How to Fix Subaru Impreza Heater Not Working: Expert Tips and Advice

Check the blower fan, heater core, and any related fuses to see what might be causing the Subaru Impreza’s heater not to work.

Subaru Impreza Heater Not Working

If your Subaru Impreza’s heater is not working, you may be dealing with a complex problem that can require some time and effort to diagnose and fix. To start, check the thermostat. If it’s not working, the heater won’t be able to regulate heat properly. Other possible causes include clogged air filters, inadequate coolant levels, inoperative fan motors, or faulty hoses and pipes that may have become corroded or disconnected. In worst cases, you might need a new heater core if major components are defective. Remember to always refer to your owner’s manual for more specific instructions on maintenance and repair.

Symptom Replication and Diagnosis Procedures

When a Subaru Impreza heater is not working, the first step is to troubleshoot according to the user manual. This will help identify any potential issues that could be causing the problem. Additionally, it is important to analyze the code present in the Engine Control Module (ECM) as this can often provide clues as to the cause of the issue.

Examine Heater System Components

In order to determine if there are any issues with the heater system components, it is important to check both the fuse and relay for any signs of damage or wear. Additionally, inspecting both the water inlet valve and relief valve can provide insight into why these components may not be working properly.

Inspect Coolant Hoses & Gasket

The next step in diagnosing a malfunctioning heater on a Subaru Impreza is to confirm that all of the coolant hoses are in good condition and free from any visible signs of damage or wear. Additionally, it is essential to check that the gasket connecting these hoses is also intact with no visible signs of damage or corrosion.

Replace Heater Core & Motor Blower

If all other steps have been taken without success, then it may be necessary to replace both the heater core and motor blower on a Subaru Impreza. To do this, new replacement parts should be installed according to manufacturer guidelines before attempting to reattach and reconnect any components.

Environmental Issues with Malfunctioning Heaters

In some cases, environmental factors can cause a Subaru Impreza heater not working properly. It is therefore important to check for any potential heat blockages from items such as furniture or other objects inside of the vehicle’s interior. Additionally, verifying that there is sufficient coolant flow through water pipes should also be done as this can often be indicative of an issue with either a blocked flow or low levels of coolant within these pipes.

Inspect Thermostat Sensor & its Connectors

When troubleshooting an issue with your Subaru Impreza’s heater not working, it is important to inspect the thermostat sensor and its connectors. It is important to analyze the visual condition of plugs and connectors to ensure that the connections are secure and properly made. Additionally, you should inspect the performance of the thermostat sensor to make sure that it is functioning properly.

Clean Air Vents to Enhance Air Flow

Another measure that should be taken when troubleshooting your Subaru Impreza’s heater not working is to clean air vents in order to enhance air flow. This can be done by properly checking the flapping of vents while testing and cleaning the air passage carefully for blockages. This will help ensure that air is moving freely throughout the system, which can help resolve any issues with the heating system.

Assessing High End Systems for Job Completion

When dealing with a high end system such as a Subaru Impreza, it is important to assess all components of the system in order to complete any job correctly. This includes consulting a service manual for specific feature troubleshooting, as well as making adjustments or replacements of failed components if necessary.

Plug in Professional Diagnostic Equipment

Finally, it may be necessary to plug in professional diagnostic equipment when troubleshooting an issue with your Subaru Impreza’s heater not working. A fault code reader can be used in order to detect any potential problems with the system, while upgrading ECM software may also be necessary in order to resolve any issues.

FAQ & Answers

Q: How do I troubleshoot a Subaru Impreza Heater Not Working?
A: Troubleshooting a Subaru Impreza Heater Not Working involves analyzing codes present in the Engine Control Module (ECM), examining heater system components such as fuses and relays, inspecting coolant hoses and gaskets, replacing heater core and motor blower, assessing environmental issues with malfunctioning heaters, inspecting thermostat sensor and its connectors, cleaning air vents to enhance air flow, assessing high end systems for job completion and plugging in professional diagnostic equipment.

Q: What should I check for heat blockages from interior objects?
A: When assessing environmental issues with malfunctioning heaters, it is important to check for heat blockages from interior objects such as furniture or items that may be blocking the airflow. Such blockages can reduce the efficiency of the heater system.

Q: How do I inspect performance of thermostat sensor?
A: To inspect the performance of the thermostat sensor, it is important to analyze the visual condition of plugs and connectors that are connected to it. This will help determine if there are any visible signs of damage or wear that may be affecting its performance. It is also useful to examine if the connections are intact.

Q: How do I clean air passage carefully for blockages?
A: Cleaning air passages carefully for blockages will help improve airflow in the heater system. This can be done by using a vacuum cleaner or compressed air to remove dirt particles and debris from vents and other areas where air passes through. It is also important to ensure that flapping of vents is properly checked while testing.

Q: What should I do if professional diagnostic equipment cannot detect a problem?
A: If professional diagnostic equipment cannot detect a problem after being plugged in, it may be necessary to upgrade the ECM software as this can help resolve any underlying issues with the heater system. In some cases, adjustment or replacement of failed components may also need to be carried out in order to complete the job successfully.

In conclusion, there are multiple potential causes for a Subaru Impreza heater not working. The first step is to confirm that the heater system is properly functioning by testing the components such as the thermostat and blower motor. Once these components have been tested and confirmed to be working, other potential causes can be investigated such as an insufficient coolant level, a failing heater core, or an electrical issue.