Standard Ignition RY-74 HVAC Temperature Delay Relay

HVAC Temperature Delay Relay for Chrysler and Dodge

Standard Ignition RY-74 is an HVAC temperature delay relay built for select Chrysler, Dodge, and Plymouth applications from the 1980s and early 1990s. It uses a 12-volt design with a rectangular female connector, male blade terminals, and an included mounting bracket for direct replacement service.

Key Features

• 12-volt HVAC temperature delay relay
• Rectangular 1-connector design with female connector gender
• 4 male blade terminals for vehicle-specific electrical connection
• Mounting bracket(s) included for secure installation
• Composite housing built for harsh underhood temperatures
• Brass or copper contacts used where specified for wear resistance
• Manufactured under TS16949 and ISO9001 certified quality systems

Product Details

The Standard Ignition RY-74 is an HVAC temperature delay relay used in climate control and compressor-related circuits on many Chrysler, Dodge, and Plymouth vehicles. It is listed for applications such as the Dodge Caravan, Dodge Grand Caravan, Chrysler LeBaron, Plymouth Voyager, and Dodge Dakota, along with other fitments across the 1983-1990 model years. This part cross-references Gates 19839 for the same application. If you are replacing a failed HVAC temperature delay relay on a Chrysler Voyager or Dodge Daytona, RY-74 provides the correct connector style and terminal layout for the listed vehicles.

Common Problems This Part Addresses

• Intermittent HVAC relay operation
• Compressor cut-off or delayed compressor engagement
• Blower or climate control electrical faults tied to relay failure
• Heat-related relay damage in the engine compartment
• Connector or terminal mismatch during relay replacement

Installation Notes and Tips

Verify the OE number, connector shape, terminal count, and mounting style before installation. This relay uses a female rectangular connector with 4 male blade terminals, so it should be matched to the original unit on the vehicle. Confirm the application notes for your exact Chrysler, Dodge, or Plymouth model, especially where OE numbers such as 4221576 or 4339495 are listed in the fitment data. For best results, inspect the connector for corrosion or heat damage before installing the new relay.

Quality Assurance

Standard Ignition manufactures this relay with composite housings intended to withstand severe underhood conditions and uses controlled production processes from component sourcing through final assembly. The part is produced in TS16949 and ISO9001 certified facilities to support consistent fit and function across the listed Chrysler, Dodge, and Plymouth applications.