How to Fix a Car With No Heat Easy
How to Easily Fix a Car with No Heat
In a warmer state, a busted heater isn't that big a deal. Put on a sweater and you'll be fine. But in colder states, it's a serious problem, and you want to fix it pronto. We've got good news and better news: ChrisFix has a solution, and it's really easy.
How do you fix a car with no heat the easy way?
It's probably the coolant. But just in case it's not, let's cover the troubleshooting checklist:
- Coolant
- Water pump or thermostat
- Blower motor or control module
- Heater core, hoses and valves
- Blend door actuator
More often than not, it's going to be the coolant. But sometimes it's something else, so we might as well run down each one of these potential issues and get into how we're going to fix them. Watch the video and read on.
How to Fix a Car with no Heat (The Easy Way)
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Coolant
The way your heater works is it's basically giving you the hot air that comes from your engine heating up. So, a working coolant system is necessary for getting hot air in the cabin. So, step one: Check your coolant. Your owner's manual should tell you how.
You want to see if it's low or if it needs to be replaced.
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Water Pump or Thermostat
With any luck, the coolant did the trick. If not, it's time to check the water pump. If you have a broken water pump, your car's going to be overheating instead of giving that hot air to you. Check your temperature gauge for overheating.
If your temperature gauge isn't getting up to operating temperature, you might have a bad thermostat. Open the hood, follow the top radiator hose into the engine, and you'll find the thermostat held in place by two bolts. Swap it out with a new one.
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Blower Motor or Control Module
If your fan only works on high, it's probably the control module. If your fan isn't blowing at any speed, it's probably the motor.
Good news: ChrisFix has videos on both of those issues. Click here for the module or here for the motor.
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Heater Core, Hoses and Valves
If the fan is working but the air is only a little warm, it's probably a clog in the heater core. You'll find your heater core hoses under the hood on the passenger side or near the middle.
Both hoses should be hot. If one's hot and one isn't, you may have a bad valve. Turn the heat on and back off to see if the valve moves. If not, you can replace it, or just rubber band the valve open as a temporary fix.
Your valve may be operated by a cable, which can simply pop out of place. You can just reattach that and you'll be fine.
If your valve is working fine, you may need to clear a clogged hose or core. You can flush the core with a garden hose at low pressure.
If both lines are cold and the valve is working, it's probably air stuck in the system. You can bleed your cooling system, or you might even be able to fix it by running the heat and revving the engine a few times.
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Blend Door Actuator
Right under the dash is a little door that allows cool or hot air into the car depending on how it's set. It may have popped loose or otherwise be broken.
Turn the temperature all the way up and down quickly. If you hear a knocking sound at each extreme, that's the blend door popping shut. A gear-stripping clicking noise could also point to a broken actuator.
You might find behind the controls that you have a loose connector or hose, and then all you have to do is reattach that.
This isn't going to cover every problem you could possibly have with your heater, but it covers the big ones. Chances are you're going to find that your heating, ventilation and air conditioning issue is one that ChrisFix has covered. If not, you may require more thorough diagnostics.
"HVAC Works Great!"
Check your local classified ads and you're going to see a lot of junkers boasting, "HVAC works great!" That's because it's one of the easiest things to fix. The rest of the car, maybe not so much. So, read the Vehicle History before you buy.
Gilbert Smith
Gilbert Smith is a New Mexico-based automotive journalist who enjoys writing about cars, trucks, and SUVs. He is a longtime contributor to Vehicle History and a member of the site's original content team when it launched.
Source: https://www.vehiclehistory.com/articles/how-to-easily-fix-a-car-with-no-heat
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