Ford Fiesta Mk7 A/C Air Conditioning Evaporator Expansion Valve AP31-19849-AA

Ford Fiesta Mk7 A/C Air Conditioning Evaporator Expansion Valve is a component from the Evaporators category, responsible for the precise expansion of the refrigerant in the air conditioning system and its proper delivery to the heater core. A correctly selected valve ensures stable air conditioning operating parameters, which translates into thermal comfort inside the vehicle with a diesel engine.

Specifications and technical data

• SKU: AP31-19849-AA
• Mark: Ford
• Condition: Used
• OEM Part Number: AP31-19849-AA
• Substitutable numbers: AP31-19849-AA, AP3119849AA, 1718590
• Fuel type: Diesel
• Category: A/C Evaporators

Purpose and function in the air conditioning system

The presented expansion valve operates in the refrigerant circuit, regulating its flow between the high-pressure and low-pressure sides. In combination with the evaporator and the A/C heater core, it is responsible for:

• controlling the amount of refrigerant flowing into the evaporator,
• stabilizing pressure and temperature in the circuit,
• maintaining cooling efficiency under various diesel engine loads,
• reducing the risk of evaporator icing and a drop in system performance.

Thanks to its proper flow characteristics, the valve helps maintain uniform cabin cooling, which is particularly important in city driving and on longer routes.

Compatibility with Ford Fiesta Mk7 with a diesel engine

The component has been designed for air conditioning systems in the Ford Fiesta Mk7 model with a diesel powertrain. This means it is matched to:

• the geometry of lines and connections in the heater core housing,
• the operating parameters of the compressor and evaporator used in this model,
• the vehicle manufacturer's assembly standards.

Such compatibility promotes the maintenance of factory cooling characteristics and facilitates installation without the need for system modifications.

Characteristics of the used component

The offered expansion valve comes from dismantling, which allows for combining a favorable purchase cost with the preservation of the manufacturer's original design. A used component of this class is a good solution in situations where:

• the air conditioning system requires restoration of efficiency after a failure or leak,
• maintaining compliance with Ford's factory specifications is essential,
• reducing service costs while using OEM parts is a priority.

Before installation, a standard service procedure is recommended: checking the system for leaks, replacing the receiver-drier, and properly filling it with refrigerant in accordance with the vehicle manufacturer's guidelines.

Benefits of using an original expansion valve

Using an expansion valve dedicated to the Ford Fiesta Mk7 allows for maintaining the consistency of the entire air conditioning system. Key advantages include:

• maintaining factory cooling characteristics – proper pressures and temperatures in the circuit,
• better cooperation with the evaporator and A/C heater core,
• reducing the risk of unstable compressor operation,
• easier diagnostics in the future thanks to compliance with Ford service documentation.

This solution is particularly recommended for repairs where the priority is to maintain parameters close to factory settings without the need to use replacements with uncertain specifications.

If you are planning a comprehensive repair or upgrade of the air conditioning zone in your Ford and need other components from the same group, such as an evaporator, A/C lines, or mounting elements, check the available parts in the Ford Evaporators category.

Additional information and selection of used parts

When selecting used air conditioning system components, it is worth being guided by compliance with the vehicle's technical documentation and the actual condition of the component. In case of doubts regarding the service strategy and the cost-effectiveness of using reclaimed parts in other system subassemblies, an article describing a practical approach to the regeneration and replacement of brake components may be helpful – you can find it here: Brake calipers under the microscope – how to safely use reclaimed parts.