Herschel,
Muth I believe only makes replacement mirrors with heating elements and LEDs for 2001 & 2002 PTs with heated & folding mirrors, not the base PT or 2003 and up. Those mirrors are non-folding and a different size. To answer your question, yes, your heated mirrors will turn on and off with your rear window defroster.
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John & Terry 
"His" - 2002 Inferno Red Touring Edition
"Hers" - 2003 Electric Blue Limited Edition
Del Val PT Cruisers
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