The Red Dot 71R9004 Liquid Line Refrigerant Solenoid Valve (RD-4188-24P) is a 24-volt liquid line solenoid valve designed for heavy-duty mobile A/C systems. It controls refrigerant flow in the liquid line and prevents refrigerant migration when the system cycles off.
This valve features a #6 Male O-Ring fitting and is commonly used in 24V heavy-duty truck HVAC systems, including Red Dot sleeper units.
Because it is built for commercial equipment, it delivers consistent performance under vibration, long idle periods, and demanding operating environments.
Product Specifications
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Red Dot Part No.: 71R9004
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Red Dot Factory No.: RD-4188-24P
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Voltage: 24 Volt
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Fitting Type: #6 Male O-Ring
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Application: Red Dot Sleeper Heater / A/C Unit R-4122
OEM Cross References
Caterpillar: 232-8581
Freightliner: RDH RD4188 24
Kysor: 1899017
Mack: 4379-RD418824
Volvo: RDHRD418824P
Complete Interchange Information
This valve directly replaces or interchanges with:
1899017
232-8581
29-40007
404205
4379-RD418824
4379-RD418824P
71R9004
RDH RD4188 24
RDHRD418824P
RDT71R9004
(Verified interchange numbers intentionally included for search capture and fitment confirmation.)
Why Liquid Line Solenoids Matter
When the A/C system shuts off, refrigerant migration can cause compressor stress and hard starts. This 24V liquid line solenoid closes when de-energized, helping maintain proper refrigerant control and protecting system components.
As a result, it plays a key role in maintaining reliable performance in sleeper and heavy-duty HVAC applications.
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