BOSCH Expansion Valve, Air Conditioning System

Compatible with SMART FORTWO Coupe (451) , SMART FORTWO Cabrio (451) ,
This BOSCH expansion valve is a crucial component for your vehicle's air conditioning system, ensuring optimal performance and cooling efficiency.
20.92 EUR
inc. VAT 21%
In stock 1
Delivery 1 day (25.03.2026)
PN 1986AD5171
Make BOSCH
EAN 4047026952865

The expansion valve, also known as a metering device, plays a vital role in the refrigeration cycle of your car's air conditioning. It controls the flow of refrigerant into the evaporator, precisely regulating the pressure and temperature. This precise control is essential for efficient cooling and preventing damage to other AC components. Crafted by BOSCH, a trusted name in automotive parts, this expansion valve is designed to meet stringent quality standards. Its durable construction ensures reliable operation and longevity, even under demanding conditions. Proper functioning of the expansion valve is key to maintaining a comfortable cabin temperature during hot weather.

  • Direct replacement for original equipment.
  • Ensures precise refrigerant flow control.
  • Maintains optimal AC system pressure and temperature.
  • Contributes to efficient cooling performance.
  • Durable construction for long-lasting reliability.
  • Manufactured by BOSCH, a leading automotive supplier.
Length [mm]
33
Height [mm]
83
Width [mm]
+25
Intake pipe diameter 1 [mm]
8,6
Inlet pipe diameter 2 [mm]
17,7
Exhaust diameter 1 [mm]
11,8
Exhaust diameter 2 [mm]
17,7
Coolant
R 1234yf
Coolant
R 134a
Additional article/Additional info 2
with sealing ring
  • SMART
    • FORTWO Coupe (451)
      • electric drive (451.391, 451.390) (20kW/27PS)
      • 1.0 Turbo (451.332) (62kW/84PS)
      • 1.0 (451.330, 451.334) (45kW/61PS)
      • 1.0 (451.331, 451.380) (52kW/71PS)
      • 0.8 CDi (451.300) (33kW/45PS)
      • 1.0 Brabus (451.333) (72kW/98PS)
      • 0.8 CDi (451.301) (40kW/54PS)
      • 1.0 Turbo Brabus (451.333) (75kW/102PS)
      • electric drive (451.391) (30kW/41PS)
      • electric drive (451.390, 451.391) (55kW/75PS)
      • electric drive Brabus (451.392) (60kW/82PS)
      • electric drive (451.390) (35kW/48PS)
    • FORTWO Cabrio (451)
      • electric drive (451.490, 451.491) (20kW/27PS)
      • 1.0 (451.431, 451.480) (52kW/71PS)
      • 1.0 Turbo (451.432) (62kW/84PS)
      • 0.8 CDi (451.400) (33kW/45PS)
      • 1.0 Brabus (451.433) (72kW/98PS)
      • 0.8 CDi (451.401) (40kW/54PS)
      • 1.0 Turbo Brabus (451.433) (75kW/102PS)
      • electric drive Brabus (451.492) (60kW/82PS)
      • electric drive (451.491) (30kW/41PS)
      • electric drive (451.490, 451.491) (55kW/75PS)
      • electric drive (451.490) (35kW/48PS)
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