The "AC Off Due to High Engine Temp" message in a 2013 Chevy Malibu is often caused by a faulty coolant temperature sensor. This issue can be frustrating, but it's typically a straightforward fix. Let's explore the problem, its causes, and how to resolve it.

Understanding the Issue

When your 2013 Chevy Malibu displays the "AC Off Due to High Engine Temp" message, it's the vehicle's way of protecting the engine from potential damage. However, this warning doesn't always mean your engine is actually overheating. In many cases, it's a false alarm triggered by a malfunctioning sensor.

Common Symptoms

  • AC shutting off unexpectedly
  • Temperature gauge showing cold even when the engine is warm
  • Check engine light illuminating
  • Fans running after the car is turned off

Causes of the Problem

The most frequent cause of this issue is a faulty coolant temperature sensor. There are actually two temperature sensors in your Malibu:

1. One that reports to the engine management system

2. Another that feeds information to the temperature gauge

When either of these sensors fails, it can trigger the AC off warning and cause other symptoms.

How to Fix the Issue

Step 1: Diagnose the Problem

First, use an OBD-II scanner to check for error codes. Common codes related to this issue include:

  • P111E (Temperature Sensor)
  • P0119 (Engine Coolant Temperature Circuit)

Step 2: Replace the Faulty Sensor

To replace the coolant temperature sensor:

1. Locate the sensor on the water outlet valve

2. Disconnect the battery

3. Remove the electrical connection and retaining clip

4. Replace the old sensor with a new one

5. Reconnect everything and refill coolant if necessary

Important: Always allow the engine to cool completely before working on the cooling system.

Step 3: Clear Error Codes

After replacing the sensor, use an OBD-II scanner to clear any error codes.

Prevention and Maintenance

To avoid future issues:

  • Regularly check coolant levels
  • Flush the cooling system as recommended in your owner's manual
  • Address any cooling system leaks promptly

When to Seek Professional Help

If replacing the sensor doesn't solve the problem, or if you're uncomfortable performing the repair yourself, it's best to consult a professional mechanic. They can perform a more thorough diagnosis and address any underlying issues.

FAQs About AC Off Due to High Engine Temp in 2013 Chevy Malibu

    • Can I drive with the "AC Off Due to High Engine Temp" warning?
      It's best to address this issue promptly to avoid potential engine damage. If the actual temperature gauge isn't showing overheating, you can drive short distances, but get it checked as soon as possible.
    • How much does it cost to replace a coolant temperature sensor?
      The part itself is relatively inexpensive, usually around $20-$30. If you're having it professionally installed, labor costs can bring the total to about $100-$150.
    • Could this issue be related to a faulty thermostat?
      Yes, a stuck thermostat could potentially cause similar symptoms. However, the coolant temperature sensor is a more common culprit for this specific warning message.