The Climate control on my 2011 X351 works fine on the RHS of the cabin but the LH (Nearside) of the Cabin only blows Cold air front and Back.

If I perform a Hard Reset by disconnecting the Battery for 10 minutes then re-connect the system works fine for a few days then I lose the Warm Air on the LHS again. another re-set restores proper operation for a fed days.

Has anyone else had this problem?

I have obtained a known working Climate Control (ATC) Module. has anyone replaced one of these modules which I understand is mounted in the passenger footwell? Does anyone how to access the module for replacement?

Any help would be much appreciated.

Thanks Phil

 

Are there any codes set?
Those types of codes are deeper and take a better scanner to see them.
But I would try to get codes before replacing anything because the car is so complex you can't repair it by guessing.
Maybe even use the dealer?
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Hi, yes, I think you may be right. I have booked it in to our local Main Dealer (Wolverhampton, UK) on the 19th for them do do a Detailed Diagnostics Check. It will be interesting to see what they find.

I read in the X351 manual that the Climate Control System is sensitive to Low Battery Volts at Engine Cranking and I do get the "Low Battery Start Engine" warning occasionally so that may be related.

Can't see it being a real big issue (fingers crossed) as it works perfectly after a Hard Reset but only for a few days.

Thank you very much for your reply and I will let you know what the Dealer Diagnostics find.

 

Well with that added info I would compare the cost of a new battery with the cost of going to the dealer. You are very correct that a battery problem could be causing this. So if you go to the dealer you may be purchasing a battery anyway along with the dealer charges.
How old is the battery? You did not give us any car details?

Unless you are under warranty?
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Hi, good morning and thanks again for getting back to me. I have a 2011 XJ (X351). No Warranty cover unfortunately.

I had a new Battery fitted at Halfords in January and actually took it back a week later because of the "Low Battery Start Engine" warning which hadn't gone away. Halfords checked the Battery and Alternator and all was good but they replaced the New Battery anyway.

The low Battery Warning now only appears occasionally.

As I said it is booked in on Thursday so I will see what the diagnostics come up with.

Thanks again

Phil

 

The question is was a proper battery fitted. It has to be an AGM (Absorbed Glass Mat) as these have a slightly higher voltage and can operate our XJs properly.

 

I have just checked and Yes the Battery fitted by Halfords is an AGM type.

 

Hi,

Here are my quess: Please check engine ground cable. Yours have been underside of the engine 9 years. When it start oxide badly the high current, like engine cranking, will "weld itself" thru, but much lower charging current from alternator might not, so you end up low charge on battery. Naturaly check the battery terminals as well, even the battery are in quite nice enviroment inside of trunk.
It also might be so that the battery module just have been confused and needed to reset by SDD software. (it should detect new battery itself, but...)

 

With your additional details I need to ask does this car get driven very much?
Because with a new battery you should not be getting the low battery messages. Low mileage is always tough because the car does not ever get back to full charge.

How far from the car are the keys stored?
Do you fully lock the car when it's parked?

I don't like to suggest this but it has been proven by a number of forum posters.
Consider installing a battery tender and plug the car in while parked in the garage.

One thing I have done is installed a cheap cigarette lighter volt meter that I put inside my console. It has 2 USB ports too for charging. It was only $8 off of EBay and at least I know what voltages the car is seeing.
I am one of the lucky ones and my batteries last between 7-10 years on 2 separate Jaguars I have owned. I don't know why I don't have any battery problems?

My 2014 XJR is still on the factory battery and the car was put into service in Sept 2013. So I am over 6 years right now on the original battery.
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Most "brand new" batteries aren't fully charged when installed because they've been sitting on the retailer's shelf for months slowly discharging. That's why you should either have the retailer fully charge it overnight, the day before it's installed, or charge it yourself at home.

Batteries face premature death from weather (too hot or too cold), inadequate charging (short trips only, not driven enough, bad alternator), abuse (pothole impact causes internal battery damage, overcharging causes electrolyte loss), and other factors (convenience mode computers don't shut off timely and drain the battery because doors are not locked or keys are left in the car).

I don't drive my XJ isn't enough to keep the battery fully charged. That's why I keep it on a CTEK battery maintainer when parked in my garage. I've never had any electrical problems.

The first thing to do if you have an electrical problem is to make sure that your battery is fully charged and that it can hold that charge overnight. If not, buy a new battery and see if that fixed your problem.

 

Thank you all for your very helpful suggestions. I will check all of the Ground connections to make sure they are sound.

The Car is driven regularly as was my previous X351 which never showed any Battery Low indications. I have started to store the keys well away from the car and in a Shielded wallet and the Battery Low warning does not come on anywhere near as much as it used to but I am still wondering if something is draining the Battery while the car is parked overnight.

I can't help thinking this is a Battery/Electrical problem as every time I disconnect the battery Positive Terminal even for just a couple of minutes and then re-connect it the Climate control works fine.

The car is booked in for a full Diagnostic check on Thursday so I am hoping for a result from this.

I will post the results on Friday and thanks again you guys.

Phil

 

Just a note about ground connections?

The XJ is all Al. so these ground studs will break off if you just look at them! Torque on the studs is very low I think about 13 N-M.
If this happens you can repair this by drilling a hole and replacing the stud with a SS bolt and lock washers to bite into the metal giving you a good ground.
Now I don't know why but grounding is a problem with AL. bodied cars and they have a lot more ground points than a steel car.

Here is a thread on replacing the stud with lots of details.

Broken Ground Stud
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The only think I can add is that the heater matrix on the previous model, (X350) was notorious for silting up. I very much doubt the X351 heater is any different.

 

Hi Everyone,

I seem to have solved the problem!!!

The JLR Dealer called on Monday to cancel the Appointment I had today for them to do a Diagnostics Scan due to Staff Shortages because of the Coronavirus outbreak.

So after reading some other threads on here I ordered an Autel AP200 Diagnostics Scanner off Amazon for £59.99. It arrived Yesterday!!

I took the car for a run to get everything warmed up and sure enough only Cold Air on the Passenger side (Front & Rear) again.

I got back home, plugged in the scanner and used it to re-set the Battery Monitoring System by telling it that a new Battery had been fitted (which it had by Halfords). I then unplugged the Scanner and started the car.

Hey Presto, the Climate Control System worked perfectly with Full Control of All Four Zones. Each one with fully Controllable Temperature.

I think that this Brilliant Scanner is going to save me a hell of a lot of money!

As an Aside I did have this Problem on a previous X350 that I owned and That was a chocked Matrix on the Drivers side. The X351 however has a Common Matrix for all Four Zones.

I will follow up with a report in about a week to verify that this is a permanent solution (Hopefully)

Thanks again guys for all your input and help.

Phil