I had heat before i change the thermostat what happened?

u hav enough fluid--also there mite b air in the system--water pumps cant circulate that--may be coming from a worn engine--is the blower motor wirkin or the vents

iT IS EASY TO MISTAKENLY TURN THE THERMOSTAT UPSIDE DOWN TRY THAT IT HAPPENS.

if a car misfires its going to create heat , check your us army e-mail

Could be a number of issues:
Low Engine Coolant
Thermostat,
HVAC controls,
or Heatercore.

Check in this order:
Make sure your engine coolant is not low!

Does your engine heat up to the proper temperature? If not, change the thermostat.

To check heatercore try this:
Keep your air turned off, after the car's engine is heated up nicely, turn the heat on and see if you get some heat for a short while. If this happens, your heater core is plugged.

Hopefully one of these help fix the problem for you as diagnosing the controls is harder.

that's like the thermostat not working properly... open the thermostat and see the different. if change positively, change the thermostat.

cambia el bulbo de la temperatura del radiador no el termostato

change your thermostat you probably have a old one.

1. (This is for a 2.2L engine) If equipped with an automatic transmission, remove the exhaust manifold.
2. Drain the cooling system.
3. Remove the thermostat housing to water pump feed pipe bolts.
4. Remove the thermostat housing to water pump feed pipe.
5. Remove the thermostat.

It is likely that the thermostat has failed and is stuck wide open as a failsafe. This jsut happened to me last week in my VW golf. Your engine will never come up to temperature but as long as the thermostat stays open it will not overheat either. Change the thermostat ASAP in case it the failsafe doesn't keep open and you overheat the engine.

Most likely a sticky thermostat, what is happening is that it's staying closed most of the time causing the engine to over heat, eventually it will open allowing the fluid to circulate and cool down from the radiator. I suggest changing the thermostat rather quickly or you could do damage.
There are two hoses coming from the radiator, the thermostat is located on the top hose where it seats on the motor. Usually fairly easy to change only a few bolts, but you will have to drain most of the fluid from the radiator. I also recommend getting some 'indian head' gasket sealer and apply to the motor side of the gasket, not the side that seats onto the thermostat.