The Red Dot 71R8451 Gold Bulbless Block-Type Expansion Valve is designed for heavy-duty mobile HVAC systems requiring stable refrigerant control without an external sensing bulb. Bulbless block TXVs regulate internally, reducing components and improving durability in high-vibration on-highway environments.
This model is engineered specifically for Freightliner C112, C120, Century, Columbia, and Coronado platforms. It features Stat-O-Seal fittings on both hose and evaporator connections, an 8.5°F superheat rating, and a 53.5 psig pressure limit at 90°F. The gold-finish housing helps identify this premium configuration during service and replacement.
Use the specifications and interchange numbers below to confirm the correct match before ordering.
On-Road Applications
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Freightliner:
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C112
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C120
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Century
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Columbia
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Coronado
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Product Specifications
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Part Type: A/C Expansion Valve
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Valve Style: Bulbless Block-Type
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Finish: Gold
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Red Dot Part No.: 71R8451
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Red Dot Factory No.: RD-5-10903-0P
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Replaces OE: ABP N83 308231
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Superheat Rating: 8.5°F
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Pressure Limit: 53.5 psig @ 90°F
Connections (Stat-O-Seal):
Hose Side
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Inlet: #6 (3/8 in.) Stat-O-Seal
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Outlet: #10 (5/8 in.) Stat-O-Seal
Evaporator Side
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Inlet: #8 (1/2 in.) Stat-O-Seal
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Outlet: #10 (5/8 in.) Stat-O-Seal
OEM & Interchange Numbers
OEM Numbers:
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Alliance: ABP N83 308231
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Mack: 4379-RD5109030
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Volvo: RDHRD5109030P
Aftermarket / Interchange:
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Texas Truck AC: 450-6602
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CoolStar / MEI: 520-1410
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Road Choice: EV01410
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Red Dot Aftermarket: 71R8451
Additional Interchange References:
4379-RD5109030, 4379-RD5109030P, ABP N83 308231, RDHRD5109030P, RDT71R8451, VCC88000030
(Always verify Stat-O-Seal fitting type, superheat rating, and pressure limit prior to installation.)
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