate control module). After taking the unit apart it's easy to see what happens when the dccv fails. The copper traces on the pc board are so thin it doesn't take much current draw to toast those foills. I replaced the burn't foil with 24 gauge shielded wire and tested all the output transistors.

I am happy to report that the unit works fine and there is cold air aplenty.

Thanks again to the forum for all the tips leading to this fix.

 

In particular make sure the hose attached to the bottom of the coolant overflow tank is properly engaged and locked. It is possible for it to be in place, look engaged and actually hold water but not be fully seated. It then can eventually come loose and you can pump out all your coolant in seconds. With no coolant in the system, your coolant temperature sensor would not be immersed and never show an overheating indication. If you then miss or ignore the low coolant message your engine is toast in about 5 minutes of highway driving!

 

Thanks for the tip, I did check that upon re-assembly. One thing about that car is they didn't let any space in the engine compartment go to waste.