2006 Avalanche 2.0, hearing click-clack noise coming from crank under heavy pedaling- bearing noise???

go to the magicmechanic website and send him this--hes the best there is and will rply

Check for caved in area on your deck housing. Also your spindles for bad bearings or broken housings.

if your fuel pumps not kicking on try looking under the hood in the fuse box for relays there black boxes 1in by 1in and have some one get in the car and turn the switch on and off while u hold each one if it clicks when the key is turned its good and if not swap it for one that does to rule out the fact that it might be a relay that requires the car to be running to come on

there is loose contact with the heater wiring

cv axles going bad?wheel bearing? but you said clicking so i would say cv axles, if its manual check trans fluid, humming can also be the alternator increasing sound with speed overinflated tires etc be a little more descriptive click click? tock tock? clack clack?left side? right side? only when turning? is the licking and the hummming together or seperate

What you may be hearing is called "octane ping". It occurs when the engine is under heavy load and the fuel does not have enough octane to efficiently run the engine. Older engines like yours were often run on premium gasoline to avoid this. However, if you do not have the clacking when accelerating on level ground and only have it on the steeper hills, it is not necessary to spend more money for mid-grade of premium fuel. Only if the engine makes the noise under normal operation is this advised. A little octane ping in those situations will not hurt the engine. But, if you need the peace of mind, and to ensure that the clacking IS octane related, I would try one tank of premium and retest the engine of a hill you know causes the problem to see if it goes away.

If it clunks once per revolution, it could be the crank bearings. The brake would make a more rapid noise due to the way it is geared.

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it sounds like the relay in the module for the heated seats that could be going nuts due to a bad wiring connection. most likely a ground.

have the water pump bearing checked as well as all the bearings for the drive belt for the accessories

try the bearings.