I've just recently completed the install of my empeg into my Honda del Sol. With the heat set to 'full' it takes about an hour of highway driving to get the High-Temp warning.
There's not much room for air circulation in the console and, even worse, ducts on either side of the console are fed by channels on either side of the head unit- virtually ensuring a heated environment for any ICE.
For the short term, I'm thinking about a simple 12V fan and a switch. <shrug>
For the long term, I'm watching this board for good ideas...