the noise your talking about is caused by air in the powersteering system can be caused by 3 things powersteering pump, steering rack seals and air in the system so the mechanic either needs to bleed the air out of the system and if he has replaced the pump already it shudnt be the pump id maybe do a powersteering flush and bleed the air out of the system and see if that fixes it if not u might be up for a reconditioned steering rack and maybe suggest going to a differnt mechanic changing the rack in a v6 camry 99 is a big job i have a 98 camry v6 with a 1mz-fe engine and i am about to replace the rack in that and all my serivice books tell me its a 5hour job anyhow good luck with ur car make sure he uses a dexron 3 automatic trans fluid or powersteering fluid some of the ford powersteering fluids are alot differnt