Anybody heard of this problem?
I have a new water pump (remanufactured pumps from Napa) with metal impellers that squeal when the engine gets up to temp. I have replaced the pump several time and encounter the same results. One of the pumps was even a Bosch. It is hard to believe each pump is bad.
Before you ask:
1. Yes, the correct belt is installed
2. Yes the tensioner has been replaced, I even tried increasing and decreasing the pressure, no effect once the engine is hot.
3. Running Prestone antifreeze 50-50, added Prestone rust inhibitor/pump lubricant.
4. checked pulley alignment
5. Engine does not run hot, needle is centered. I wonder of the temp is to high/hot for these pumps despite what the temp gauge is indicating.
6. Fan comes on as expected.
7. Yes, the refill process was followed per the shop manual. I wanted to make sure there was fluid in the pump before starting the engine.
8. No antifreeze leaks
3/15/06 - I have pretty much eliminated the water pump in favor of the steering pump. I purchased a electonic-ear so I could try and isolate the noise. Detection of the noise is difficult because of the close proximity of the steering pump and the limited room to access this area with the engine running etc. Even with ear it is tough because of the echo effect around the running engine. The steering reservoir was down on fluid, adding fluid has muted the noise, hence the shift in focus. I am afraid the bearing is scored in the pump at this point although there are no rough spots or noise when turning it by hand. A replacement pump is spendy $260 so I am looking for rebuild kits. I may have found a kit at
www.jonko.com/auto_parts for $36. I will try and let everyone know how this efforts addresses the problem.
The final resolution>>>>>>> This problem/noise was finally traced down the front crankshaft seal $5. Because this is located behind the balancer it was creating an echo which was very hard to trace. Had to believe a seal would make this noice, but that was the problem. What a pain this was.... Oh by the way you need a special tool to lock the crank and remove the balancer.