Global Parts 1711421 HVAC Pressure Switch

HVAC Pressure Switch for Mercedes-Benz A/C Control

Global Parts 1711421 is an HVAC pressure switch that sends pressure feedback to the engine management system. On modern Mercedes-Benz applications, the ECM uses this signal to manage A/C operation; on earlier vehicles, the switch can directly shut the compressor off to help prevent compressor damage.

• Binary normal-open HVAC pressure switch design
• 3/8"-24 male thread connection
• High-pressure open at 398 psi
• High-pressure close at 312 psi
• Low-pressure close at 28 psi
• Direct replacement style for select Mercedes-Benz A/C systems

Application Details

This Global Parts 1711421 pressure switch is used in Mercedes-Benz HVAC systems that rely on binary pressure control for compressor protection and ECM feedback. It is a fitment-based replacement for select Mercedes-Benz E300, E320, E420, E500, 190E, 300SD, 300SE, 300SL, 380SE, 380SL, SL320, SL500, and SL600 models. This part cross-references Four Seasons 36574 for the same application.

• Fits 1995 Mercedes-Benz E300, N/A
• Fits 1994 Mercedes-Benz E320, N/A
• Fits 1994 Mercedes-Benz E420, N/A
• Fits 1994 Mercedes-Benz E500, N/A
• Fits 1991-1993 Mercedes-Benz 190E, N/A
• Fits 1984-1988 Mercedes-Benz 190E, N/A
• Fits 1992-1993 Mercedes-Benz 300SD, N/A
• Fits 1988-1993 Mercedes-Benz 300SE, N/A
• Fits 1990-1993 Mercedes-Benz 300SL, N/A
• Fits 1985 Mercedes-Benz 380SE, N/A
• Fits 1985 Mercedes-Benz 380SL, N/A
• Fits 1994-1995 Mercedes-Benz SL320, N/A
• Fits 1994-1995 Mercedes-Benz SL500, N/A
• Fits 1994-1995 Mercedes-Benz SL600, N/A

What It Helps Address

• A/C compressor cycling caused by incorrect refrigerant pressure readings
• Compressor shutdown from low-pressure or high-pressure protection events
• Loss of ECM pressure feedback on electronically managed A/C systems
• Faulty HVAC pressure switch operation on Mercedes-Benz climate control systems
• Intermittent A/C engagement on select Mercedes-Benz E-Class and SL-Class vehicles

Installation Notes and Tips

Verify the thread size, pressure thresholds, and connector style before installation. Confirm the vehicle uses a binary normal-open pressure switch with the listed operating points, and inspect the A/C system for refrigerant charge issues or wiring faults that could affect switch performance. For best results, compare the original part number and system specifications before replacement.

Quality Assurance

Global Parts 1711421 is built as an HVAC pressure switch replacement for select Mercedes-Benz applications and is specified to match the listed pressure settings and thread configuration. Use the confirmed fitment and interchange references to verify application before ordering.