You have not bleed the air out of the system after you installed the t-stat, causing the heater not to work and the engine to overheat. Use a coolant filler that screws into the radiator and get the air out
My guess is the head gasket, have same problem. Nightmare
It could be the thermostat. Open up the radiator cap when it is hot and see if the water is flowing in the radiator. If it is not then it may be a thermostat.
probably need new head gasket
Heater core changed three years ago,I changed Thermostat Heater still blows cool air.
that's the complete oposite to mine! mine just keeps blowing hot air out! changed the thermostat and still nothing changed, in the end i just unhooked so it constantly blows cool air gonna be a problem in the summer!
you have an airlock
The thermostat may be stuck open.
control fuse blows when you plug thermostat to base controlling a gas pack unit
It can if it is stuck closed the engine overheats causing hot air ( steam ) to flow backwards to radiator cap which releases and blows steam pressure into recovery reservoir which starts blowing out the coolant in the reservoir making a puddle on ground.
you might want to check and see if the heater core is bypassed
That is normal, It is a thermostat
I have changed heater core and did no good same problem as before it blows only cold air I do not understand it