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Normal if your heat is blowing cold air could be several things.However to keep it simple having your cooling system flushed and replace your thermostat and if your radiator hoses are more than 4 years old replace them.If after doing this and the problem persist it could be a blocked up heater core or maybe your waterpump is not circulating the water properly as secondary things to consider.Generally the thermostat is key component that fails and will not alloy the water to circulate thru the engine block and not get hot as it is designed to do.These are the simple things and if your cooling system has not been flushed every 3 years or 30k it is a general recommend.
Depending on your vehicle, the temp blend door actuator could also be faulty.
With the vehicle thoroughly warmed up and running, open the hood and locate both heater hoses (one is a feed and the other is a return). Using your hand, feel each heater hose. If one hose is hot and the other is warm or cold, you have a plugged heater core. If both hoses are only warm or cold, you have a faulty thermostat or your low on coolant. If both hoses are hot, you have a faulty temp blend door actuator.
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you are low on coolingliquid !
