[Makis]

I am experiencing some intermittent noise (groaning) noise coming from the front after driving at high speed for a few minuts (4-5 mile). The noises comes on for a few seconds and then disappears. It appears to be the power steering pump doing it as I cannot see anything else doing it. Has anybody experience this. I have not got any leaks and I have changed the PS fluid about 2 years ago.