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if the engine heat was the method of heating up the bimetal then why would the heater be necessary as the engine heat or lack of heat would perform the same function,
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Yes it would, but it would take much longer for the mixture to get leaned out.
There is no outside air flowing through the WUR via the vacuum lines. If it were to do so, it would be called a "vacuum leak" and would need to be fixed. Try blowing into one vacuum line and see if you get air out the other. If you do it's because the internal diaphram is torn, not because it's suppose to work that way.
Your hypothesis about how the WUR works is wrong.