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Generally, no. The heater core usually has a direct line from the water pump, if the coolant was so low as to not circulate through the heater core your engine would overheat. Most likely a clogged heater core. Rust and sediment build up in the coolant system over time and cam clog the narrow channels in a heater core, which looks like a smaller version of your radiator. A reverse flush can sometimes clear the core out, but a severe case may require replacement. Any auto parts store can sell you a flush kit for about $10. I've used the prestone one with no problems, since the core may be really clogged, get the system cleaner bottle as well to ensure you get the most crud out possible. Follow all the directions on the kit, and cleaner, make sure you are using compatible antifreeze when you refill. DO not open any part of the cooling system with a hot engine (more than warm to the touch). Doing that can cause severe burns, blindness, or worse if the antifreeze in the engine starts to boil off violently.
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Why would cold air blow out when you turn on the heater?
engine not warm, low coolant, or stuck thermostat
Why does my 99 ford explorer gives off no heat it will blow heat then it would get cold?
Sounds like it is low on coolant.
Why would a thermostat run hot and the car heater blow cold air?
Insufficient amount of coolant or thermostat not opening
In a 1998 Durango what would cause the heater fan to not blow air when it is cold outside in the morning but work fine when it is warm outside in the afternoon?
Test the coolant freeze point to be sure the coolant is not freezing up when it is cold outside.
Why does my 2001 dodge air conditioning not blow cold?
if its blowing, but not blowing cold its low on coolant. it takes r134a.
Why would a 1998 Laguna blow only cold air?
low on coolant, dash control, blend door actuator are places to start
What would make my 2005 f350 diesel blow cold air out of the defroster when the settings are set on hot but when I accelerate hard it blows warm air?
Check your antifreeze or cooling level this happened to me.
Why does my frontera blow out cold air but not hot?
You have run out of coolant, or the heater matrix is blocked.
What would cause a 1984 Porsche 944 to blow hot air when the ACFan is not on but will blow cold when the AC is on?
The heater bypass valve is not fully closing, or leaking hot coolant into the heat exchanger.
Why would heat blow out on a 2006 KIA OPTIMA when driving at a fast speed and when you slow down cold air comes out?
Because you are low on Coolant
What causes a night heater to blow cold air?
Low coolant, bad coolant, blockage in the coolant line, bad heater core or element, bad thermostat
Why would a Mercedes 190e 2.6 heater blow cold air for 10 minutes and then get finally blow hot air and make gurgling sounds?
Sounds like low coolant or air in the cooling system
