Standard Ignition RY-24 HVAC Automatic Temperature Control (ATC) Relay

HVAC Relay for Automatic Temperature Control

Standard Ignition RY-24 is an HVAC automatic temperature control relay built for 12-volt systems that need reliable switching in the climate control circuit. It uses a rectangular connector, 4 male blade terminals, and a 20 amp amperage rating for direct-fit service on listed Cadillac and Oldsmobile applications.

Compatible With 1976-1985 Cadillac Cimarron, DeVille, Eldorado, Fleetwood, Seville, Commercial Chassis, and 1980 Oldsmobile Toronado applications that call for this relay style. Standard Ignition RY-24 is also a cross-reference for Dorman 1611357 and Four Seasons 83105 for the same application.

Key Features

• Part number: RY-24
• HVAC automatic temperature control (ATC) relay
• 12-volt electrical system
• 20 amp amperage rating
• Rectangular connector shape
• 4 male blade terminals
• Relay included
• No mounting bracket included
• Continuous duty: No

Product Details

This relay is used in HVAC control circuits where the automatic temperature control system needs a switched electrical signal. Standard Ignition builds the RY-24 with composite housing materials to withstand heat and underhood exposure, and uses brass or copper contacts where specified to support wear resistance. Manufacturing is controlled to stringent quality standards in TS16949- and ISO9001-certified plants, helping ensure consistent fit and function for the listed vehicle applications.

What This Relay Helps Address

• HVAC blower or control circuit relay failure
• Intermittent automatic temperature control operation
• No-response climate control switching
• Electrical contact wear in the relay circuit
• Heat-related relay housing deterioration

Installation Notes and Tips

• Verify the vehicle uses automatic temperature control before installation where noted in fitment.
• Confirm the connector is rectangular and the terminal count is 4 blade terminals.
• Check OE reference numbers when matching an existing relay: some applications list OE No. 1611357 or 1621806.
• Fitment includes Cadillac Cimarron, DeVille, Eldorado, Fleetwood, Seville, Commercial Chassis, and Oldsmobile Toronado applications across 1976-1985 model years.

Quality Assurance

Standard Ignition manufactures this relay under controlled quality processes with certified production systems and component-level oversight from raw materials through finished product. The RY-24 is built to meet the requirements of the listed vehicle applications and to provide consistent electrical performance in HVAC relay service.