Your radiator might have a small pinhole in it, causing it to not build up pressure.
Waterpump, thermostat, radiator, radiator hoses.
check or replace thermostat
check thermostat, first, then look for radiator leaks, hoses that might be leaking.
Dirty or plugged radiator Water pump Defective radiator cap Thermostat Cooling fan not operating hoses collapsing
First, I would change the thermostat, easy on these models. Then check it from there. It could also be the water pump, not circulating enough. Could also be a blockage in the hoses or the rad. But, go with the thermostat first.
Yes or possibly a stuck thermostat. this is most likely a stuck thermostat. Heater uses water coming through hoses to heat the air. If the thermostat is stuck, the water in the hoses does not get hot. it also explains why you're overheating. be sure to top off coolant after you fix the problem.
Probably the thermostat is sticking.
Purg The Air Out of the Cooling system
Check the coolant level, the cooling system hoses and the radiator, if it's fine you need to check the thermostat.
your engine is overheating, change your thermostat first, if that doesn't fix the problem check the rest of your coolant system (hoses, lines, core, radiator,ext.)
Did you put the thermostat in backwards? I would check to see where the steam is coming from. I had to change out small hoses for the same problem with mine.
Plugged radiator, Bad thermostat, water pump not working, radiator hoses collapsing and dont forget no oil