No heaty
2 Answers
No heat as in heater for car or no temperature reading heat. Either way, make sure your water system is full and thermostat is working properly. Make sure your getting hot water to heater core by touching hoses going to Heater core. You may also have to bleed your water system. Good luck.
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Coolant loss resulted in a bubble of air at the highest point in the cooling system which is usually the heater core. The heater core will not produce heat from just air and it must have hot coolant flowing through it. You need to investigate the cause of the coolant loss. It could be a leaky hose, leaky water pump, bad thermostat, leaky radiator, bad head gasket or something else.