My Car Heater is Blowing Cold Air and Overheating

Reason why my car heater is blowing cold air and overheating the engine. Here are a few things that you can check yourself that are likely the issue.

Your car may be old and it may be the POS that you call it everyday but you can smile a little because your car’s problem can be fixed right at home.

So why is my car blowing cold air and overheating the engine? The engine thermostat is first in line for reasons why this is happening.

The engine thermostat looks like a doorbell with a spring attached to the back of it. Your engine thermostat controls the flow of coolant in your car.

When the coolant in the radiator is cooled by the fan, the engine thermostat opens and allows the cold coolant to flow around the engine to cool it.

The hot coolant that already surrounds the engine is sent back to the radiator for cooling. This happens constantly until you turn the engine off.

Your car has a small version of the radiator called a heater core. The heater core is about the size of a phonebook and it mounts under the dashboard on the passenger’s side of the car.

While hot coolant flows around the engine, hoses divert some of the hot coolant to the heater core.

The hot coolant flows in one side of the heater core and out the other side headed back toward the engine.

The heat from the hot coolant is what your heater normally blows throughout the inside of the car.

If your car is blowing cold air that means that, the hot coolant is not reaching the heater core. This is likely the fault of your engine thermostat.

As they age like everything, they wear out. The engine thermostat remember, is supposed to open but old engine thermostats often get stuck.

When this happens no cold coolant reaches the engine and it starts to overheat quickly. Cooling system clogs also happen from a lack of maintenance.

Besides the bad engine thermostat, your heater core itself may be clogged with coolant sediment.

Replace the engine thermostat because it is overwhelmingly the likely problem. With a repair manual, you can replace the engine thermostat in less than an hour at home.

If you choose to take the car in for repair, you should first search local auto part stores websites to see if they have your engine thermostat in stock.

You should also check to see which store has the part at the lowest price.

Purchase the engine thermostat and take it to the repair shop to save some money on the repair if you are not repairing your car yourself.

If you discover that your heater core is clogged and you need a heater core replacement you could also replace it yourself.

Some repair shops charge a pretty penny for heater core replacement so again it would be wise to get the part yourself and research heater core replacement cost.

What ever you do, don’t wait around thinking that the issue will fix itself because either situation will just cause more problems.

If the engine thermostat is not working, you are risking severe damage to your engine that will cost more than a 20 buck part. A clogged heater core will eventually turn into a leaking heater core.

When the heater core starts leaking all of the coolant within it leaks inside of the car, a smell and mess you won’t forget.