The heater in my car won't give any hot air, only cold. What could be wrong, and how can I fix it?
by 
bj hall
ANSWERS: 7
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It could be a number of reasons. It's possible that you do not have the proper amount of coolant/water in your cooling system. It's also possible that your heater core could be damaged/broken. Without knowing anything else, it'd be difficult to say for sure what the problem is. Either way, I'd recommend that you take the vehicle in to a mechanic. A broken heater core could lead to coolant leaking into the car's interior.
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One of the most common and easiest remedies is the thermostat. It's a $3 piece that controls the temperature. If it is stuck in the "open" position, it will not maintain the engine/heater's proper temp. If the thermostat is stuck in the "closed" position, it will prevent the water pump from circulating the coolant through the engine, and can easily overheat. The thermostat is basically a valve that controls how much water/coolant circulates through the engine to maintain the proper temp. It is very easy for this small piece to get stuck. It should be replaced regularly.
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It is possible that your coolant/water ratio is off. Too much coolant will cause the heater to put out cool air.
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There are many different problems that will cause a no heat concern. The coolant level may be too low, the heater core could be clogged, there could be a heater by-pass valve not opening, the doors in your hvac system may not be moving- allowing only what should be a/c into the pass. compartment, and a stuck- open thermostat will cause a temporary lack of heat- eventually the engine will warm up enough for heat, about 20 min. depending on the vehicle.
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how about if the head was bad or the block is pluged up the port holes in the head
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1st and formost make sure the coolant level is full, 2nd if the water temp runs @ 195 to 225 degrees you can pretty much rule out the thermostat. if temp is lower than 195 possibly T-Stat is stuck open.3rd check heater hoses going in and out of the heater core, if one is hot & the other cool, you have a restriction of flow through the heater core,(ie.)a bad heater control valve, or a clogged heater core,and lastly,if all the above check out, you have a cable or actuator not opening the appropriate door to let heat in the HVAC system.
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It is also possible that you have an air bubble in your coolant lines. Over the past 2 years that same thing has happened to me so I took my vehicle repeatedly to the dealership where the car was purchased and they repeatedly told me they fixed the problem by replacing everything everyone else here has previously described. Yesterday I took my car to an independent auto repairman and he told me the Chrysler vehicles are one of the most popular types of vehicles that get an air bubble in the coolant lines. The repairman stated if you take your vehicle and park it on a steep uphill incline and run the vehicle with the heat on for awhile it should clear this issue.
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