3.0 tdi CDUC ( AC possible problem )

Hi

just a quick question. Could a faulty ac compressor cause enough problems on engine load that you would notice slight power loss or like the engine is dragging something?.

also Can faulty AC cause a rattle only under load but not necessarily during idle ?.

many thanks

It’s really strange.

at first I thought it was an injector problem. It sounds like a proper diésel clatter noise when accelerating and I noticed it was very intermittent.
If I switched off the Ac and put the temp to high for 5-10 mins the noise would suddenly disappear.
With the AC on I can hear a kind of injector pinging noise that I thought was the injectors only to find it comes and goes when the AC is toggled on and off.

I have also just measured engine load while at Idle

15% Ac off
35% Ac On

don’t know if these numbers seem excessive with the AC on ?.

thanks

Many thanks for the reply.

I can’t see any wobbles and the belt seems firmly in one place and not jumping around at all.
But your right I need to take the belt off and test the car for rattles.
It’s definitely only happening when the AC is On.
If I leave the engine running with the Ac off and the heater on High it will make less rattle.
Sound is very similar to injector pinging similar to when the car is in too low gear and you floor the gas and you get the pinging noise.