Most cars work with a coolant heater. That means the faster you go, the more RPMs your car goes through, and the more coolant will circulate – allowing for a better functioning heater. In most situations, that is normal behavior.
There are two possible scenarios here: first, your car heater works better when you’re driving; second, your heater starts to fail when you release the gas pedal.
The first scenario is completely normal. Your car heater should work even when you’re parked, and, at the same time, it should work even better when you’re driving around.
The second scenario is something else entirely.
As I have told you, your car heater depends on the water-cooled engine working.
So, if your car has a hard time moving the coolant around (for the heater to work), it may have something clogged. It could be anything from the cooling system connecting everything together to the water pump doing the work.
Unfortunately, you’ll have to roll up your sleeves and get to work to find out what is clogged.
The good news is you’re supposed to flush and clean everything in there every once in a while – so you’ll quickly cross that out of your car maintenance list!
Why does my car heater blow cold air?
Car heaters tend to blow nothing but cold air because of three issues: a faulty heater core, a malfunctioning cooling system, or a stuck thermostat. Any of them could be the culprit, and you’ll need to check each one to see what’s truly going on.
Faulty heater core:
The easiest one to check out of all three. A faulty heater core often causes mist to appear inside your car alongside a fruity smell. A more serious issue with the heater core could lead your car to waste coolant and leave you with an overheated engine.
Malfunctioning cooling system:
The recurring culprit in heater issues is the cooling system. And it should come as no surprise – because the cooling system is the most important thing that keeps your heater working. As you know, you have to check the water pump, radiator, and hoses. If there’s any damage or loose ends, there’s the reason why you have cold air coming out of your heater. A mechanic may be able to help if you can’t tell what’s going on.
Why does my car get cold when I slow down?
If you have a hard time with your car heater every time you slow down, you may have a radiator problem or a worn-out water pump.
As I briefly explained above, you can only check if you have a water pump issue if you see it for yourself. It could be worn out, loose, or broken. There’s no need to be a mechanic to realize what’s going on here – you’ll notice the minute you see it.
Radiator issues are trickier. In this case, you need to be a mechanic to know what’s going on. You can also get one to tell you what’s wrong. In that case, if you need to replace the radiator, you can get a professional to do it.
Some people would tell you to check the thermostat. I wouldn’t pay it too much attention as long as your heater works when you press the gas.
Why do I think this way? Because stuck thermostats will give you trouble all the time, not only when you’re accelerating. It’d be another issue entirely if, for example, your heater would be giving you nothing but cold air.
If your heater is losing power when you’re slowing down, there’s a big change your thermostat is okay (and that’s good!)
Why does my car heater stop working when I stop the car?
You may have a problem with the heater valve or a coolant issue if your heater stops working after you park the car. Remember that it’s normal for your car heater to work a little less when you are not driving – but it shouldn’t stop working when you park.
So, you’re driving around, the car keeps you warm, and the minute you park, things go below freezing. What’s going on?
First, make sure the car heater is not losing power as you slow down. You can check out what could be the issue right above this section.
If that’s not the problem, check the coolant levels, then check the water pump.
Your heater may be losing strength because of a loose water pump that has enough kick to work at high RPMs – but not enough when you stop the car.
Other than that, you could have a clogged heater core. The best part about this problem is that you don’t have to replace anything – you just flush the thing. Of course, you have to see if it’s clogged before you do.
Why does my car heater take so long to warm up?
Most cars take a little while to warm up and get the heater going. It’s perfectly normal for a heater to take a couple of minutes before getting to work. When temperatures are significantly low, you may have to wait for a little longer.
With that being said, there’s something like your car heater taking too long to work.
Make sure you’re not in a rush because the temperatures are below freezing and it’s early in the morning, though.
If that’s not the case, you need to check the coolant levels, heater valve, and cooling system.
It’s hard to pinpoint the exact problem without making a thorough inspection. Fortunately for you, a mechanic can figure out what’s wrong in a minute – and fix it right after!
I’d recommend dealing with the coolant levels on your own and seeking professional help if that doesn’t fix the issue.