Standard Ignition RY-601 HVAC Automatic Temperature Control (ATC) Relay - Rear

HVAC Relay for GM Temperature Control Systems

Standard Ignition RY-601 is an HVAC automatic temperature control relay built for 12-volt systems that need reliable relay switching in the climate control circuit. It uses a rectangular connector, 4 blade terminals, and a 20 amp amperage rating for direct replacement service on many Chevrolet, GMC, Buick, Cadillac, Pontiac, Saturn, Hummer, Isuzu, and Saab applications.

Standard Ignition RY-601 is manufactured to strict quality requirements with composite housings that help protect against harsh underhood temperatures. Brass or copper contacts are used where specified for wear resistance, and production is controlled in TS16949- and ISO9001-certified facilities.

• Part number: RY-601
• HVAC automatic temperature control relay for 12V vehicle systems
• 20 amp amperage rating
• Rectangular connector shape with 4 male blade terminals
• Composite housing for harsh temperature and underhood exposure
• Standard Ignition quality control from component to finished part

Detailed Product Description

This relay is used in HVAC control circuits where the vehicle’s automatic temperature control system needs a dependable electrical switching component. It is a fitment-based replacement for many GM-platform vehicles, including Chevrolet Silverado 1500, Chevrolet Tahoe, GMC Yukon, Cadillac Escalade, and Chevrolet Impala applications listed in the fitment data. If you are replacing a failed HVAC relay on a Chevrolet Silverado 1500 or GMC Yukon, RY-601 provides the correct relay-style service part for the specified connector and terminal configuration.

This part cross-references FEL-PRO 36008 and Carlson 19264 for the same application.

What It Helps Fix

• HVAC system not responding to temperature-control commands
• Intermittent relay operation in the climate control circuit
• Blower or control circuit switching issues caused by relay wear
• Electrical connection problems related to damaged relay terminals
• Replacement needs on vehicles with the specified rectangular 4-terminal relay layout

Installation Notes and Fitment Tips

Verify the connector shape, terminal count, and terminal style before installation. This relay is listed for many vehicles across 2005-2017 model years, including Fits 2011-2017 Chevrolet Caprice, Fits 2006-2016 Chevrolet Corvette, Fits 2007-2014 Cadillac Escalade, and Fits 2006-2012 GMC Yukon XL 1500 in the configurations shown in the fitment data. Some applications note rectangular shape, gray housing, or 4 blade terminal variations, so match the original relay exactly before purchase.

Part number RY-601 should be compared against the original relay location and connector style during diagnosis. For vehicles such as Chevrolet Impala, Chevrolet Silverado 1500, and GMC Sierra 1500, confirm the notes in the fitment list to ensure the correct relay version is selected.

Quality Assurance

Standard Ignition manufactures this relay under stringent quality controls in TS16949 and ISO9001 certified plants. The brand states that housings are built to resist severe underhood conditions and that specified brass or copper contacts are used to support extended wear. RY-601 is produced with complete quality control throughout the manufacturing process.