Cars & Vehicles Auto Parts & Maintenance & Repairs

My Car Heater Is Blowing Out Cold Air - Why?

Our car heaters are just one of those things we just can't live without.
The squeaky car door and the wheel trims that are missing can always wait but getting in to a freezing cold car in the morning and then have to stay sitting in it is torture.
Your car heaters are located behind the dashboard and are connected to the coolant engine pipes, this is how the heater get heat, once your engine warms up the water circulates around the system and through the heater matrix.
A thermostat is what controls the water temperature.
It's shut until the water reaches a certain temperature so that the engine can warm up,this is so the oil is at its operating temperature and then opens to let the water circulate.
If you're not getting any heat from your heaters then your problem could be the thermostat.
If you don't run anti freeze in your coolant, then over time your water will clog up and this is what blocks the thermostat, preventing it from opening.
Luckily thermostats are very cheap to buy from your auto shop and straight forward to replace.
The way you can check to see if your thermostat is operating correctly, is by letting your engine run for about 10 minutes and then checking your temperature gauge inside the car, if it hasn't moved then your thermostat is to blame for your heaters not blowing out heat.
Some newer cars, internal gauge do not run by the thermostat so don't worry if the gauge has moved, it could still be just the thermostat.
Another thing to do, is to check that your engine water coolant in it.
If your header tank is empty then you won't get any heat if there's no water to circulate through the system.
Water is vital to your engine so if you haven't got any water coolant in your engine get some in there now.
If you have topped your water back up and your heaters have started working, it doesn't mean everything's fine, you have to check to see if you have any leaks in your coolant system.
Check for puddles under the car or steam coming from the engine, hoses or radiator, because no sooner you put water in it will come straight back out again and could cause some more damage.
These are just a couple of tips you can take to get your heaters working again.
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