Just an extension of Tony Tiger's post about adding a fan. It really does work. We have a houseboat and the side with the refers (yes plural) is often baked by the sun. Our refrigs have vents at the bottom and top and air is "supposed" to curculate by convection. But when it's 100+ outside, nature just don't get it. We went to a electronic surplus store and picked up some really good 4" 12VDC "muffin fans" for like $8 each. We then built some plenums to stand them away from the vent slats a bit so they would move air better. The refrigerator has 12VDC to it to run the ignition module so we pulled power from there. We bought an adjustable thermostat and put it inline with the power. We adjusted it so that the fan comes on when the temp inside the vent housing gets above 95. We pull air in that the bottom and push it out at the top. The fans are really quiet, don't draw much power and the refrigs work very well.