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1) Coolant tank may show full but radiator is low in coolant...Cold engine...remove cap...inspect coolant level in radiator...fill if necessary,,,
2) If #1 is OK, the coolant system has an air blockage...With cold engine remove cap...Start engine...Heat control on high... when thermostat opens coolant AND air will escape from radiator...there will be coolant loss...Wait until all air escapes then carefully replace cap...When engine cools remove cap and top off coolant if required.....saailer
Heat and air conditioning are in separate systems. If you aren't getting heat, the first step is to check your coolant level. Low coolant can result in improper flow through the heater core. If you do have low coolant, be on the lookout for a coolant leak! If your coolant isn't low, then there is going to be an issue with circulation through the heater core. The heater core could be clogged in some way or another.1
2004 kia sorento, thermostat replaced, all belts, water pump. now there is a coolant leak again, cannot tell where it is coming from. Leaks fairly quickly and overheats within 20 mins. Heat is not working when coolant is not full....could it be the coolant resevoir? head gasket??
If the rest of the system is working fine, and your coolant isn't leaking, then either the heater core or the water control valve is, more than likely, blocked up. Have a flush and fill performed on your cooling system. If that doesn't help, remove and inspect the heater core, it should flow water freely.
Check the heater hoses going into the firewall when hot they should both be warm one more so than the other. if they are cool you do not have coolant geting to the heater core thermostat is wrong or backwards. I asume you replaced the stat due to this problem so your hoses are probably hot. If there is a big differance the heater core may be plugged. flush it from the cooler of the two hoses with a garden hose out the side of the hotter hose. DO not do this while it is hot! If the hoses are close in temp you have a blend door control issue. It may be the actuator on the heater box or the controller on the dash. Good Luck