Thread: disco 4 2010 System cooling fault

Hopefully neither you nor the car are under water, although that might explain multiple errors.
The only part that could overheat would be the compressor, I would imagine. Do you have a device that reads/clears/resets?

There is a temp sensor on the compressor head and on the compressor's electric motor. If the car has been siting overnight and you know it must be at ambient temperature then one or the other sensor is faulty.

Without a fault reader (something like a Gap tool) you won't know which one is generating the fault. Additionally with a Gap tool you could read what values the temperature sensors are reading (erroneously) after it has been standing overnight - probably > ~150C.

When out in the bush (100s of ks from help) mate of mine encountered this problem. To get going we just cut off the offending sensor. Compressor runs until set point pressure is reached then cuts out. But it will still generate errors. The thing now complained the compressor is running but not heating up, therefore throws an error of another type. However, it will allow you raise the suspension to normal, but you won't have any fancy off road suspension functions.

Not necessarily recommanding you do the same but mate did drive for weeks with that condition until returning to civilisation.

Having said the above, if the error is occurring shortly after you start in the morning then the compressor is no longer at ambient temperature. The temperature sensors may well be good and you have a problem related to the compressor itself, maybe blocked intake due to degradation of the dessicate granules.

If the compressor is the original then its well overdue for a service, kits are available on ebay for them from a basic service to a full rebuild depending on which compressor is fitted. They overheat because the filters are blocked and it cant expel moist air which breaks down the drier descant and blocks the filters.

As loanrangie has already mentioned, the filters are blocked, a service kit generally will sort it.

Originally Posted by Ferret

There is a temp sensor on the compressor head and on the compressor's electric motor. If the car has been siting overnight and you know it must be at ambient temperature then one or the other sensor is faulty.

Without a fault reader (something like a Gap tool) you won't know which one is generating the fault. Additionally with a Gap tool you could read what values the temperature sensors are reading (erroneously) after it has been standing overnight - probably > ~150C.

When out in the bush (100s of ks from help) mate of mine encountered this problem. To get going we just cut off the offending sensor. Compressor runs until set point pressure is reached then cuts out. But it will still generate errors. The thing now complained the compressor is running but not heating up, therefore throws an error of another type. However, it will allow you raise the suspension to normal, but you won't have any fancy off road suspension functions.

Not necessarily recommanding you do the same but mate did drive for weeks with that condition until returning to civilisation.

Having said the above, if the error is occurring shortly after you start in the morning then the compressor is no longer at ambient temperature. The temperature sensors may well be good and you have a problem related to the compressor itself, maybe blocked intake due to degradation of the dessicate granules.

Cut it off? Just unplug it