SOURCE: It's been a hot summer,
Hi, you either have a blower motor intermittent fault or a programmer fault. But i think it's a blower motor fault which you need to replace immediately and it is located under the hood in the back towards the driver's side...
SOURCE: 2001 Buick Lesabre lifters noisy
Have you tried flushing the engine crank case? You may have sludge clogging the valve lifter oil pressure ports. Get a can of Berrymans brand Chemtool, add it to a cold engine crankcase oil and run it for 5 miles or so, then change the oil and see if the noise level improves. Some tapping noise on cold start is normal and not a sign of any problem. If the noise goes away in my opinion I'd just do the flush of the system and then leave it alone.
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