The first thing is to check the coolant level, make sure engine is cold beefore removing the radiator cap, then start car with cap off and add as much as needed, this problem is not a bad thermostant, a bad thermostant would overhaet but would give heat, even if it was stuck open the heat would take while to get hot but then car wouldnt overheat, this problem one one of these problems, . low coolant or a bad waterpump, i have seen a few like this and the waterpump propeller rots away and coolant cant circulate, the last thought would be a bad head gasket but you would get heat when driving, so if coolant isnt low then waterpump is bad. hope this is helpful.
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Have the coolant checked;if ok i would have the thermostat checked and replaced.
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Regards, Lee Davidian
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