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2 months ago

Summer Heatwaves and EV Air Conditioning and Cooling System Challenges in Jordan: Causes and Smart Solutions

A Technically Modified Version Specialized Exclusively for Electric Vehicles

With the noticeable rise in summer temperatures in Jordan, complaints from some electric vehicle (EV) owners regarding a decline in cabin cooling and air conditioning (AC) efficiency are on the rise. Drivers may notice that the cooling is weaker than usual or that energy consumption spikes when the AC is operated for extended periods, especially when driving in scorching weather or when the vehicle is parked under direct sunlight.

However, it is crucial to clarify that these issues do not necessarily mean there is a major defect in the vehicle, nor do they apply to all electric vehicles in the same manner. The causes vary significantly depending on the AC system design, maintenance history, vehicle model, battery thermal management system (BTMS), and ambient temperatures.

This article reviews the most common AC and cooling system challenges faced by EVs in Jordan, highlighting the potential technical causes and practical solutions to maintain vehicle efficiency and battery performance.

First: Why Do These Issues Appear in Some Electric Vehicles?

Electric vehicles rely on cooling and climate control systems that differ fundamentally from traditional internal combustion engine (ICE) cars. In an EV, the AC compressor is electrically driven and does not rely on an engine belt. Furthermore, the battery pack requires precise thermal management to maintain its performance and operational lifespan.

AC issues in some EVs can surface due to several factors, including: extreme summer temperatures, accumulation of dust and debris on the front condenser, poor routine maintenance, a clogged cabin air filter, undercharging or overcharging the refrigerant (gas), or faults in the cooling fans, sensors, and thermal management software.

Additionally, many EVs imported into Jordan were originally manufactured for foreign markets with different operating conditions, meaning they might require more meticulous care and specific maintenance when driven in Jordan's hot climate.

Second: Most Common Cooling and AC Challenges in EVs

1. Reduced Cabin Cooling Efficiency

Drivers might notice the AC failing to cool the cabin adequately, especially after the vehicle has been parked in the sun or during peak midday heat. In EVs, weak cooling is not tied to engine RPMs since the compressor is electric; instead, the issue often stems from a dirty condenser, failing cooling fans, low refrigerant levels, a clogged air filter, or system management glitches.

2. Increased Energy Consumption When Operating the AC

An EV's climate control system draws power directly from the high-voltage (HV) traction battery. Consequently, running the AC in hot weather increases energy consumption and reduces the vehicle's driving range per charge. The severity of this impact depends on ambient temperatures, cabin size, thermal insulation quality, the desired cooling intensity, and driving habits. While a minor drop in range is completely normal during summer, a massive or sudden drop could indicate an underlying issue that requires diagnostics.

3. Misconceptions: Cabin Climate Control vs. Battery Cooling

A common misconception among drivers is that cabin AC and battery cooling always operate in the exact same manner or share the identical loop. In reality, battery thermal management systems (BTMS) vary greatly from one EV to another based on the vehicle architecture and manufacturer design.

Generally, EV battery cooling is achieved through three primary methods:

Liquid Cooling (Coolant): A specialized coolant liquid is circulated through internal channels or cooling plates adjacent to the battery cells to absorb and dissipate heat. This is the most prevalent system in modern EVs due to its high efficiency in regulating battery temperatures.
Refrigerant-Based Cooling (Direct/Indirect): In certain designs, the vehicle's AC system integrates directly into the battery thermal management. This is often done via a refrigerant-to-coolant heat exchanger known as a Chiller, allowing the AC refrigerant to drastically lower the coolant temperature or boost battery cooling when needed.
Air Cooling: A system utilized in older or budget-oriented EV designs. It relies on airflow—either natural ram-air forced from the front of the vehicle during motion or air directed via electric fans—to cool the battery pack.

Therefore, a weak cabin AC does not automatically mean the battery is not being cooled, and turning off the passenger AC does not necessarily stop battery cooling. The battery cooling system can operate independently or as part of an integrated thermal management system controlled by the vehicle's ECU based on real-time cell temperatures, driving conditions, or charging states.

The Heat Pump is a separate system primarily designed to improve heating efficiency in EVs. It works on a principle similar to air conditioning but reverses the cycle to move heat into the cabin rather than generating it directly via energy-draining resistive heaters (PTC heaters). In advanced modern EVs, the heat pump is part of a broader, comprehensive thermal management loop that helps precondition or heat/cool both the cabin and the battery as needed, but it does not mean cabin AC and battery cooling always share the exact same active circuit.

4. Sudden Compressor Shutdown or Voltage Cut-off

In some instances, the vehicle's onboard protection system may scale back or temporarily shut down the electric compressor if pressure or temperatures within the loop rise to unsafe levels. This can happen due to an incorrect refrigerant charge, a blocked condenser, fan failure, the use of improper compressor oil, or sensor errors. This scenario requires immediate attention at a specialized EV service center; EV compressors operate on high-voltage power, and incorrect servicing can result in catastrophic and highly expensive damage.

Third: Potential Technical Causes Behind Weak Cooling

Accumulation of dust, dirt, and road debris on the front condenser, which severely reduces heat exchange efficiency.
A clogged or worn cabin air filter, restricting airflow into the passenger cabin.
An incorrect refrigerant charge (either undercharged or overcharged), both of which degrade cooling performance.
Using a type of refrigerant or compressor oil that does not match the manufacturer's exact specifications.
A failing front cooling fan, or a malfunction in the temperature/pressure sensors.
Software glitches within the thermal management module of certain modern EVs, requiring an ECU software update from the dealership or a specialized center.

Poor thermal insulation, especially if the vehicle lacks window tinting and sits under direct sunlight for long periods.

Fourth: What About the Type of Refrigerant (Freon)?

There is no such thing as "hot climate freon" versus "cold climate freon" in a technical sense. The only correct practice is adhering strictly to the specific type of refrigerant, compressor oil, and exact weight prescribed by the manufacturer.

Some EVs utilize R134a gas, while newer models adopt the more eco-friendly R1234yf refrigerant; these types must never be mixed or interchanged. Furthermore, using a highly specific, non-conductive compressor oil formulated exclusively for electric vehicles is mandatory. Traditional compressor oils are conductive and can breach the electrical insulation within the high-voltage system, leading to dangerous insulation faults and destroying the electric compressor. Always check the specification label under the hood or refer to the owner's manual before adding fluids.

Fifth: Practical and Smart Solutions to Resolve the Issue

1. Cleaning the Front Condenser and Radiator

Gently cleaning the front condenser to remove dust and debris significantly improves airflow and boosts heat rejection efficiency. The percentage of improvement varies based on the vehicle's condition and how dirty the fins were. Cleaning should be done using moderate water pressure; excessive pressure can bend the delicate aluminum fins or damage nearby sensors.

2. Checking the Refrigerant Charge and Oil Type

Have the system pressures and refrigerant weight checked at a certified EV service center. A deficit in gas degrades cooling, while an overcharge elevates system pressure, forcing the compressor to work harder or shut down. Most importantly, ensure the use of specialized polyolester (POE) or specified non-conductive oil for the electric compressor to safeguard the high-voltage system.

3. Replacing the Cabin Air Filter

A restricted cabin filter chokes airflow, making the AC feel remarkably weak even if the rest of the system is functioning perfectly. It is highly recommended to replace the cabin filter at the beginning of the summer season, or sooner if the vehicle is frequently driven in dusty areas.

4. Diagnosing Fans and Sensors

If the AC performance drops specifically when the vehicle is stationary or when ambient temperatures peak, the culprit is often a failing front cooling fan, a faulty pressure transducer, a glitchy ambient temperature sensor, or blocked active grille shutters. These issues require a diagnostic scanner check rather than simply adding more gas.

5. Updating Vehicle Software

Many electric vehicles rely heavily on over-the-air (OTA) or manual software updates to govern climate control and battery cooling algorithms. Updating the vehicle's thermal management module can significantly optimize performance, especially if the manufacturer has released a patch designed to handle extreme heat climates.

Sixth: Smart Tips for Summer AC Usage

Utilize Pre-cooling (Pre-conditioning): Turn on the AC remotely via the vehicle’s app before departing, especially while the car is still plugged into a charger. This cools the cabin using grid power instead of depleting the battery's driving range on the road.
Enable Air Recirculation: Once the initial trapped hot air escapes the cabin, switch the AC to recirculation mode. Recooling the already conditioned cabin air significantly lowers the workload on the electric compressor.
Park Strategically: Seek shaded parking spaces whenever possible and use high-quality windshield sunshades to minimize cabin heat soak before starting the vehicle.
Apply Premium Thermal Window Tint: Using legally compliant, high-rejection ceramic thermal tint drastically reduces solar heat gain, taking massive stress off the AC system.
Prioritize Pre-Summer Maintenance: Do not delay routine checks. Inspect the filter, condenser, fans, and system pressures before the peak summer heatwaves hit Jordan.

Conclusion

Air conditioning issues in electric vehicles during Jordan's summer do not always indicate a mechanical defect; they are often a natural byproduct of extreme ambient heat, overlooked maintenance, or regional differences in thermal management programming.

The key takeaway is to never confuse cabin comfort with battery cooling. Battery cooling can be managed independently via liquid coolants, refrigerant chillers, or air systems depending on the vehicle’s engineering generation. Because EV compressors operate on high-voltage architecture and require specialized, non-conductive lubricants, they must never be treated like traditional ICE vehicle AC systems. Proper maintenance, regular cleaning, using manufacturer-approved fluids, and keeping the vehicle's software up to date are the ultimate steps to ensuring optimal cabin cooling and peak battery health throughout the Jordanian summer.