My 89 Bonneville is making a clacking noise Do u think its my harmonic balancer? bcuz the belt has play.?

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What is the main cause for a check engine light? Oil, trans, radiator are all fine.?

The harmonic balancers on those era GM cars are known to fail. They are part steel and part rubber and as the rubber deteriorates the crankshaft pulley turns and moves when it shouldn't. This will make a clunking sound whenever the engine is running.

Tranny hesitates to shift from 2nd to 3rd and revs high when engine cold, when warm it shifts ok. ideas?

Get a good light and look at the harmonic balancer on your car. If the rubber is broken and loose between the bolt in the center and the outer part of the pulley that the belt rides on then you need a new balancer. If that's okay then look at the belt tensioner or even bearings in the water pump, power steering pump, idler pulleys or alternator that might also make a noise. Just take the belt off and spin each component and listen for dry rubbing sounds.

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if the belt has play the tensioner prob needs replaced

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Toyota 18-RC misfire problem.?

if you remove the serpentine belt and the noise stops then you got it. or remove the belt ,reach down to turn the balancer by hand ,if the balancer is bad you will be able to rotate it about 3 or 4 inches and you will hear your noise

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