Why is my car blowing 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.
A faulty or broken thermostat is the most common cause of your car’s failing heat. Stuck open or stuck closed, the part can not only cause issues with your heat but also your engine’s cooling system. One becomes an issue of comfort, the other becomes an issue of “Oh no, I’ve borked my engine.”
Will a blown fuse cause my heater not to work?
Two of the most common causes of electric furnace or heat pump failure are blown fuses and frequently tripping circuit breakers.
Why is my car blowing cold air when the heat is on? – Related Questions
How can you tell if a heat fuse is blown?
How do you reset a heater?
How to Reset an Electric Furnace
First, turn off the power supply to the furnace by turning off the breaker in the circuit box.
Locate the reset button on the furnace and press it to reset the furnace.
If the button is popped up, press it down.
Return the cover to the blower compartment and turn the power on.
Why is no heat coming out of my heater?
When you turn the furnace on but no heat comes out, there may be an obstruction. Dirty air filters restrict airflow, which can make it feel like not much heated air is coming out of your vents. Check the furnace filter and replace it if its surface is covered with contaminants.
What would cause electric heat not to work?
The most common issues include a faulty thermostat but these issues could also be a sign of a clogged filter, dirty air ducts, or a serious problem with your furnace.
What can cause an electric heater to stop working?
CAUSE: The most common cause for electric heater not working is blown fuses. SOLUTION: To check this, first unplug the device and check the fuse box of the house for blown fuses as well as tripped circuit breakers.
Where is the fuse for the heater?
If your furnace has a fuse, it will probably be located in the control box with the blower. BIf you can’t locate it, the transformer may have burned up and will need to be replaced. Once you’ve located the fuse, check its wires to see if they’re broken or look for signs of discoloration or cloudiness.
How do I fix my heat not working?
What to Check First If Your Heater Isn’t Working
Check the Furnace Power Switch. Some furnaces have an on/off switch that is frustratingly easy to switch off by mistake.
Look at Your Fuse Box That Powers Your Heater.
Check the Batteries in Your Thermostat.
Replace the Air Filters.
Notice Any Odors.
Heater Isn’t Working?
What to check if heat is not working?
Check your power source—a tripped circuit breaker or blown fuse could be the reason for your furnace failure. Reset your breaker or replace the fuse to see if that restores heat. Check your filter—if it’s so dirty that your system is struggling to move air through it, your furnace could overheat and shut down.
How do you diagnose a heater problem?
Use these steps to troubleshoot your car heater.
Check the Coolant. Low coolant can’t reach the heater core and generate warm air.
Assess the Heater Core. Make sure heater hoses are in good shape.
Based on whether you fix the car heater core yourself or with the help of a professional, the cost to fix it varies. Suppose you fix it by hiring a professional, the total cost range between $800 and $1,000. For fixing the issue by yourself, the cost ranges from $100 to $300.
How do I know if my 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.
How do I unblock 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.
How expensive is it to replace a heater core?
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.
How do you unclog a heater core in a car?
Will a radiator flush clean the heater core?
After they will drain the system once more. Then they will wash out the area near the water pump, where there are a lot of little seals that, if cracked, can cause leaks and add even more debris to your cooling system. After another drain, your mechanic will wash out the heater core.
Is it easy to fix a heater core?
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.