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I have a 2004 L322 autobiography thought i would share a few issues that i firstly assumed were independent but are all linked.

8 months ago i noticed the car when starting was idling high and then a few weeks later it wouldn't start.
After jumping the battery I took it to Landrover who said they needed to plug it into their computer system but their computer was down, this was a booked appointed so why the couldn't have told me before i left - awful customer service but that's another story, so took it to a specialist - much better service.
They checked the battery - was all ok and no big drain. They said they would keep it in their garage for a few days with the drain monitor.
They noticed that randomly the interior fan would get triggered - this was draining the battery - a known issue with BMW's so they changed the heating resistor and all was ok for a few weeks.

I then noticed that the remote Webasto pre-heater wasn't working - investigated in replacement.

Then it failed to start again - flat battery.

In the mean time i arranged to replace the internal heater, i spoke to Webasto who were great but said i needed to go via Landrover - after checking the wiring diagrams and did some checking on the internal heater i found the problem was the remote receiver - i found it in the boot and it was full of water! By the look of the circuit board it had been filling with water for years.

After stripping the car down with a very good window replacement specialist mechanic we found the leak coming through the boot seal, that looks fine until you remove it and find it has rusted at the back and resulted in a small opening around the top two corners of the boot. Unfortunately this also corresponds with a gap in the body panels and when opening the boot after rain a stream of water would rush down and via capillary action would pour inside the car panel filling up my Webasto receiver (luckily not the other side as this would have taken out the sat nav and computer).

So the high idling was due to the car knowing the battery was low and trying to recharge it quickly.
The bmw fan resistor may have needed replacing but perhaps not (only £50) but keeping the car inside dried the Webasto out enough to stop it triggering the internal heater.
When the water built up in the receiver again it started randomly triggering the heater draining the battery, somehow overriding the low voltage protection relay.

Have replaced the boot seal and replaced the Webasto receiver with the new fancy temperature read out remote - all good so far (4 months).

Hope this helps someone with similar issues - if you have an L322 i would recommend you check the boot seal - gently pry it away and check the steel internal stiffeners haven't corroded - i have also filled the gaps in the body panels at the top corners of the boot seam where the boot seal sits.
 

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2002-2005 Range Rover MkIII / L322
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Hey mate, I'm so happy you posted this because I think this problem might be occurring with my Rover as well, which just happens to be an 04 as well. I thought it was the FSR at first so I replaced it and boom, I left the vehicle alone for a week and no drainage, but what bugs me the most is that if I leave it without driving it for more than 2-3 weeks, battery dies, so annoying. I also have a GL450, left that thing standing for over 2 months at least, and it starts up just like the battery is fully charged. I will definitely have a look at the seals, I hope that's the problem for me because I am tired of having the battery die on me all the time. Again, thanks for posting this.

Asad

Ps. BTW can you please take a picture of where exactly in the boot these seals are, I'm having a little trouble painting a picture in my head to it's location, thanks.
 

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2002-2005 Range Rover MkIII / L322
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Wonderful, thanks mate.
 

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2002-2005 Range Rover MkIII / L322
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Forgive my ignorance, but what exactly is this?

I then noticed that the remote Webasto pre-heater wasn't working - investigated in replacement.

Is it a Diesel engine?
 

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Discussion Starter #7
Actually its petrol, i know a little unusual for a webasto fuel burning heater.
A photo of the attached corroded seal that i replace. If you remove the seal you will see a gap in the body panel at these two top corners. Because there was a slight gap between the rubber and body - water worked its way up and then down the gap - running all the way down to behind the fuse box where the webasto receiver lives. The other corner was also going - this would lead to eventual drowning of the on board computer and navigation computer - whilst we were testing this with a hose we actually got a few drips coming through on the computer! Anyway as i said i filled the gap and replaced with a new boot seal and all good... so far....

By the way during stripping down the rear of the car to try and find the leak we took the side panels off and noticed the rubber snap fixings were in a poor state (photo shows them taped up for our water test) - at the time were sure this was where the water was coming in so replaced with new. However this wan't the problem but certainly looks a potential weak spot!

Photos attached - also photo of new seal with product code cost about £90.

Also attached a pdf of workshop manual showing removal of webasto receiver - worth downloading the full document from the net.
View attachment 20570 View attachment 20586
 

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2002-2005 Range Rover MkIII / L322
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Thanks so much mate! Will be taking a closer look this weekend, will reply back with any findings.

Thanks,

Asad
 
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