Everyone,

I was lacking heat in my new-to-me '02 3.0 with 105K miles, replaced the DCCV and thermostat and now I have heat! I don't know how long the heat hadn't been working but two new things have popped up-

If I have the dual climate zones at different temperatures the passenger side seems much hotter than the driver's, would that be indicative of passenger side temp sensor(s) issues or something in the climate control head itself?

Also, after I've been driving a bit the radiator fan runs after the car has been turned off which is normal but it was about 65 degrees this morning; the fans didn't run before the DCCV, t-stat and coolant change...

Any and all thoughts/suggestions are appreciated!

 

There are temp sensors that might need to be cleaned out. One is to the left of the steering wheel on the dash, not sure where the passenger one is.

 

Have you burped all of the air out of your coolant system since changing the DCCV?

 

Access the passenger temp sensor by dropping glove box and look to upper left. Check the forum search feature for the particulars of this.

 

Could also be your air cond. module. There's a circuit trace on these that tends to short out when the DCCV goes bad. There should be several write ups in the archives on how to pull the circuit board and see if that's the case... this is exactly what happened to mine after replacing my DCCV (as far as the lop-sided heat thing goes).

 

Bob,

Thought about the possibility of the CCM as well but I have a 2002 model, isnt the burned tracer common only on 2003 and later models?

 

Its neither, the heater core need to be flushed out and hope you can get enough flow through the drivers side of the core to clear it. The heater core end run is on the drivers side and debris and sediment collects there and hardens. You should have blown out the core with compressed air in each pipe while you had the dccv out. I would go back and do that first. Then flush it. On cores i could not clear this way i had to replace. I cut the old ones open and youre not gonna get any flush though a core thats plugged up solid down on the end which is the drivers side. Another reason to do cooling system flushes as well ws operate the heater at least a few times in the summer.

 

Oh, I'm not sure which years the burnt trace issue wasn't applicable (perhaps your year has a completely different module design than the later years). Just thought I'd toss it out there as mine was doing the exact same thing and it only takes maybe 10 minutes to pull the board and check it.

 

Thay can burn traces on all yrs, but most often on 03 and newer

 

Update- When dual zone isn't turned on I get two different temperatures from the driver's and passenger's side, when dual climate is on at 70 degrees for the driver and 84 for the passenger the driver's side is hotter than the passenger's side...

It was 45 degrees driving in this morning and the radiator fan turned on, to me I think the inside temp sensors need to be looked at a coolant bleed; anyone else have any ideas or suggestions?

 

Brutal seemed quite emphatic on the heater core flush, so that would probably be a good place to start.

It's also a relatively easy place to start.

 

If your ac module(the display) was ever replaced and not programmed it works to uk right hand drive standards ie all function are backwards for the us. This is why i always have to argue with extended warranty companies that tell me the ac modules dont have to be programmmed and dont want to pay for it...ok then im not programming it and the customer can call you when they notice the controls operate backwards..................

 

Good call Sir! What about the possibility of having the hoses that run from the DCCV to the heater core swapped, that would make the temps opposite as well, correct?

 

Huh? Why did Jaguar do that? I would have thought a common center stack and control method makes more sense.

 

Why not fix it correctly if thats indeed the issue.
Why would they do that? Well because the car is built in the uk, thyere a right hand drive and "we" drive on the wrong side of the road. So theyre just setup for uk market and if it goes to the us you just program it as such. The car are all built to be either right or left. If you look on the passenger side firewall youll see the blocked off opening for the steering column to come through to convert to right hand drive

 

Flaps and stuff? I didn't think about that. Now it makes sense.

 

The DCCV went bad in my '03 and I delayed replacing it which resulted in the Climate Control Modul failure. $1,523 dollars later all is well. By the way if any, Royce, Mercedes or Jag owner in the St. Louis area needs service I highly recomend Erwin F.chwarz dealership. On time, reasonable labor hours charged and you get you car back detailed out. Don R

 

Don remember the modules can be repaired and you can DIY if desired. You can also send it out to this place. They can even add some kind of circuit board protection to prevent it from happening again. When the DCCV goes bad it sometimes draws excessive current and this is what does the damage.

DIY: Diagnose It Yourself - JaguarClimateControl.com


It's pretty easy to see the damage. We have had a great repair thread with pictures on this site. It burns a trace on the circuirt board and only a short peice of wire is needed for the repair.
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