AC Off Due to High Engine Temp

AC Off Due to High Engine Temp

The last thing you want is for your air conditioning (AC) to stop working when it’s hot outdoors. Unfortunately, a high engine temperature is one of the most frequent causes of AC system failure. This article will define the issue, discuss its causes, and offer solutions.

Understanding the Problem

It’s crucial to understand how the two systems are connected in order to comprehend why a high engine temperature can cause your AC to shut off. Your car’s air conditioning system uses a compressor that is driven by the engine’s belt. The belt may slip or stretch when the engine is running hot, which could prohibit the compressor from working. High engine temperature can also harm the condenser or evaporator, as well as other parts of the air conditioning system.

The AC will normally cut off to prevent further harm when the engine temperature is too high, and you’ll typically see a warning light on your dashboard. To prevent expensive repairs and more harm to your car’s engine and other systems, it’s imperative to take care of this issue as soon as you can.

Common Causes and Diagnosis

High engine temperature and AC switch off are two problems that might be caused by a number of things. Among the most frequent causes are:

Low coolant levels: To keep the engine cool, coolant is a liquid that passes through the engine. The engine may overheat if the coolant level is low. Check the coolant level in the reservoir, which is normally found close to the front of the engine, to identify this issue. You will require more coolant if the level is low.

Both the radiator and the AC condenser are in charge of dissipating heat from the engine. Clogged radiator or AC condenser These parts could be unable to perform their functions effectively if they are clogged with debris. You can visually check the radiator and condenser for any indications of obstruction to detect this issue.

The thermostat regulates the flow of coolant into the engine and is malfunctioning. The engine may overheat if the thermostat gets stuck in the closed position. You can use an infrared thermometer to verify the coolant temperature and compare it to the temperature displayed on your dashboard gauge to identify the issue.

Hoses that are leaking or damaged might develop over time, especially those that transport coolant to and from the engine. This could result in coolant leaking out of the system and a hot engine. You can visually examine the hoses for any indications of damage or leakage to identify this issue.

Water pump failure: The water pump is in charge of moving coolant through the engine. The engine will overheat if the water pump malfunctions, making it unable to keep cool. You can look for leaks or other damage on the water pump to help you identify the issue.

As was previously noted, the engine’s belt drives the compressor for the air conditioner. If the belt becomes strained or worn, the compressor may cease working. You can look for wear or damage on the belt to help you identify the issue.

Failure of the head gasket: If the head gasket fails, coolant and engine oil may mix, resulting in overheating and a buildup of pressure in the cooling system. The mechanic should look for traces of coolant in the oil or pressure in the cooling system, both of which might be indicators of a failed head gasket, in order to identify this issue.

Fixing the Problem

Fixing the Problem

You can take action to address the issue once you’ve determined what is causing the engine to run hot and the AC to switch off. To address each of the above-mentioned common causes, consider the following advice and pointers:

Low coolant levels: You’ll need to add more coolant to the system to solve this issue. Use only the type of coolant recommended for your car in the owner’s handbook. Before adding more coolant, make sure the system is free of leaks since they could make the issue come back.

Remove any obstructions or dirt from the radiator and condenser to solve this issue if it is a clogged radiator or AC condenser. Clean these parts lightly with a hose or a soft brush. It might be essential to remove the radiator or condenser for cleaning if the obstruction is severe.

In order to resolve this issue, you will need to replace the thermostat. With simple instruments, this procedure is fairly easy to complete. Use a thermostat that is made specifically for the make and model of your car.

Hoses that are leaking or damaged: To resolve this issue, you must replace any hoses that are leaking or broken. A replacement hose, which can be acquired from an auto parts store, and some simple tools are usually all that are required to complete this. Use only hoses that are intended for your particular vehicle’s make and model.

Failed water pump: To resolve this issue, a new water pump must be installed. Given that the pump is inside the engine and may need some disassembly, this remedy may be a little more difficult than the others.

Belt(s) that are stressed or worn out: You will need to replace the belt to resolve this issue. Using simple instruments and a reasonably straightforward method, this can usually be accomplished. Use a belt that is made for the make and model of the car you are driving.

Failed head gasket: A professional mechanic must replace the head gasket to resolve this issue because it necessitates disassembling the engine and resurfacing the head, a difficult task that calls for specific equipment and knowledge.

Future problems with the engine temperature and AC system can be avoided with proper maintenance. Check your coolant levels frequently, keep an eye out for any warning indications, and have your car serviced as often as the manufacturer suggests.


In conclusion, a common issue that can be brought on by a number of circumstances is a high engine temperature and AC shutoff. You’ll be better able to identify the issue and resolve it if you comprehend the fundamental workings and frequent root causes. Keep in mind that it is always a good idea to take the car to a qualified mechanic for a checkup if you are unsure about the diagnosis or the fix.