Td5 suspension compressor ‘dead’

Good day all, it’s that common conversation again......... air suspension on my TD5 2004
Changed both air bags doe to one leaking and other looking ready to go (kept as emergency spare)
Usual quick job, but now the compressor won’t run, I’ve checked doors & bonnet are shut, checked fuse and swapped relay.
Compressor was running apparently ok, but now nothing.
Ride sensor appear free both sides.
Is there something obvious I’m missing or just coincidence and it’s going cost me another £300 (plus vat) for a compressor.
Thanks in advance

This is quite common IIRC. With all the doors etc closed and ignition on position II, jack up the rear on the towbar, then lower it, go up and down a couple of times, and that should kick the compressor into life.

I had to check the date there to see if we’d gone back to beginning of April.
I’ll try anything to save the cost of a compressor, so how does it start the compressor? Via height sensors or air flow from the bags

Haha!! For some reason, not sure how, the compressor goes to "sleep", and needs a kick, ie. large movement of the ride height sensors, to wake it up. Can't explain more than that, sorry....!
But it does work, well documented elsewhere on D2BC.

Hellastony said:

This is quite common IIRC. With all the doors etc closed and ignition on position II, jack up the rear on the towbar, then lower it, go up and down a couple of times, and that should kick the compressor into life.

Click to expand...

surely you need the engine running, not just key in position II?

Plus to the OP compressor rebuild kits aren’t a lot but first you need to find out why you are not getting power to the compressor, am sure somebody will be along to say how to test the compressor with a “Hotwire”.

J

You don't need the engine running, but it certainly might help with the amount of power needed to drive the compressor. I thought you had power to the compressor anyway, or more precisely, as it was working nothing had changed to suggest there was no power to the compressor. Have I missed something, as regards marjon's post reference to no power? But as he says compressor rebuild kits are reasonably priced, but if it was working prior to the bag change, then assuming you haven't fiddled with anything else, the compressor should still have power and therefore work. Sometimes they just need a jolt into life after a bag change and are right down on the bumpstops.