Well, my '04 XJ8 sedan has developed a droning noise. It starts around 55 mph and continues to about 70 mph; and then the sound kind of gets lost in normal road noise. The noise doesn't seem to be coming from the front or the rear in particular. And I can't detect any unusual vibrations in the steering, etc.

It started around 90K miles.I had the dealer check for wheel bearing and U-joint problems, and none were found. The Tech thoughtit might be the tires. So I have replaced them. I now have about 100K miles, and I think the noise might be getting a bit worse.

Oh, the noise is there whether the A/C is on or not. And road surfaces don't seem to matter.

Any ideas (please)?

 

Is it consistent between those speeds or does it change with speed.
Front bearings on your car are hard to diagnose as they make noise but no freeplay normally.

 

Dear Jag Tech,

The noise is consistent; i.e., the pitch doesn't change with speed, onlythe audio level.

I'm going to do some experiments today to see if it's drivetrain. Maybe it's wind noise around the sun roof seal or ??

relinuca

 

Where are you located relinuca?

Really never had any problem with 04 sunroofs. I would run hand over the inner of the front tires and see if they feel choppy. Run your hand around the inner tread, back and forward. 10k is a long time for an alignment issue to show up. I know they are new tires, but that doesnt mean anything in the noise department.

 

I'm in Jacksonville, FL.

I have now closely checked around my sunroof, and everything looks good. I've always detected a very slight wind noise when the sunroof is closed, but closing the interior panel mutes it just fine.

I'll check those tires carefully today.

Thanks,

relinuca

 

I am in SoFL.

Long way from you but I am up in Orlando periodically. Not far to you from there if you other things done sometime.

 

Dear Jag Tech,

A lot seems to be happening all at once with our faithful Jag. A Check Engine light came on for a few days recently-will be taking it into get error codes pulled on Wed. Yesterday, Iloaded a new Nav DVD and discovered the A/Cwon't come on!

I assume the NAV DVDonly contains maps, listings, etc., and doesn't relate whatsoever to the HVAC system. Very weird, though.

Murphy's Law...my extended warranty just expired recently, too.Bummer.

 

I jacked up the front wheels and checked for play...everything seems fine. I also checked all four tires as you suggested for cupping, etc. And they seem fine, too.

Maybe something will come up when I take it in to the local dealer on Wed.

Relinuca

 

Let us know.
When you say the a/c doesnt work.....can you explain a little more. The blower doesnt work? The a/c controls do not work on touchscreen or hard keys?
A/c and Nav are tied in a bit. Share the same control panel remember.

 

Dear Jag Tech,

Neither the touch screen nor the buttons will activate the A/C. When I touch the A/C position on the screen, it "halo's" fine, but the A/C does not come on. Likewise, when I push the Auto button for A/C, the button light comes on but no A/C. Plus thefan does will not operate, regardless of what I do.

Relinuca

 

So everything is working as it should other than no fans?
If this is the case, you need a blower motor resistor. It sits on top of the blower casing behind glovebox. If you dont know what you are doing can be a pain in the you know what to change.

 

Yep; you're right. The local dealer said the same thing...a blower resistor accessible through the glove box. I decided to let them change it. If I were in Cincinnati (summer home),I would have my garageand tools available for such things.

 

Sometimes you can reach up and smack the blower motor and it will come back to life for a while. A piece of solder breaks off inside the resistor pack. Can be repaired but part if only $100 something anyway.
Good luck

 

ourprice is so different then your's last year i quoted a resistor pack for blower in my shop the reisistor pack was $1100 was way overpriced

 

Thats scandalous Genius. Have you tried to repair it? Easy to do.