Hi,
How important are the numbers below.
Can I focus on just one set of numbers. I can find a match for 4R8318C612FG, but not WOQA00180
Part No. 4R8318C612FG
Serial No. WOQA00180
TIA
Jim

 

Jim,

The serial number is specific to that particular module in front of you. Something is wrong if you find another module with that serial number.

Before replacing the module, have you worked through the troubleshooting guide?:

https://www.jaguarforums.com/forum/s...ol-how-185002/

2003+ cars have a known issue where a bad DCCV can overload and damage the control module. If you only replace the control module, the new one can be damaged by the old DCCV. More details in the guide above, post #2.

If unable to find a replacement module, consider having your existing module repaired:

https://jaguarclimatecontrol.com/

He also includes an upgrade to add fuse protection to prevent future damage.

 

Many Thanks for the reply. I did note somewhere on the web that the DCCV valve has to be replaced prior to replacing the control module.
So, if I find a replacement with Part No. 4R8318C612FG, that will work on my car after I replace DCCV? There are so many different part numbers, some with just one letter different. I will show the link https://www.jaguarforums.com/forum/s...ol-how-185002/ to my Tech guy.

Thanks again

Jim

 

Can't say for sure what would happen with a part number that is close but not a perfect match. Our cars have multiple control modules for different systems. In many cases, the part number varies with the software installed. The differences could be minor and go unnoticed, such as minor improvements made over the years. Or the difference could be big enough that a mismatched replacement module won't work at all.

There's no factory info for us, as the dealer protocol for a bad module was to replace it with new and install the appropriate software. They'd never install a used module from another car, so Jaguar never provided any detail about what would and wouldn't work. It's a real can of worms with no clear answer, other than an exact match is usually good.

As far as replacing both the module and DCCV, I forgot to ask what symptoms were you experiencing? Was it the common max heat at all times? After checking some prerequisites, this fault usually points to a bad DCCV. And on 2003+ models, a bad DCCV often damages the control module. Just wanted to make sure I was sending you down the correct path.

 

Thanks for the reply. Car blows hot air when on auto, however when on dual LH blows cold and RH blows hot.

 

Not quite sure I follow what you're saying. Automatic is the normal operating mode. The light should be illuminated at the AUTO button. Even if the left and right sides are set to different temperatures, that's still automatic mode. If you manually adjust the fan speed or doors, that knocks it out of full automatic, but the temperature is still automatically controlled to whatever number(s) is displayed on the control panel.

Manual mode is when you drive the selected temperature up until HI is displayed, or down until LO is displayed. Manual mode bypasses some (but not all) automatic features and is very helpful for troubleshooting.

Reading between the lines, you may have a second problem with the automatic control. The troubleshooting guide is laid out in order to first verify the DCCV is operating properly, and then you move on to any remaining symptoms. Even though you're having a shop do the work, you can still do some of the troubleshooting yourself ahead of time. Most of the diagnostics are pretty simple, such as push a button, go for a test drive, and watch the thermometer.

 

Many Thanks Carl. I will do as advised.
In answer to your question, it is in auto mode that temperature is hot, in manualMode LH side blows cold, however RH side blows hot even with both set to LO

All the Best

Jim