OK the rubber elbow on my AIR diverter valve (if the elbow itself isnt it) keeps getting so hot that the elbow gets very brittle and eventually starts to crumble apart. It does this like 2 days after I drive the car. I put in a 160 thermostat and thought that might be the prob so I put the stock one back in, but I dont know if it is. I might be replacing the intake gaskets next it I cant figure it out. Anyone know what the problem could be?