Truma Climaster noise

Hi all,

We're newcomers to caravanning and have recently completed a shakedown trip in our newly acquired Supreme Outback van. Other than a few niggling little problems that one would expect in an 8 year old pre-loved unit, we have no real complaints except one.

The air con unit makes enough noise to wake the dead.

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While I expected some noise, this has, especially outside, a very loud fan noise that made us embarrassed to run it in caravan parks. It would certainly cheese me off if I was parked next to it on a hot night. The noise inside is less obnoxious, being more vibration than fan noise, but SWMBO has the unit under her bed and is not a particularly happy little Vegemite.

I've made sure the filters are clean but suspect this is not the problem as the airflow seems to be OK. The cooling isn't brilliant, but it makes enough difference to be worthwhile if it would do it without sounding like a Fokker Friendship 20 feet away.

OK, here are the questions for the team-

Are these units naturally very loud?
Is there something that dies in the fan unit? (Although it doesn't sound mechanical in origin)
Has anyone come across this or a similar problem, and even better, come up with a solution?

Buying earplugs for all the good folk in a caravan park doesn't seem to be a good option!

Cheers,
Chris