Hello Chris,
Unfortunately, I don't have any specific links, but I will post a pic of one of my spare themostats that features a bleed notch. The advantages over a thermostat that features a jiggle pin are that there is less coolant passing the thermostat prior to opening, so warm up time is quicker. Jiggle pins do fail and end up floating around within the cooling system, which also extends warm up time as there is now an uninterrupted flow of coolant passing the closed stat thus extending the warm up time. I also feel that (and this is based on 26 years of driving my Rover) coolant temperature regulation is improved by this later design. From the manufacturing point of view, a cost saving no doubt as well.
Ron.
Update,..here are the pics as promised.
The bleed notch is visible at 12 o'clock, and the thermostat is fitted this way.
The bleed notch can just be seen at the top of the thermostat.
Ron.
Unfortunately, I don't have any specific links, but I will post a pic of one of my spare themostats that features a bleed notch. The advantages over a thermostat that features a jiggle pin are that there is less coolant passing the thermostat prior to opening, so warm up time is quicker. Jiggle pins do fail and end up floating around within the cooling system, which also extends warm up time as there is now an uninterrupted flow of coolant passing the closed stat thus extending the warm up time. I also feel that (and this is based on 26 years of driving my Rover) coolant temperature regulation is improved by this later design. From the manufacturing point of view, a cost saving no doubt as well.
Ron.
Update,..here are the pics as promised.
The bleed notch is visible at 12 o'clock, and the thermostat is fitted this way.
The bleed notch can just be seen at the top of the thermostat.
Ron.