The best way is to pull the water pump and harmonic balancer (and everything in the way) and timing chain cover and look at the condition of the timing chain and sprockets. If they are badly worn, it will be obvious. Chain will be very loose and teeth on the sprockets will be worn or missing.
The only way to see if the blend door is moving is to actually look at it while you are operating it. Unfortunately, that is nearly impossible. But 9 times out of ten if the hot water is circulating and the heater core isn't clogged with dust and dirt, it's the bland door. Buy a whole set of...
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