Universal Air SW1135C HVAC Pressure Switch

Universal Air LPCO Switch SW1135C Overview

Universal Air SW1135C is an HVAC pressure switch for low-pressure cutout control in select GM applications. It is listed under the LPCO Switch product line and is used in systems that require pressure-based compressor protection.

Compatible With 1986-1993 Buick Riviera, 1987-1993 Cadillac Commercial Chassis, 1987-1993 Cadillac DeVille, 1986-1993 Cadillac Eldorado, 1986-1993 Cadillac Fleetwood, 1986-1993 Cadillac Seville, 1987-1992 Cadillac Brougham, 1986-1992 Oldsmobile Toronado, and 1988-1991 Buick Reatta. Part number SW1135C is also referenced for OE Number 1631399 on Buick Riviera applications.

Key Features

• HVAC pressure switch for low-pressure cutout function
• Universal Air LPCO Switch product line
• Direct fitment coverage for select Buick, Cadillac, and Oldsmobile models
• Supports pressure-based A/C compressor control in factory-style systems
• Part number SW1135C for identification and ordering

Detailed Description

The SW1135C is an HVAC pressure switch used in air conditioning systems that rely on low-pressure cutout logic to protect the compressor and maintain proper system operation. This Universal Air LPCO Switch is cataloged for a range of 1986-1993 Buick Riviera, Cadillac, and Oldsmobile platforms, including Cadillac DeVille, Eldorado, Fleetwood, Seville, Brougham, Commercial Chassis, Buick Reatta, and Oldsmobile Toronado. If you are searching for a Buick Riviera HVAC pressure switch or a Cadillac LPCO switch, SW1135C provides the listed application match.

This part cross-references OE Number 1631399 for the same Buick Riviera application.

What It Helps Address

• A/C compressor cycling caused by low refrigerant pressure conditions
• Compressor protection logic in factory HVAC systems
• Faulty pressure-switch-related A/C engagement issues
• Intermittent cooling operation tied to pressure switch wear
• Replacement needs for select Buick, Cadillac, and Oldsmobile HVAC systems

Installation Notes and Tips

Verify the original switch style, connector, and system mounting requirements before installation. Match the vehicle year, make, and model exactly to the listed fitment, especially on Cadillac Commercial Chassis and Cadillac Brougham applications that note system mounting. Confirm the HVAC system is properly evacuated and serviced by a qualified technician before replacing pressure-sensitive components.

Quality Assurance

Universal Air catalogs this part as an LPCO Switch for the specified factory applications. Confirm part number SW1135C against the vehicle’s original HVAC pressure switch and OE reference before installation.