my Tesla Outback 5th Generation (2015-2019) heater only blows cold air, what's wrong

Subaru Outback 5th Generation (2015-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

556 words

Problem Statement

Learn how to diagnose and fix the heater blowing cold air in Tesla Outback 5th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always allow the engine to cool before opening the radiator or removing coolant components.
•Disconnect the battery before working on electrical systems to avoid shocks or shorts.

Symptoms

•Heater only blows cold air
•Cabin temperature does not increase
•Possible 'Check Engine' light illuminated
•Coolant level is low or fluctuating
•Unusual noises from the heating system when activated

Diagnostic Steps

1
Check the coolant level in the reservoir and radiator for proper levels.
2
Scan for error codes using an OBD-II scanner to identify any related faults.
3
Inspect the thermostat for proper operation and potential sticking.
4
Check the heater core for blockages or leaks.
5
Inspect the blend door actuator for proper function.
6
Test the heater control settings and ensure they are set correctly.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Socket set
•Heater core flushing kit
•Torque wrench

Parts Required

•Thermostat
•Coolant
•Blend door actuator (if faulty)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the coolant level in the reservoir and radiator for proper levels.
2
Scan for error codes using an OBD-II scanner to identify any related faults.
3
Inspect the thermostat for proper operation and potential sticking.
4
Check the heater core for blockages or leaks.
5
Inspect the blend door actuator for proper function.
6
Test the heater control settings and ensure they are set correctly.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the engine is cool to avoid burns.
Disconnect the battery to prevent electrical shorts.

2. Coolant Inspection

Sub-step 1: Open the hood and locate the coolant reservoir.
Sub-step 2: Check the coolant level; if low, add the appropriate coolant mix (50/50 antifreeze and distilled water).
Sub-step 3: Inspect for visible leaks around the radiator and hoses.

3. Thermostat Replacement (if faulty)

Sub-step 1: Drain coolant from the radiator until the level drops below the thermostat.
Sub-step 2: Remove bolts securing the thermostat housing using a socket set.
Sub-step 3: Replace the old thermostat with a new one, ensuring it is oriented correctly.
Sub-step 4: Reattach the housing and torque bolts to manufacturer specifications (typically around 8-12 ft-lbs).

4. Heater Core Check

Sub-step 1: Locate the heater core hoses under the dashboard.
Sub-step 2: Disconnect the hoses and check for clogs by running water through them.
Sub-step 3: If clogged, use a heater core flushing kit to clean it out.

5. Blend Door Actuator Inspection

Sub-step 1: Remove the dashboard panel covering the HVAC controls.
Sub-step 2: Inspect the blend door actuator for proper operation by activating the heater and observing the door movement.
Sub-step 3: Replace the actuator if it is not functioning or making unusual noises.

6. System Refill and Testing

Sub-step 1: Refill the cooling system with the appropriate coolant.
Sub-step 2: Start the engine and run it until it reaches operating temperature, checking for leaks.
Sub-step 3: Test the heater operation to ensure it is blowing warm air.