Why is my car blowing out cold air when the heat is on?
by
Low Coolant Level
The coolant (usually a mixture of water and antifreeze) in your engine doesn’t just work to keep the engine from overheating: It’s also the source of heat supporting the heating system. If there isn’t enough coolant in your system, the heater core will blow cold air into your car.
Here are the most common reasons why your car heater isn’t blowing hot air. Low coolant: Whether caused by a leak or water evaporation, low coolant is the most common source of poor heater output. Thermostat: A stuck-open thermostat prevents the engine (and coolant) from heating up.
Two of the most common causes of electric furnace or heat pump failure are blown fuses and frequently tripping circuit breakers.
Where is the heater core located on a 2015 Nissan Rogue?
It’s mounted under the dashboard, and it provides the heat needed for the blower motor to warm the cabin.
Why is my car blowing out cold air when the heat is on? – Related Questions
What are two signs that the heater core has failed?
First, the heater core could be malfunctioning and, as such, the defrosters aren’t working. Second, the core could be blowing fog/smoke into your vehicle’s cabin. Both are bad signs and need to be checked into right away.
Why did my heat stop working in my Nissan Rogue?
The most common reasons a Nissan Rogue heater isn’t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
Where is the heater core location?
A heater core is a small radiator located under the dashboard of the vehicle, and it consists of conductive aluminium or brass tubing with cooling fins to increase surface area. Hot coolant passing through the heater core gives off heat before returning to the engine cooling circuit.
Where is the heating core located?
The heater core is located inside the vehicle between the instrument panel and the firewall. It looks like a miniature radiator minus the fill neck and cap. The purpose of the heater core is to provide heat for the passenger compartment.
Start your engine, allow it to warm up for a minute and turn the heater lever to full blast. If the system is ok, you should feel a blast of cool air. Now, turn the heater lever to full heat. If you feel warm or hot air flowing into the cabin, your heater core has no leaks.
What are the symptoms of a leaking heater core?
So it’s important to know the 5 signs to look for a leaky heater core.
Your Car Smells Sweet. You may notice a sweet smell from your vents.
Your car windows become foggy.
Your car is blowing cold air into the cabin.
Your car is devouring coolant.
Your car’s cabin is cold, but the engine is hot.
How do you know if your car heater core is clogged?
A noticeable difference in airflow could indicate that the heater core fins have been clogged and are restricting airflow.
Heater core failure symptoms
Weak or no airflow.
Cold air (not warm) coming through the vents when the heater is on.
Coolant leakage visible inside the cabin or a damp smell.
Can I unclog my heater core?
To clean the blockage, you need to flush water or air through the heater core. By doing so, the grime and dirt that’s causing the clog will come out through the inlet hose. Now, insert a water hose into the outlet hose. If you have access to an air compressor, you can use that to push out the coolant and grime.
The total cost of parts and labor will range between $800 and $1,000 to have your heater core fixed by a professional. Labor costs vary, so call ahead and get a quote from multiple repair shops.
What causes heater core to go out?
How does a heater core go bad? There are multiple reasons a car’s heater core could not be working properly. One reason could be due to clogging, as the coolant could become contaminated if it’s not regularly flushed out.Another reason for a bad heater core could be because of a leak somewhere in the system.
What happens if you drive with a broken heater core?
Driving with a faulty heater core can be risky, as it can lead to overheating and extensive engine damage. Even a clogged heater core can prevent proper coolant circulation, causing your engine to run hot. But if you must continue driving for a short distance, keep an eye on the temperature gauge.
What happens if your heater core is clogged?
As much as you can still drive with a clogged heater core, do not journey with it as it can cause the engine to overheat and damage engine components. A clogged heater core can reduce coolant circulation, which will cause the engine to run at a higher temperature.
How do you unclog a heater core in a car?
Can you replace a heater core yourself?
Heater core replacement is quite a task for a DIY mechanic, but you can do it with the right tools and enough time. Alternatively, it can be an expensive bill from your local mechanic, so it’s worth a shot to save hundreds of dollars if you have some wrenching skills.
How can you tell if a heater control valve is clogged?
Below are the signs of a bad heater control valve:
No heat coming out.
Heat always on and cannot be turned down.
Heat output changes with no changes in the heat setting.
Temperature gauge reads hot.
Low coolant level.
Coolant leak.
Can heater control valve cause no heat?
No warm air
If the heater control valve fails or gets stuck, it will not be able to allow hot coolant into the heater core so that the heater can operate. If the heater does not have hot coolant the AC system will not be able to blow hot air, and the front defroster may not work.