I have a 2007 Super V8. The rear AC fan doesn't run - displays all work, but the fan doesn't change speeds. Display shows the fan speed changing, however. I had this happen on my previous '04 XJR, and I replaced the Blower Control Module, and it all worked fine afterwards. So I'm suspecting this to be the culprit for my SV8.

Anybody know the part number for the rear blower control module? Or should I look at something else (I've checked the fuse - it's good).

 

The control module would be the prime suspect. I think the system will store a Diagnostic Troube Code (DTC) if the blower control module fails - if you have SDD you can check the codes.

If you'll download and install the Jaguar Electronic Parts Catalog (EPC) you can look up part numbers, then comparison shop your favorite parts supplier. Follow the instructions in this thread:

https://www.jaguarforums.com/forum/x...uctions-48194/


For Jaguar-only parts, jaguarmerriamparts.com (Merriam, KS) and gaudinjaguarparts.com (Las Vegas, NV) offer discounts that vary from a little to quite a bit. For some reason, Gaudin's new website design makes it difficult or impossible to search by part number but Merriam still allows part number searches.

For example, if you discover that Jaguar part number C2C12905 is what you need:

2007 Jaguar SUPER V8 Parts - Jaguar Parts Center - Call (800) 510-1401 for Genuine Jaguar Parts and Accessories


I don't know about the rear blower control modules, but the front ones can be rebuilt with a new transistor and thermal cut-out. Also, Jaguar revised the front modules with longer heat sink fins to better protect the power transistor. I modified a salvaged heat sink to achieve the same goal on our module. See the details in this post:

https://www.jaguarforums.com/forum/x...2/#post1058751


Cheers,

Don

 

The rear blower control module for the 4-zone AC is p/n C2C12905, somewhere around $280 online, maybe cheaper.

Don't ask me where it is though, the parts catalogue is kind of vague, only shows the location of the front one (in the AC assembly under the dash / near the front blower)

Apparently the module looks like this



So if you can find it, you can possibly repair it. Could be a fairly simple thing like resitor, diode, same like the front module repairs?

 

As Don said the repair is usually a new mosfet transistor and or thermal fuse.

The front blower controller is in the duct to help keep it cool and I would assume that the rear one is similarly in a duct.

Does the front blower controller work?

If not, is it possible that there is only one for front and rear?

Just a thought.

 

I found a diagram of the rear blower module in the Workshop Manual, but it doesn't have a part number listed there. Look for "Auxiliary Blower Motor Resistor" in the workshop manual PDF.

Thanks Cambio, for the part number. Will now go hunt for that part.

Don - I'm handy, but not really handy with a soldering gun, etc. Maybe I'll pull the old one out and have you refurbish it for me? ;-)

 

I wish we lived closer together, I'd be happy to teach you how to do the rebuild yourself! I'm sure there are lots of YouTube videos on soldering. One note: you don't want a soldering gun anywhere near a circuit board because it's tip is too large and it's heat transfer is too great - it can easily damage sensitive components. For circuit board work you want to use a soldering iron, preferably one in the 15W-30W range. I use a 20W or 25W iron with a 1/8 inch chisel tip.

 

Kind of ironic that my blower module just packed it in and now I also have to do this repair...

Just ordered the parts from RS Components, pack of 10x Thermal Fuses (min quantity) and 3x MOSFET's so I have some spares. $20 including delivery.

Andy, if you take the module and the parts to a shop that does electronic repairs they could do it for a lot less than the price of a new module.

Does not have to be an automotive electronics specialist, I would ask around for someone who repairs amplifiers or electric guitars for musicians.

Musicians are usually broke/poor so the work gets done cheaper, if you say "i have this part off a Jaguar" then it'll be $$$$ but if you say "can you solder a couple of components for me" then it's not a big thing.

I used to be a poor/broke musician btw...but I will do the soldering myself, luckily for me i learnt how to do it as part of my "real job"

 

Yep. I learned to solder because I too was a broke electric guitarist. First thing I ever soldered was a pair of power supply filter supply caps in an old Gibson amp to replace the original dual electrolytic. My dad diagnosed the problem just by listening to the amp, then tought me how to solder (very handy to have a dad like that!).

anindyam, I ordered my power mosfets and thermal cutoffs from DigiKey, but Mouser probably stocks the same parts and they're in Texas. As Cambo recommends, the parts are so cheap it's prudent to order at least a couple of each. If you don't have any musician friends, Austin is full of recording studios - just stop in at one and ask who does their electronic maintenance.

The one thing I discovered was that in hot weather, the new components failed for the same reason the original ones did: insufficient cooling by the shorter-finned original heatsink. It's worth doing the repair with the original heatsink the first time just to see if it will last, but if it doesn't, you'll either need to find or fabricate a heatsink with longer fins or buy the upgraded Jaguar BCM (I assume the rear BCMs were upgraded with longer fins, but haven't confirmed this).

Cheers,

Don

 

I was a broke SW guy when I was younger. I could've written the FW used in all of these modules back in the day. But years of being in Sales have usurped most of my technical abilities. ;-)

SNG Barratt says they can get me one for around $200, but it'll take a week to get to me. I'll probably go that route because I need to get this up and running before the heat of summer hits us, or my kids will scream at me.

But one of you guys that are handy with the soldering iron ought to offer a refurbishing service. There are plenty of XJs out there and many of us have had to replace the front control module. And you have to buy the FETs and other items in bulk anyway...

 

Btw, here's the page from the Workshop manual...

 

Heck I used to do nothing but solder for work. I'd be interested in doing these repairs. I haven't had an issue with mine to do this yet, but it can't be difficult once I know what I'm looking at. I used to solder key fob boards to use another module to control locks in a car.

 

Hi Torrid,

Be careful what you wish for!

Replacing the mosfet and thermal cutoff is easy. The real problem is that you'd be hard pressed to warrant your work because the reason those components fail in the first place is that the original heat sink has insufficient thermal dissipation (excessive thermal resistance?). As long as the original heat sink is used, there is no wat to be sure the components won't fail prematurely again. Jaguar had the BCM revised with a new heat sink with longer fins. See the post below for the solution I came up with, which has lasted over a year so far:

https://www.jaguarforums.com/forum/xj-xj6-xj8-xjr-x350-x358-28/blower-control-module-bcm-rebuild-new-heat-sink-126502/#post1058751


Cheers,

Don

 

I see what you mean about the heat sink. If I can get a solution worked out for that I can see this being something I could offer. I had been doing alarm and remote starts as side work, but with a family this stuff is just too time consuming.

 

Where do you get a discount code for Gaudin? I searched forum and web for Gaudin promo, discount, coupon. Only found a couple of out of date or invalid ones.

I'm finishing off a shopping cart with Gaudin and there's a box marked "Enter promo code".

Or do you just mean their prices are cheaper than most other suppliers?

 

Yeah, Gaudin is probably the cheapest around online. They are my local dealer and will usually honor the online parts prices when I go into the dealer.

 

Yes, Merriam's and Gaudin's everyday online prices are substantially lower than the Jaguar list price. Our local Jaguar dealer often charges prices that are above Jaguar list price, so even with the cost of shipping and handling, it's usually less expensive to order from Merriam or Gaudin. Compare them both, including shipping costs, because that can sometimes make one cheaper than the other.

I don't know how to get a discount code for Gaudin, but if you find a way, please let the rest of us know!

And don't forget that the good independent Jag parts suppliers like Coventry West, SNG Barratt, Jagbits and Welsh Enterprises can often sell you the same part, made by the Original Equipment Manufacturer (OEM), without the Jaguar markup.

Cheers,

Don

 

Lol I would but I stopped looking, and I had a good search. Have ordered from Gaudin. Checked Mariam's can't remember why I didn't continue with them.

Going off topic here a bit I know but for anyone interested here's my comments about them.

They all seemed to be more expensive overall than Gaudin.

Except Welsh Ent for some parts but it's not clear whether they're selling OEM, OE, or aftermarket. I asked them (email) about one part and got a vague response saying parts were aftermarket but they didn't know who manufacturer was.

 

We sell the module under part number C2C39577 for $257.85 and we offer a 10% discount to forum members by entering
JAGFORUMS-10% in the coupon code box when checking out. Free shipping also!

 

Hi Auspuff,

Welcome to the Jaguar Forums!

I note that you have made 12 posts to the forum already but have not yet posted an introduction. Please visit the New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum and post an intro so we can learn something about you and your Jag and give you a proper welcome.

Cheers,

Don