Why is my Subaru heater not blowing hot air?

Possible Reasons for Subaru Heater Not Blowing Hot Air
There are several potential reasons why your Subaru’s heater may not be blowing hot air. Here are some common causes to consider:
Low Coolant Levels or Air Lock
– Low coolant levels may prevent the coolant from circulating through the heater matrix, leading to insufficient hot air. Additionally, an air lock in the system can also hinder proper circulation of the coolant.
Faulty Thermostat
– A jammed open thermostat can cause the car to overcool, resulting in insufficient temperature in the coolant to provide hot air. Testing or replacing the thermostat may be necessary if this is suspected to be the cause.
Clogged Heater Core
– A clogged heater core can prevent hot coolant from reaching the cabin, resulting in the heater not blowing hot air. Signs of a faulty heater core may include a sweet-smelling scent in the car, fogged-up windows, and puddles under the dashboard or on the passenger-side floorboard .
Faulty Blower Fan or Blower Motor Resistor
– If the blower fan or blower motor resistor is faulty, it can lead to issues with setting the fan speed or getting air at all.
Other Factors
– Other factors such as a malfunctioning thermostat, inoperative blower fan, or issues with the heater core’s maze-like network of tubes being clogged or leaking can also contribute to the heater not blowing hot air.
Possible Solutions
If you suspect any of the aforementioned issues, it may be beneficial to consider the following potential solutions:
– Complete flush and fill of the coolant using Subaru OEM Blue long life coolant.
– Checking and, if necessary, replacing the thermostat.
– Flushing the system with a hose or by other appropriate means to address blockages in the heater matrix.
– Checking the blower motor and blower motor resistor for any faults.
It’s important to note that these are general suggestions, and it’s advisable to consult with a qualified mechanic or Subaru service professional to diagnose and address the specific issue with your Subaru’s heater.

Why is my car blowing out cold air when the heater is on?

When the thermostat can’t signal that the engine is warm, the coolant won’t be sent over to provide heat to the heater core and the air will blow cold. Solution: You need to install a new thermostat to get your heater working again. It’s a relatively quick and easy fix.

Why is my Subaru Outback not blowing hot air?

The most common reasons a Subaru Outback heater isn’t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

What do I do if my heater is blowing cold air?

The Furnace Is Blowing Cold Air: A Troubleshooting Guide

1. Check the Thermostat Fan Setting.
2. Thermostat Not Working.
3. Check Furnace Air Filter.
4. Broken Furnace Control Panel.
5. Pilot Light Is Out.
6. Standing Water Around Unit.
7. Leaking Ducts.
8. For Furnace Repair in Cincinnati, Turn to Apollo Home.

Why is cold air coming through the heater vents?

The heat exchanger uses coils to transfer heat from the ignited gas to the air. When cold air blows from a furnace the heat exchanger, furnace burner, or exhaust are likely the cause. This may be due to dirty components, broken parts, or the many safety mechanisms within the gas system.

Why is my heater blowing cold air but not hot?

If your furnace is blowing cold air in your home, this is a sign of an issue with the flame detector, gas supply, air filter, pilot light, or condensate lines. Many of these issues are able to be easily solved on your own by sanitizing or replacing components in the gas furnace.

What are the symptoms of a bad thermostat?

Watch for These 9 Signs of a Thermostat Going Bad

• The screen is dead.
• The actual temperature doesn’t match the display.
• Your AC or heater is stuck on.
• Your heating and cooling won’t turn on.
• Your HVAC is short cycling.
• Scheduled settings stop working.
• Nothing happens when you adjust the settings.
• Temperatures shift.

How do I know if my heater core is clogged?

In some instances the heat in your car may work just fine during mild cold spells. But fail when the cold gets really bad this. Situation is suggestive of a heater core that is partially clogged.

What are the symptoms of a clogged heater core?

In some instances the heat in your car may work just fine during mild cold spells. But fail when the cold gets really bad this. Situation is suggestive of a heater core that is partially clogged.

Why is my car heater only blowing lukewarm air?

Your thermostat may be stuck, which can prevent the heater system from warming up sufficiently. If your heater is blowing lukewarm air rather than cold air, this may be the culprit. Air bubbles may be trapped inside of the cooling system, which can cause malfunction. This air must be flushed out by a professional.

Why is my car not blowing hot air on heat?

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. Heater core: A clogged heater core restricts coolant flow, giving up little or no heat.