What's the reason for engine warning light and air conditioning not cooling?
3 Answers
Reasons for engine warning light and air conditioning not cooling: lack of refrigerant, dirty condenser. Detailed explanations of the reasons: Lack of refrigerant: Car air conditioners generally require refrigerant replenishment every 2-3 years, with some vehicles needing it annually. Even with excellent sealing, refrigerant can still escape, especially if there are minor leaks in the air conditioning pipes or condenser. Dirty condenser: During summer when poor air conditioning performance is noticed, testing may show no issues with the system and normal high/low pressure readings. When visiting a 4S shop for repairs, mechanics often recommend cleaning the radiator. The primary purpose of cleaning the radiator and condenser is to improve heat dissipation.
That day I was driving on the highway when suddenly the engine warning light came on, and the AC started blowing hot air instead of cooling. It was really scary, so I quickly pulled over to check. Looking back, it might have been due to a problem with the engine belt—if it's loose, it can't drive the AC compressor. The heat inside the car during summer is unbearable, making people irritable and even dangerous. Later, at the repair shop, the mechanic said it was a chain reaction caused by engine belt wear and insufficient coolant. Replacing the belt and topping up the coolant fixed the issue. So, if you encounter this situation, don’t push through—first find a safe spot to check if the belt has cracks or is loose. But it’s best not to tamper with it yourself; call a professional for help. Delaying could damage more parts, making repairs even costlier.
I've always enjoyed studying cars, and there are usually several reasons for this situation. Engine warnings may involve electronic control unit failures, such as sensor false alarms or wire short circuits, triggering the system's protection mode to automatically shut down the air conditioning compressor to conserve power. On the other hand, air conditioning not cooling is often due to refrigerant leaks or a faulty compressor itself. I've tried this on my own car—you can first check the trouble codes with simple tools to diagnose engine issues, while also inspecting whether the AC pipes are leaking or if the cooling fan is running. Remember to ensure stable battery voltage, as low voltage can also trigger alarms. Overall, these problems are often interconnected, so fixing them early prevents minor issues from becoming major ones. Friends with strong DIY skills can perform initial troubleshooting, but for complex issues, professional intervention is still necessary.
