why would overfilling make the noise go away?GAR said:I talked with my service dept and they said that the TSB indicated to overfill when the symptoms occur. They indicated that I should not just overfill because the few with the problem are fixed this way. I would leave it alone unless you have the symptoms. Ours has been fine from the factory.
Actually, I believe the technical term would be pump cavitation. This is a lack of continuous flow of fluid through a pump that expects a continuous 'fluid bath' and causes the impellor to "suck air' thus creating cavities in an otherwise continuous strean of fluid. It causes the pump to make noises and decreases the efficiency of anything the pump is used to activate.Damron said:I participated in another post related to the Power Steering at http://www.acadiaforum.net/forum/index.php?topic=2769.40 It discusses using the "1/4 inch" overfill method on the powersteering. It might be helpful.
Some possible reasons the "1/4 inch overfill" solution works: Perhaps the Power Steering reservoir on the Acadia is simply slightly too small (i.e. the "full" mark was mis-marked lower than it should have been by the manufacturer). Not enough fluid to properly suction feed the power steering pump can cause "whirling" noises when the pump is running (when the steering wheel is turned). Imagine the gurgling noises associated with whirl pools, like bath water draining, but at a higher frequency as the system in the Acadia is much smaller and faster. Reservoir levels are designed to have enough fluid in them to prevent this from happening. Maintaining a higher fluid reservoir level provides enough fluid to prevent the whirl pool effect and prevent fluid bubbles (foaming). Additionally, any motor designed to be submerged in a given amount of fluid is louder when it is not submerged as designed. Less fluid = less sound insulation = louder noises.
wow are you serious!speleos said:Actually, I believe the technical term would be pump cavitation. This is a lack of continuous flow of fluid through a pump that expects such. It cause the pump to make noises and decreases the efficiency of anything the pump is used to activate.
Please, be very cautious when doing an "overfill" of the p/s reservior by yourself. Don't over do it! Someone did that on one of my company vehicles and caused an underhood fire when fluid was pushed out of the reservior cap onto the exhaust manifold. Luckily, I had a handy fire extinguisher and prevented a complete vehicle melt down.
I can't believe that really worked and still baffled how this would do it. i mentioned it to the service manager and he said that was impossible? he said when you hear a noise like that it means that the fulid is to low and when he checked mine it was on the level mark..i'm to afraid to fill it myself..after reading speolos story .big bear craig said:Mine was making a groaning noise when turning the steering wheel right or left. Over filling 1/4 " cured the noise. Just remove the oil filler cap and pull straight up on the engine cover to access the p/s pump.
did you do this when the engine was hot or cold?big bear craig said:Mine was making a groaning noise when turning the steering wheel right or left. Over filling 1/4 " cured the noise. Just remove the oil filler cap and pull straight up on the engine cover to access the p/s pump.