Update: Toyota has missed it again. The replaced water pump failed to solve the loud whining noise when the engine is cold. This is really getting frustrating. I don't understand why it is so hard for class A machanics to locate the source of such a loud noise.
If the problem was a vacuum hose as suggested by one of the members, would I not see a check engine light come on? Could the problem be comming from a hole in the exhaust pipe at the front of the engine underneath that silver protective hood? If so, would the noise stop when the engine warmed up as it now does?
Any further suggestions would be appreciated. Toyota is not very helpful with this particular problem.
Thank you,
Bill
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