Thinking out loud.... A flat plate heat exchanger that's bonded to the top of the PEM using a thermal adhesive might do the trick. A few plates of something like this: http://www.aavid.com/sites/default/files/products/liquid/pdf/liquid-cold-plate-datasheet-hicontact.pdf Aavid can custom design a plate as wide as 250 inches. This plate is only 0.6 inches thick. Does anyone know if there is enough clearance above the PEM for this? The plate can be bonded to the top of the PEM surface using a 3M thermal adhesive. The plates would have to be routed to a small electrical pump and then another heat exchanger mounted on the bottom of the vehicle. Tesla should have done this inside the PEM (there are some pretty good liquid cooled IGBT solutions out there) but<br>outside the PEM should help considerably too.