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Is your microwave oven set to full power when the intermittent noise occurs?
If it's set to a lower power rating, then the noise you describe sounds perfectly normal. At a lower power setting, the device which creates the heat or microwaves, called the magnetron, switches on and off intermittently so that the food etc. is not cooked too fast. This is quite normal & you should only be concerned if the noise occurs while the microwave oven is set to full power. In that case you will have to have it checked out to see what the cause is.
a microwave is measured in watts,, not by temperature,, it works by passing microwave radiation through the food or drink, it is called dielectric heating,, so in other words it depends on the power setting and the time it is set for that determines how much the microwave radiation will pass through
Is there a wall behind where the microwave is to fit?
Most of these ship with a mounting plate and instructions for mounting to the wall. In fact, the wall bracket carries about 1/2 the weight, and the overhead cabinets carry the other half. The plates come with a good set of instructions for how to install.
Whirlpool is sending you to a distributor because they have to watch liability in this litigous world we live in..