Thread: D4: Suspension will raise once system cooled message

Originally Posted by LandyAndy

I suspect you have a puncture in one of the air bags.
When the vehicle was shifted it has moved the fold in the bag sealing the leak.I suggest he gets soapy water and tests for leaks.Raise it to off-road height.
Andrew

It should detect a leak as it will realise it is not building pressure in the line and throw a suspension component failure fault and drop to bump stops before the compressor overheats.


For future reference though, the temp probe is bolted to the compressor head with a M6 torx screw.

A lot of people see this fault just after they install Llams, as they play with it for the next half hour.

I saw this fault whilst trying to inbox myself on the beach in Esperance. Lowered to normal to get it to bottom and trigger extended but it came up with that. I'd only just raised to to off-road height a bit beforehand mind, but it does seem to not take much to overheat.

Originally Posted by DiscoJeffster

I saw this fault whilst trying to inbox myself on the beach in Esperance. Lowered to normal to get it to bottom and trigger extended but it came up with that. I'd only just raised to to off-road height a bit beforehand mind, but it does seem to not take much to overheat.

When I installed my new compressor, I watched the temperature through my IID Tool of its first run - my reservoir and springs were all empty at this time - it got to 117?C by the time it got the D4 up to normal height and the reservoir up to pressure. This took about 5 minutes in total.
If a compressor is older, the plastic cover is filled with mud/dirt/sand and the inlet filter hasn't ever been cleaned (or replaced with a better, serviceable filter like I have) then it is going to take longer to build up pressure, have less cooling capacity and therefore more likely to hit thermal cut out.

Originally Posted by Grentarc

When I installed my new compressor, I watched the temperature through my IID Tool of its first run - my reservoir and springs were all empty at this time - it got to 117?C by the time it got the D4 up to normal height and the reservoir up to pressure. This took about 5 minutes in total.
If a compressor is older, the plastic cover is filled with mud/dirt/sand and the inlet filter hasn't ever been cleaned (or replaced with a better, serviceable filter like I have) then it is going to take longer to build up pressure, have less cooling capacity and therefore more likely to hit thermal cut out.

Oh cool, didn't even think to monitor its temp with my iidtool. Mines a 2009 with 228k on it, second owner. It's never been touched so I might get in there and give it a good clean. Cheers for the tip.

Originally Posted by LandyAndy

I suspect you have a puncture in one of the air bags.
When the vehicle was shifted it has moved the fold in the bag sealing the leak.I suggest he gets soapy water and tests for leaks.Raise it to off-road height.
Andrew

Safety First - always, always, always take precautions when working under a vehicle. Especially one with variable height air suspension if you suspect a leak! There is no clearance under a disco when it's sitting on its bump stops and if it decides to let go on you when you're under there it won't be a nice outcome!! My neighbour has a friend that was crushed under a car whilst working on it. They survived but received substantial injuries and took many months to recover.

Enough of the morbid stuff and back on topic, when I first took ownership of my D3, my compressor overheat on a trip back from SA to Sydney due to a faulty ride height sensor. Needed to get towed from Gundagai - NRMA platinum saved me $2100!! The good new was that it cost me $150 for a new sensor to get fitted and LR also replaced my compressor for free under an outstanding voluntary recall campaign - the car was 10 years old!!

Oztourer brings up a excellent note, always and I mean always use an axle stand on any air suspension vehicle while under it, regardless if its all working correctly or not, while I do it second nature, others might not....

This happened to my bro inlaw a while back, his mates Discovery 4 had an issue and on the side of the road they were under the vehicle, I pointed out the potential for disaster and he admitted it didnt even cross their minds.

Regards
Daz

Originally Posted by Grentarc

When I installed my new compressor, I watched the temperature through my IID Tool of its first run - my reservoir and springs were all empty at this time - it got to 117?C by the time it got the D4 up to normal height and the reservoir up to pressure. This took about 5 minutes in total.
If a compressor is older, the plastic cover is filled with mud/dirt/sand and the inlet filter hasn't ever been cleaned (or replaced with a better, serviceable filter like I have) then it is going to take longer to build up pressure, have less cooling capacity and therefore more likely to hit thermal cut out.

Sorry to resurrect this old post, but I've just had my compressor fail in my disco 3. I'm in the process of getting a replacement sent over from the UK. In your post you said you have replaced the inlet filter with a serviceable one. I was wondering what you have used? As I searched and can't find anything about servicing the factory inlet filter. Any help would be much appreciated. Thank Peter

Hi Peter,
I fitted this air compressor filter which has a 3/8 male BSP thread, and attached is an 8mm push fit to 3/8 female adapter. The air filter elements are replaceable paper ones used on a lot of small workshop compressors, and cost about $1 each online. The whole cost I think was under $15 and as you can see on one of the photos, not a speck of dust on the clean side of the filter, unlike on my OE one.