2007 Hyundai Veracruz 3.8L V6 heater is not warming up

Question

In 20 min after I start the engine temperature goes up to the maximum (red mark). But the air heater is not warming the air inside.

Answer 1

Your description sounds like there is no coolant in the cooling system, or the coolant is not circulating.

Start by inspecting the engine coolant level at the coolant reservoir (do not check the coolant level at the radiator). Top off the coolant if necessary.

If the coolant level was low, then check for coolant leaks. Check for damaged radiator or radiator hoses.