The video below, in the Related links section, shows step-by-step how to replace a thermostat.
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If you do not have any external leaks, a head gasket is most likely.
im having the same problem with my 1994 I've replaced the heater core,thermostat,radiator,i checked the coolant, and it's not over heating or nothing and still no heat lol
Are you sure it isn't the hose leaking AT the thermostat housing? If the car ever overheated on you, there may be a warped head. If so, you're in a BIT of trouble. Let a mechanic look at it. A consultation should cost you little or nothing.
If you are talking about the thermostat in your engine, the two have nothing to do with eachother. If there is no air at all coming out the vents, I suggest it is your blower motor.
Had this happen once. Found out the thermostat was'nt opening. Replaced it and everything worked fine. Watch your heat gauge, if after a few minutes of the engine running and the gauge goes from nothing to hot imediatly instead of gradully, you;ve probably got a bad thermostat.
Thermostat
no, the thermostat would have nothing to do with the car not starting.
it can..rain has NOTHING to do with your radiator or the thermostat
check your fan clutch if its weak it will overheat
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