Car AC Off Due To High Engine Temperature (FIX)

Car AC Off Due To High Engine Temperature (FIX)

Have you ever seen the “AC Off Due To High Engine Temperature” sign on your dashboard and would like to know what it means and what to do to fix this issue? If this is you, then this guide is for you.

This article talks about what that sign means, the causes, how to fix the issue, and how to prevent it from happening again. Without any further ado, let’s get right to it.

NEW: Is It Safe To Drive With A Broken Brake Line?

What Does ‘’AC Off Due To High Engine Temp’’ Mean?

AC due to high engine temp shows on your dashboard when the PCM (engine computer) senses extreme heat or an inoperative electric cooling fan.

Simply put, your car engine is hot or overheated, and to avoid more heat, that can cause damage, the AC turns off.

One of a vehicle’s safety features is the engine control unit (ECU). The ECU has a system that regulates and pilots all engine activities by collecting data from sensors in the car.

This signal is then transferred to the ECU for processing, and the signal makes actuators such as ignition angle, automatic throttle, and fuel regulation work.

When the ECU senses the temperature in the engine is very high, automatic regulation of the air conditioner system is done.

driving car
Photo by Oleksandr Pidvalnyi

What Causes A Car To Display “AC Off Due To High Engine Temperature”?

Here are some things that can cause this issue:

1. Leak or Drop In Coolant levels

Coolant is pumped when a car engine emits heat and this coolant regulates the engine. The resulting hot water is cooled by the fan, moved to the tank, and redistributed back to the engine.

If any issues arise from the coolant like blockages, leaks, or the coolant level drops than normal, a disruption of the cooling process will occur, and the AC will be turned off as a result. 

2. Bad AC Compressor

An AC compressor transforms refrigerant gas into liquid as it goes through the condenser.

If the AC compressor is faulty, cold air will not be sent into the car and no refrigerant will flow in the air conditioning system. When this happens, the car engine temperature will be unstable and the AC will go off.

3. Faulty Cooling Fan

The cooling fan is very important in the cooling system as it is responsible for taking away excess heat absorbed from the engine using coolant.

 It absorbs the heat and moves into the radiator where the heat is blown away. If the cooling fan is faulty, excess heat will not be blown away thereby causing the engine to overheat.

4. Faulty Thermostat Valve

In a car’s cooling system, the thermostat synchronizes the cooling fluid. The valve lets the fluid goes to the engine part if the engine temperature reaches a certain point.

If the thermostat is obstructed or faulty in any way, the coolant will not get to the engine to regulate it, thereby causing the engine to overheat.

5. Engine Coolant Temperature Sensor Error

The coolant temperature sensor(ECT) measures and regulates the coolant mixture’s temperature and sends a signal to the ECU.

The ECU can modify the necessary components to keep the engine running at the correct temperature. If this sensor should malfunction, the cooling fan will operate inaccurately, making the engine overheat as a result. 

Some other things that can cause the “AC Off Due To High Engine Temperature” to appear on your dashboard include a damaged head gasket, faulty oil pump, and bad water pump.

What To Do When The “AC Off Due To High Engine Temperature” Sign Appears

The first thing to do when you see the sign ‘’AC turned off due to high engine temp’’ on your dashboard while driving is to switch on emergency lights for other vehicles to know something is wrong with your vehicle and park in a safe place.

Then allow your vehicle to rest for about 15-20 minutes, and check the temperature gauge to be sure there’s no damage to your engine.

Check the coolant reservoir of your engine for any leaks and also check your car radiator and cooling fans

You need to be extremely careful when checking to avoid touching any hot component or hot water with your skin.

While your car is in park mode, rev your vehicle’s engine to make the fans and water pump effective. This way, air, and water can go through the radiator quicker and by doing this, the engine will cool down a bit.

After the engine has cooled down a bit, take the vehicle to an automobile repair shop for further and proper diagnostics to find the cause of this issue and fix it.

How To Prevent This From Happening

To prevent or reduce the chances of this sign from appearing on your dashboard, you should: Always run your AC for 10-15 minutes once a week. This way, air pressure can be maintained to keep the compressor in great shape.

Also, make sure you change the engine oil regularly, recharge the AC system at most, every 2 years, and finally, visit the mechanic workshop for proper inspection and maintenance regularly.

More Reading:

Leave a Reply

Your email address will not be published. Required fields are marked *

Related Posts