Seeing as how you are at the mercy of a mechanic you're stuck and have to go by what he says. If its RPM related that would cause me to lean towards the cooling system also but it just doesn't make sense. Any cooling system should make more than ample heat at idle (save for certain diesels) to blow hot air especially since he says the heater core gets hot.
Download the HVAC section of your Murano found here on the site and have a read. There are usually troubleshooting steps found at the ends with cause and effects. Could help you out.
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2001 Nissan Sentra GXE
2006 Nissan Murano SL
2006 Nissan Pathfinder LE
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