I show how to change thermostat on punto
i change only gasket (is a leak)
Drain paraflu/antifrize by opening the lower tube
After open 2 bolts of thermostat 10mm and clamp
I use old thermostat
Cleaning..
Cut new gasket
new original gasket in israel cost too much 25$ 
Grease silicone to two sides of the gasket and close 2 bolt of thermostat on COLD car and clamp!!
After i wait 12 hours and fill coolant
