Put my 300TD away last year for the winter and now only blows hot air. AC was weak last year but still working, now HOT on everything. Put new thermostat and heater selanoid dewhicky thing in. Anybody know where there is a heater troubleshooting page or can diagnose this. On the other hand, the wagon started first crank and runs like a top. Diesel purged it yesterday and ready for the summer yahoo!!!