LS400

Where are the sounds coming from? Under the hood? From the dashboard? Does the sound vary with the engine speed or vehicle speed?

There is no record of the dealer's repair record on line.

The chirping noise comes from under the hood, near the front I think. Thanks!

Thanks for the reply. The chirping sound comes from under the hood. When cold start (30 degree F.), after the initial loud squeak , the sound doesn't vary with the engine speed or vehicle speed.

It is kind of difficult to diagnose a sound that doesn't vary with engine or road speed. A loud squeal at startup is often a loose accessory drive belt, but a chirping sound that doesn't vary kind of rules that out. Do you have the air suspension and does the back of the car sit a little low after sitting all night? I wonder if the compressor is making noise.

Hard to tell without more descriptive information, but if you have quite a few miles on the 400, I would check out the fan bracket. They go usually in the range of 125K-150K miles. If that is it, you have to replace the entire assembly, and not just the fan bearing. Watch the fan when it is running, and see if you see it wobble a little. Just a thought....good luck.

I will have the accessory belt checked out. This car doesn't have air suspension. THANKS AGAIN!

You're welcome and good luck! BTW, you might wish to check the cooling fan as someone else suggested.

I have a 1990 LS 400, 62,000 miles, yearly dealer maintenance. I will have the fan belt checked out. Thanks for the reply!