Thread: D4 a/c not cooling

This morning the mechanic suggested contacting the compressor supplier regarding a possible warranty claim, seeing that it worked at idle but not when revs were increased.

I think its time to get a get of gauges to check both high and low sides before starting any work, as gauges cost less than the last pressure check.

I'll tackle the compressor not pumping issue once the gauges confirm that the low side is the same as the high side before what appears to be the need to pull the whole dash out to get to the ATC module.

Maybe clutching at straws, I've monitored periodic 12V pulsing on the valve supply from the ATC module, as though the ATC might be looking for a pressure increase response after open circuit on the valve circuit or due to nil pressure increase for an extended period of time, so I'm not writing-off the ATC until the compressor is shown to build pressure with 12V on the valve.

Gauges show high and low side pressures are identical whether the compressor shaft isn't turning or is turning and the valve is or isn't energised. Hence I assume that the valve is blocked which then raises the questions of from where did the foreign material originate and is there more floating around.

It appears from the WSM compressor removal instructions that there is little extra work in removing the compressor compared with just gaining access to the valve which would still be quite a task to R&R with the compressor so far away.

Originally Posted by Graeme

Gauges show high and low side pressures are identical whether the compressor shaft isn't turning or is turning and the valve is or isn't energised. Hence I assume that the valve is blocked which then raises the questions of from where did the foreign material originate and is there more floating around.

It appears from the WSM compressor removal instructions that there is little extra work in removing the compressor compared with just gaining access to the valve which would still be quite a task to R&R with the compressor so far away.

The compressor is fun, yes. I took out the rad pack to give me extra access but you don’t need to. I also removed the power steering pump which sits over the top of it for extra room. Mostly accessible from the wheel arch and underneath.

The WSM shows getting access via the wheel arch and although it doesn't state which way it is removed, I guess I'll find out.

Originally Posted by Graeme

The WSM shows getting access via the wheel arch and although it doesn't state which way it is removed, I guess I'll find out.

Came out the front towards the rad, but again, I had heaps of space because the rad pack was removed, which meant all the turbo hoses were also removed etc.

When changing or accessing the compressor also change the plastic fitting on the block water inlet above the compressor you’ll never get better access. It’s an absolute horror.