running without a thermostat is going to increase the wear on your engine. Need more info to effectively troubleshoot

does it over heat?

how long does it take to over heat?

does it happen when your at stop lights?

does the coolant bubble in the resivor?

 

the thermostat was sticking shut i took it out and it runs perfectly fine til i can get a new one.
and im pretty sure it was coming out of the coolant tank so its all good now.
how can running w/out t stat hurt motor???

 

because it takes way too long for it to come up to proper operating temp. lubrication will suffer due to lack of heat in the block for a much longer duration.