2003 DCCV Saga continues...
 

Here's where we stand now...

1) DCCV replaced. Vents still blow hot on the sides and lukewarm/lukecool in the center.

2) Suspecting fried climate control module (non-navi)... Dealer wants $1500 for the parts and another few hundred to replace. Rather not go that route, but I can't find a used on eBay.

3) Considering trying (emphasis on "trying") to fix it myself based on the pics and threads here. But I'd rather a pro do it, so I call three local shops before I find one that will even take the car in. They keep it for two weeks and remove the control unit, but do nothing else. They finally call me today and tell me to come get the car, that they aren't comfortable trying to solder anything on the board.

4) In the meantime, I ask them to check the three climate sensors in the dash. They tell me "they looked good." lol...OK, I don't know what that means. I strongly suspect they did not actually check them.

5) New development: I'm now driving around with no CCM in the car. But once you get going down the road, air will force itself through the dash vents. Well, that air is now boiling hot, meaning the DCCV is open and letting hot water into the heater core inside the car. I take it this is normal?

Jess

Hey jess, I have the same issue i.e. vents blowing cold driver side, center:warm, passenger: hot. New DCCV; but likely a toasted CCM (non nav.). One day I'll drag the module out and fiddle with it. Go ahead jess and solder it yourself or bring it to a TV/Stereo repair shop and sign off on them being liable. I bet they can do it correctly.

If it's the CCM it tends to fail in these ways:
1.burnt out PCB trace (you can find it by close inspection and solder a new wire across it)
or
2. failed driver transistor(s)

The failures occur because of a failed DCCV so don't fix the CCM without fixing the DCCV or it'll blow the CCM again!

Someone on the .co.uk forum posted about #2. Search on
ZVNA4306A
which is apparently a suitable replacement transistor.

There are plenty of posts here about where the temp sensors are, how to clean them, etc.

Thanks for mentioning the transistors. I'd never heard of that being a problem before. I was aware of the PCB trace problem.

We've put in a new DCCV already, so hopefully we won't fry the CCM a second time.

Jess

jagv8, thanks for the CCM vital fix info.

You're welcome.... actually it's the guy on www.jaguarforum.co.uk we all have to thank!

If anyone needs their CCM Fixed, either the ground trace resoldered, or a transistor replaced I'd be glad to help out, although I don't know about the logistics of it.

Take Care,

George.

This might help http://www.gusglikas.com/images/Auto...ype%202000.pdf It has a link to a climate control troubleshooting that might help.