I never paid attention to the 80 deg C thermostat when I installed in May along with the aluminum thermostat housing the the SS impeller water pump. It has been giving me coolant message recently. I forgot I did the thermostat and bought one 88 deg C. Today I took it out because it was leaking, actually the car was overheating. The water pump o-ring was intact. So was the irregularly shaped red rubber ring. But the thermostat o-ring was very deformed, also with some crust. I also found the thermostat doesn't have a bleed hole. Those on my SAAB's all have one. While I don't believe in tampering with original equipment, what is the Board's recommendation on the bleed hole?