I just replaced (50 miles ago) my thermostat and the gaskets with it, and now I have no heat out of my vents. ALSO right after i replaced it i drove the car for about an hour and a half, and then popped the hood and found a mess of coolant. it is splattered on the underside of the hood, and on top of everything on the driver's side of the engine bay (like the fan had splattered it?). SO, I immediately thought thermostat but there is no sign of leakage at all around the the housing or either of the hoses coming off the housing. Didn't see any obvious leakage on the ground. Fuses are fine. Faulty thermostat? I don't think so, because the temp had previously been overheating/ fluctuating, and that whole ride the needle remained dead center of the gauge and didn't budge. WTF is wrong????