MEI 1310 AC High Pressure Fan Override Switch for Heavy Duty Trucks

The MEI 1310 is a 12-volt AC high-pressure fan override switch designed for heavy-duty truck air conditioning systems. This normally closed (NC) pressure switch is engineered to activate the cooling fan when refrigerant pressure reaches critical levels, helping to prevent system damage and maintain optimal HVAC performance in demanding commercial vehicle applications.

Key Features:

• Actuation pressure: 310-325 PSI (opens at high pressure)
• Deactuation pressure: 240-250 PSI (closes when pressure normalizes)
• 12-volt DC operation with Packard-style 2-pin orange connector
• Female M10 x 1.25 metric thread fitting for secure installation
• Normally closed (NC) operation for fail-safe protection
• R134a refrigerant compatible
• Direct replacement for Peterbilt OEM part numbers 79PSL3-4, F27-1051, and P27-1051

This pressure switch is commonly used in Peterbilt trucks and other Class 6, 7, and 8 heavy-duty vehicles. As part of the air conditioning system's safety controls, it monitors refrigerant pressure and triggers the cooling fan override to prevent compressor damage and maintain system efficiency. The MEI 1310 provides reliable pressure monitoring for professional fleet operations in all climate conditions.

Cross-Reference Part Numbers: Truck Air 11-1409, Peterbilt 79PSL3-4, F27-1051, P27-1051, and various aftermarket equivalents including 850-8423A, T4175, and PTAC1310.