Standard Ignition RY-85 HVAC Automatic Temperature Control (ATC) Relay

Brand Standard Ignition RY-85
Amperage Rating 20 A
Connector Gender Female
Connector Shape Square
Contents Relay
Functions Headlamp Motor Relay
Mounting Bracket(s) Included No
Terminal Gender Male
Terminal Type Blade
Voltage 12
Fits Oldsmobile, Chevrolet, GMC, Pontiac, Buick, and Cadillac · 289 vehicles

OE-quality construction. Built to stringent standards for dependable HVAC relay performance.

Composite housing. Helps protect against harsh temperatures and severe underhood conditions.

Brass or copper contacts. Promote extended wear where specified.

Cross-references Four Seasons 35915, 1R1257 and 56-1721 for the same application. See all 11.

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HVAC Relay for OE-Style Temperature Control

Standard Ignition RY-85 is an HVAC automatic temperature control relay built for 12-volt systems that use a 20 amp relay with a female square connector and 4 male blade terminals. It is used in a range of GM applications, including Chevrolet Corvette, Camaro, S10, and Oldsmobile Cutlass and Delta 88 models where the relay layout matches the original design.

Key Features

  • 20 A amperage rating for HVAC relay circuits
  • 12-volt electrical specification
  • Female connector with square shape
  • 4 male blade terminals for direct-style connection
  • Composite housing helps protect internal components from heat and underhood exposure
  • Brass or copper contacts are used where specified for wear resistance
  • Manufactured under TS16949 and ISO9001 quality systems

Product Details

The Standard Ignition RY-85 is an HVAC ATC relay used in automatic temperature control and related relay circuits, including headlamp motor relay applications listed by the manufacturer. Standard Ignition builds this relay with durable composite housing materials and controlled contact materials to support consistent electrical performance. This part cross-references Four Seasons 35915 for the same application. For buyers searching for a Standard Ignition RY-85 relay for Chevrolet Corvette or Oldsmobile Cutlass HVAC repair, this OE-style replacement is built to match the connector and terminal configuration used on the vehicle.

Common Problems This Relay Can Address

  • HVAC system relay failure causing loss of automatic temperature control function
  • Intermittent blower or control circuit operation tied to relay wear
  • Electrical connection issues from damaged relay terminals or housing
  • Heat-related relay breakdown in underhood environments
  • Incorrect relay replacement when the original uses a square connector and 4 blade terminals

Installation Notes and Fitment Tips

Compatible With 1980-1992 GM applications listed in the fitment data, including Fits 1984-1985 Chevrolet Corvette, N/A; Fits 1985-1987 Chevrolet Camaro, N/A; Fits 1988 Chevrolet S10, N/A; Fits 1986-1988 Chevrolet S10 Blazer, N/A, w/ Rally Gauge Package; OE No. 10039961; Fits 1985-1987 Oldsmobile Cutlass, N/A; and Fits 1982-1985 Pontiac 6000, N/A. Verify connector shape, terminal count, and OE reference before installation, especially on vehicles with automatic temperature control exclusions or special equipment notes. The RY-85 part number should be matched to the original relay style before replacement.

Quality Assurance

Standard Ignition manufactures this relay under stringent quality requirements with TS16949 and ISO9001 certified production systems. The brand states that it maintains quality control from component selection through finished product assembly to help ensure the right part is supplied for the intended vehicle application. Standard Ignition RY-85 is built with the material and electrical specifications needed for consistent relay service in demanding automotive HVAC circuits.

This part fits 289 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelBody TypeDrive TypeLitersCylindersFuel TypePositionNotes
1992OldsmobileCustom Cruiser—————N/A—
1992OldsmobileCutlass Ciera—————N/A—
1991OldsmobileCustom Cruiser—————N/A—
1991OldsmobileCutlass Ciera—————N/A—
1990ChevroletCorvette—————N/A—
1990OldsmobileCustom Cruiser—————N/A—
1989OldsmobileCustom Cruiser—————N/A—
1988ChevroletCorvette—————N/A—
1988ChevroletS10——4.3LV6—N/A—
1988ChevroletS10 Blazer——4.3LV6—N/Aw/ Rally Gauge Package; OE No. 10039961
1988ChevroletS10 Blazer——2.8LV6—N/Aw/ Rally Gauge Package; OE No. 10039961
1988GMCS15——4.3LV6—N/Aw/ Rally Gauge Package
1988GMCS15——2.8LV6—N/Aw/ Rally Gauge Package
1988GMCS15 Jimmy——4.3LV6—N/Aw/ Rally Gauge Package
1988GMCS15 Jimmy——2.8LV6—N/Aw/ Rally Gauge Package
1988OldsmobileCustom Cruiser—————N/A4 Term.
1988OldsmobileCutlass Supreme—————N/A4 Term.
1988PontiacFirebird—————N/A—
1987ChevroletCamaro—————N/A—
1987ChevroletCaprice—————N/A—
1987ChevroletS10 Blazer——2.8LV6—N/Aw/ Rally Gauge Package; OE No. 10039961
1987GMCS15——2.8LV6—N/Aw/ Rally Gauge Package
1987GMCS15 Jimmy——2.8LV6—N/Aw/ Rally Gauge Package
1987Oldsmobile98—————N/A—
1987OldsmobileCustom Cruiser—————N/Aw/ Plastic Housing
1987OldsmobileCustom Cruiser—————N/A—
1987OldsmobileCutlass—————N/AFitment: Excludes vehicles with automatic temperature control.
1987OldsmobileCutlass—————N/A4 Term.
1987OldsmobileCutlass——5.0LV8—N/A—
1987OldsmobileCutlass Supreme—————N/AFitment: Excludes vehicles with automatic temperature control.
1987OldsmobileCutlass Supreme—————N/A4 Term.
1987OldsmobileDelta 88—————N/ASquare shape engine crankcase breather element.
1987OldsmobileDelta 88—FWD———N/A—
1987PontiacFirebird—————N/A—
1986BuickRegal——3.8LV6—N/A—
1986BuickRegal——5.0LV8—N/A—
1986BuickSkyhawk——2.0LL4—N/A—
1986BuickSkylark—————N/A—
1986BuickSkylark——2.5LL4—N/A—
1986BuickSkylark——3.0LV6—N/A—
1986ChevroletCamaro—————N/A—
1986ChevroletS10 Blazer——2.8LV6—N/Aw/ Rally Gauge Package; OE No. 10039961
1986GMCS15——2.8LV6—N/Aw/ Rally Gauge Package
1986GMCS15 Jimmy——2.8LV6—N/Aw/ Rally Gauge Package
1986Oldsmobile98—————N/A4 Term.
1986Oldsmobile98—————N/A—
1986OldsmobileCalais—————N/A—
1986OldsmobileCustom Cruiser—————N/Aw/ Plastic Housing
1986OldsmobileCustom Cruiser—————N/A—
1986OldsmobileCutlass—————N/AFitment: Excludes vehicles with automatic temperature control.
1986OldsmobileCutlass——5.0LV8—N/A—
1986OldsmobileCutlass Ciera—————N/A—
1986OldsmobileCutlass Salon—————N/AFitment: Excludes vehicles with automatic temperature control.
1986OldsmobileCutlass Supreme—————N/AFitment: Excludes vehicles with automatic temperature control.
1986OldsmobileDelta 88—————N/ASquare shape engine crankcase breather element.
1986OldsmobileDelta 88—————N/A—
1986OldsmobileDelta 88—FWD———N/A—
1986OldsmobileFirenza—————N/A—
1986OldsmobileToronado—————N/A4 Blade Term.
1986PontiacFirebird—————N/A—
1986PontiacGrand Am——2.5LL4—N/AOE No. 10039961
1986PontiacGrand Am——3.0LV6—N/AOE No. 10039961
1985BuickCentury—————N/A—
1985BuickLeSabre—————N/A—
1985BuickLeSabreCoupe————N/A—
1985BuickLeSabreSedan————N/A—
1985BuickRegal—————N/A—
1985BuickRiviera—————N/A—
1985BuickRiviera——3.8LV6—N/A—
1985BuickRiviera——5.0LV8—N/A—
1985BuickRiviera——5.7LV8—N/A—
1985BuickSkylark—————N/A—
1985BuickSkylark——2.5LL4—N/A—
1985BuickSkylark——2.8LV6—N/A—
1985CadillacDeVille——4.1LV8—N/A—
1985CadillacDeVille——4.3LV6—N/A—
1985CadillacFleetwood——4.3LV6—N/A—
1985ChevroletCamaro—————N/A—
1985ChevroletCaprice—————N/A—
1985ChevroletCavalier—————N/A—
1985ChevroletCelebrity——4.3LV6—N/A—
1985ChevroletCelebrity—————N/A—
1985ChevroletChevette—————N/A—
1985ChevroletCitation II—————N/ASquare Relay
1985ChevroletCorvette—————N/A4 Blade Term.
1985ChevroletCorvette—————N/A—
1985ChevroletEl Camino—————N/A—
1985ChevroletImpala—————N/A—
1985ChevroletMonte Carlo—————N/A—
1985Oldsmobile98——3.0LV6—N/A—
1985Oldsmobile98——4.3LV6—N/A—
1985Oldsmobile98——3.0LV6—N/AOE No.10022960, 10039961
1985Oldsmobile98——3.8LV6—N/AOE No.10022960, 10039961
1985Oldsmobile98——4.3LV6—N/AOE No.10022960, 10039961
1985Oldsmobile98—————N/A—
1985OldsmobileCalais—————N/A—
1985OldsmobileCustom Cruiser—————N/A—
1985OldsmobileCustom Cruiser—————N/A4 Term.
1985OldsmobileCutlass—————N/AFitment: Excludes vehicles with automatic temperature control.
1985OldsmobileCutlass—————N/A—
1985OldsmobileCutlass Ciera——4.3LV6DIESELN/A—
1985OldsmobileCutlass Ciera—————N/A—
1985OldsmobileCutlass Ciera——3.0LV6—N/AOE No.10022960, 10039961
1985OldsmobileCutlass Ciera——4.3LV6—N/AOE No.10022960, 10039961
1985OldsmobileCutlass Salon—————N/AFitment: Excludes vehicles with automatic temperature control.
1985OldsmobileCutlass Supreme—————N/AFitment: Excludes vehicles with automatic temperature control.
1985OldsmobileDelta 88——5.7LV8—N/A—
1985OldsmobileDelta 88—————N/ASquare Relay
1985OldsmobileDelta 88Sedan————N/A—
1985OldsmobileDelta 88—————N/A—
1985OldsmobileDelta 88——3.8LV6—N/A—
1985OldsmobileDelta 88——5.0LV8—N/A—
1985OldsmobileFirenza—————N/A—
1985OldsmobileToronado—————N/A—
1985Pontiac6000——2.5LL4—N/AOE No.10022960
1985Pontiac6000——2.8LV6—N/AOE No.10022960
1985Pontiac6000——4.3LV6—N/AOE No.10022960
1985Pontiac6000—————N/A—
1985PontiacBonneville—————N/A—
1985PontiacBonneville—————N/ARectangular Relay
1985PontiacFirebird—————N/ASilver
1985PontiacGrand Am—————N/A—
1985PontiacGrand Prix—————N/A—
1985PontiacParisienne—————N/A—
1985PontiacParisienne——3.8LV6—N/AOE No.10022960
1985PontiacParisienne——4.3LV6—N/AOE No.10022960
1985PontiacParisienne——5.0LV8—N/AOE No.10022960
1985PontiacParisienne——5.7LV8—N/AOE No.10022960
1984BuickCentury——4.3LV6DIESELN/A—
1984BuickCentury—————N/A—
1984BuickCentury——3.0LV6—N/A4 Blade Term.
1984BuickCentury——4.3LV6—N/A4 Blade Term.
1984BuickLeSabre—————N/A—
1984BuickRegal—————N/A—
1984BuickRegal——3.8LV6—N/A—
1984BuickRegal——4.1LV6—N/A—
1984BuickRegal——4.3LV6—N/A—
1984BuickRegal——5.0LV8—N/A—
1984BuickRiviera—————N/A—
1984BuickRiviera——5.7LV8—N/A—
1984BuickRiviera——5.0LV8—N/A—
1984CadillacDeVille——5.7LV8—N/A—
1984CadillacDeVille——4.1LV8—N/A—
1984ChevroletCaprice——5.7LV8DIESELN/A—
1984ChevroletCaprice—————N/A—
1984ChevroletCavalier—————N/A—
1984ChevroletCelebrity——2.8LV6—N/A—
1984ChevroletCelebrity——4.3LV6—N/A—
1984ChevroletCelebrity—————N/A—
1984ChevroletChevette—————N/A—
1984ChevroletCitation II—————N/A4 Term.
1984ChevroletCorvette—————N/A4 Blade Term.
1984ChevroletCorvette—————N/A—
1984ChevroletEl Camino——5.7LV8—N/A—
1984ChevroletEl Camino—————N/A4 Blade Term.
1984ChevroletEl Camino—————N/A—
1984ChevroletImpala—————N/A—
1984ChevroletMonte Carlo—————N/A—
1984ChevroletMonte Carlo—————N/A4 Blade Term.
1984Oldsmobile98——5.7LV8DIESELN/A—
1984Oldsmobile98—————N/A—
1984OldsmobileCustom Cruiser—————N/A4 Term.
1984OldsmobileCustom Cruiser——5.7LV8DIESELN/A—
1984OldsmobileCutlass Calais——5.7LV8DIESELN/A—
1984OldsmobileCutlass Calais—————N/A—
1984OldsmobileCutlass Ciera——4.3LV6DIESELN/A—
1984OldsmobileCutlass Ciera——3.0LV6—N/AOE No.10022960, 10039961
1984OldsmobileCutlass Ciera——4.3LV6—N/AOE No.10022960, 10039961
1984OldsmobileCutlass Ciera—————N/AAutomatic temperature control is needed for proper installation.
1984OldsmobileCutlass Ciera——4.3LV6DIESELN/ACompatible with vehicles equipped with High Altitude Emissions.
1984OldsmobileCutlass Supreme—————N/A—
1984OldsmobileDelta 88——5.7LV8DIESELN/A—
1984OldsmobileDelta 88Sedan————N/A—
1984OldsmobileDelta 88—————N/A—
1984OldsmobileFirenza—————N/AAutomatic temperature control is needed for proper installation.
1984OldsmobileFirenza—————N/A—
1984OldsmobileToronado——5.7LV8DIESELN/A—
1984OldsmobileToronado—————N/A—
1984Pontiac6000——4.3LV6DIESELN/Aw/ High Altitude Emissions; w/ Federal Emissions
1984Pontiac6000—————N/AAutomatic temperature control is needed for proper installation.
1984Pontiac6000—————N/A—
1984Pontiac6000——4.3LV6—N/AOE No.10022960
1984PontiacBonneville—————N/A—
1984PontiacGrand Prix—————N/A—
1984PontiacGrand Prix——5.7LV8DIESELN/Aw/ High Altitude Emissions; w/ Federal Emissions
1984PontiacParisienne—————N/A—
1983BuickCentury——2.5LL4—N/A—
1983BuickCentury——2.8LV6—N/A—
1983BuickCentury——3.0LV6—N/A—
1983BuickCentury——4.3LV6—N/A—
1983BuickCentury——3.0LV6—N/A4 Blade Term.
1983BuickCentury——4.3LV6—N/A4 Blade Term.
1983BuickLeSabre—————N/A—
1983BuickRegal—————N/A—
1983BuickRiviera—————N/A—
1983BuickRiviera——3.8LV6—N/A—
1983ChevroletCaprice—————N/A—
1983ChevroletCaprice——3.8LV6—N/A—
1983ChevroletCaprice——5.0LV8—N/A—
1983ChevroletCaprice——5.7LV8—N/A—
1983ChevroletCelebrity—————N/A—
1983ChevroletEl Camino—————N/A4 Blade Term.
1983ChevroletEl Camino——3.8LV6—N/A—
1983ChevroletEl Camino——5.0LV8—N/A—
1983ChevroletEl Camino——5.7LV8—N/A—
1983ChevroletImpala—————N/A—
1983ChevroletImpala——3.8LV6—N/A—
1983ChevroletImpala——5.0LV8—N/A—
1983ChevroletImpala——5.7LV8—N/A—
1983ChevroletMalibu—————N/A—
1983ChevroletMalibu——3.8LV6—N/A—
1983ChevroletMalibu——5.0LV8—N/A—
1983ChevroletMalibu——4.3LV6—N/A—
1983ChevroletMalibu——5.7LV8—N/A—
1983ChevroletMonte Carlo—————N/A—
1983ChevroletMonte Carlo——3.8LV6—N/A—
1983ChevroletMonte Carlo——5.0LV8—N/A—
1983ChevroletMonte Carlo——4.3LV6—N/A—
1983ChevroletMonte Carlo——5.7LV8—N/A—
1983Oldsmobile98—————N/A—
1983Oldsmobile98——5.7LV8—N/A—
1983OldsmobileCustom Cruiser—————N/AAutomatic temperature control is needed for proper installation.
1983OldsmobileCutlass Calais—————N/AAutomatic temperature control is needed for proper installation.
1983OldsmobileCutlass Ciera—————N/Aw/o Bracket; OE No. 10022960
1983OldsmobileCutlass Ciera—————N/AAutomatic temperature control is needed for proper installation.
1983OldsmobileCutlass Ciera——4.3LV6—N/A—
1983OldsmobileCutlass Cruiser—————N/AAutomatic temperature control is needed for proper installation.
1983OldsmobileCutlass Supreme—————N/AAutomatic temperature control is needed for proper installation.
1983OldsmobileDelta 88Sedan————N/A—
1983OldsmobileDelta 88—————N/A—
1983OldsmobileFirenza—————N/AAutomatic temperature control is needed for proper installation.
1983OldsmobileToronado—————N/A—
1983Pontiac6000—————N/A4 Term.
1983Pontiac6000—————N/AAutomatic temperature control is needed for proper installation.
1983Pontiac6000——4.3LV6—N/A—
1983PontiacBonneville—————N/A—
1983PontiacGrand LeMans—————N/A—
1983PontiacGrand Prix—————N/A—
1983PontiacParisienne—————N/A—
1982BuickCentury——3.0LV6—N/A—
1982BuickCentury——2.5LL4—N/A—
1982BuickCentury——2.8LV6—N/A—
1982BuickCentury——4.3LV6—N/A—
1982BuickCentury—————N/A5-blade terminal for automatic transmission spark control relay.
1982BuickLeSabre—————N/A—
1982BuickRegal—————N/A—
1982BuickRiviera—————N/A—
1982ChevroletCaprice—————N/A—
1982ChevroletCelebrity—————N/A—
1982ChevroletEl Camino—————N/A4 Blade Term.
1982ChevroletEl Camino——3.8LV6—N/A—
1982ChevroletEl Camino——4.4LV8—N/A—
1982ChevroletEl Camino——5.0LV8—N/A—
1982ChevroletImpala—————N/A—
1982ChevroletMalibu—————N/A—
1982ChevroletMonte Carlo—————N/A—
1982ChevroletMonte Carlo——3.8LV6—N/A—
1982ChevroletMonte Carlo——4.4LV8—N/A—
1982ChevroletMonte Carlo——5.0LV8—N/A—
1982ChevroletMonte Carlo——4.3LV6—N/A—
1982ChevroletMonte Carlo——5.7LV8—N/A—
1982Oldsmobile98—————N/A—
1982Oldsmobile98——5.7LV8—N/A—
1982OldsmobileCustom Cruiser—————N/AAutomatic temperature control is needed for proper installation.
1982OldsmobileCutlass Calais——3.8LV6—N/A—
1982OldsmobileCutlass Calais—————N/AAutomatic temperature control is needed for proper installation.
1982OldsmobileCutlass Ciera—————N/Aw/o Bracket; OE No. 10022960
1982OldsmobileCutlass Ciera—————N/AAutomatic temperature control is needed for proper installation.
1982OldsmobileCutlass Ciera——3.0LV6—N/ABy Right Shock Tower
1982OldsmobileCutlass Ciera——4.3LV6—N/A—
1982OldsmobileCutlass Cruiser—————N/AAutomatic temperature control is needed for proper installation.
1982OldsmobileCutlass Supreme—————N/AAutomatic temperature control is needed for proper installation.
1982OldsmobileDelta 88Sedan————N/A—
1982OldsmobileDelta 88——3.8LV6—N/A—
1982OldsmobileDelta 88——4.3LV8—N/A—
1982OldsmobileDelta 88——4.4LV8—N/A—
1982OldsmobileDelta 88——5.0LV8—N/A—
1982OldsmobileDelta 88——5.7LV8—N/A—
1982OldsmobileFirenza—————N/AAutomatic temperature control is needed for proper installation.
1982OldsmobileToronado—————N/A—
1982Pontiac6000—————N/AAutomatic temperature control is needed for proper installation.
1982Pontiac6000—————N/A—
1982Pontiac6000——4.3LV6—N/A—
1982PontiacBonneville—————N/A—
1982PontiacGrand LeMans—————N/A—
1982PontiacGrand Prix—————N/A—
1982PontiacParisienne—————N/A—
1981Oldsmobile98——5.7LV8—N/A—
1980Oldsmobile98——5.7LV8—N/A—
Directly replaces or cross-references 11 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 359151R125756-1721198711002095010039961AR212AR220MT0525R675RAA1857