so i work at an autoparts store and i seel thermostats like crazy right now but i wanna know what is the purpose of this part at the bottom of the thermostat

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Inside the thermo is a chamber filled w/ a wax. Its on the opposite side of the spring. When the engine gets warm the wax melts, becoming a liquid. Since liquid does not compress the wax pushes against the little rod on the one end (its connected to the other side) which pushes the side with the spring open and the thermo allows coolant to pass thru. When the engine gets cold the wax becomes hard again and the thermo closes back up. The spring is there to pull the thermo closed. Without it the thermo would hang open.

Stick a thermo in a boiling pot of water with a thermomoeter and at about 180 degrees it should start to open. Made for a nice science project.

 

ya i know that much but like the thermo for my 67 doesn't have that extra disk and spring on the bottom on the bottom that what i wanna know about

 

Dont know about that one, must bethe manufacturer. Most pill box thermos dont have a spring like that.

 

Newer thermostats are built more robust. Longer piston assembly allows for more spring and wax to be added. This increases reliability and efficiency in cooling systems since the thermostat has more torque to close the thermostat when it needs to be closed. Older design thermostats can let water seep around their "sealed" piston assembly because the water pressure is so strong it keeps it cracked.

 

so if i got a newer thermo that fit my engine wit the same temp you are saying that it would be more cosistent with the temps basically and it seals better