Standard Ignition

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 CruiserN/A
1992OldsmobileCutlass CieraN/A
1991OldsmobileCustom CruiserN/A
1991OldsmobileCutlass CieraN/A
1990ChevroletCorvetteN/A
1990OldsmobileCustom CruiserN/A
1989OldsmobileCustom CruiserN/A
1988ChevroletCorvetteN/A
1988ChevroletS104.3LV6N/A
1988ChevroletS10 Blazer4.3LV6N/Aw/ Rally Gauge Package; OE No. 10039961
1988ChevroletS10 Blazer2.8LV6N/Aw/ Rally Gauge Package; OE No. 10039961
1988GMCS154.3LV6N/Aw/ Rally Gauge Package
1988GMCS152.8LV6N/Aw/ Rally Gauge Package
1988GMCS15 Jimmy4.3LV6N/Aw/ Rally Gauge Package
1988GMCS15 Jimmy2.8LV6N/Aw/ Rally Gauge Package
1988OldsmobileCustom CruiserN/A4 Term.
1988OldsmobileCutlass SupremeN/A4 Term.
1988PontiacFirebirdN/A
1987ChevroletCamaroN/A
1987ChevroletCapriceN/A
1987ChevroletS10 Blazer2.8LV6N/Aw/ Rally Gauge Package; OE No. 10039961
1987GMCS152.8LV6N/Aw/ Rally Gauge Package
1987GMCS15 Jimmy2.8LV6N/Aw/ Rally Gauge Package
1987Oldsmobile98N/A
1987OldsmobileCustom CruiserN/Aw/ Plastic Housing
1987OldsmobileCustom CruiserN/A
1987OldsmobileCutlassN/AFitment: Excludes vehicles with automatic temperature control.
1987OldsmobileCutlassN/A4 Term.
1987OldsmobileCutlass5.0LV8N/A
1987OldsmobileCutlass SupremeN/AFitment: Excludes vehicles with automatic temperature control.
1987OldsmobileCutlass SupremeN/A4 Term.
1987OldsmobileDelta 88N/ASquare shape engine crankcase breather element.
1987OldsmobileDelta 88FWDN/A
1987PontiacFirebirdN/A
1986BuickRegal3.8LV6N/A
1986BuickRegal5.0LV8N/A
1986BuickSkyhawk2.0LL4N/A
1986BuickSkylarkN/A
1986BuickSkylark2.5LL4N/A
1986BuickSkylark3.0LV6N/A
1986ChevroletCamaroN/A
1986ChevroletS10 Blazer2.8LV6N/Aw/ Rally Gauge Package; OE No. 10039961
1986GMCS152.8LV6N/Aw/ Rally Gauge Package
1986GMCS15 Jimmy2.8LV6N/Aw/ Rally Gauge Package
1986Oldsmobile98N/A4 Term.
1986Oldsmobile98N/A
1986OldsmobileCalaisN/A
1986OldsmobileCustom CruiserN/Aw/ Plastic Housing
1986OldsmobileCustom CruiserN/A
1986OldsmobileCutlassN/AFitment: Excludes vehicles with automatic temperature control.
1986OldsmobileCutlass5.0LV8N/A
1986OldsmobileCutlass CieraN/A
1986OldsmobileCutlass SalonN/AFitment: Excludes vehicles with automatic temperature control.
1986OldsmobileCutlass SupremeN/AFitment: Excludes vehicles with automatic temperature control.
1986OldsmobileDelta 88N/ASquare shape engine crankcase breather element.
1986OldsmobileDelta 88N/A
1986OldsmobileDelta 88FWDN/A
1986OldsmobileFirenzaN/A
1986OldsmobileToronadoN/A4 Blade Term.
1986PontiacFirebirdN/A
1986PontiacGrand Am2.5LL4N/AOE No. 10039961
1986PontiacGrand Am3.0LV6N/AOE No. 10039961
1985BuickCenturyN/A
1985BuickLeSabreN/A
1985BuickLeSabreCoupeN/A
1985BuickLeSabreSedanN/A
1985BuickRegalN/A
1985BuickRivieraN/A
1985BuickRiviera3.8LV6N/A
1985BuickRiviera5.0LV8N/A
1985BuickRiviera5.7LV8N/A
1985BuickSkylarkN/A
1985BuickSkylark2.5LL4N/A
1985BuickSkylark2.8LV6N/A
1985CadillacDeVille4.1LV8N/A
1985CadillacDeVille4.3LV6N/A
1985CadillacFleetwood4.3LV6N/A
1985ChevroletCamaroN/A
1985ChevroletCapriceN/A
1985ChevroletCavalierN/A
1985ChevroletCelebrity4.3LV6N/A
1985ChevroletCelebrityN/A
1985ChevroletChevetteN/A
1985ChevroletCitation IIN/ASquare Relay
1985ChevroletCorvetteN/A4 Blade Term.
1985ChevroletCorvetteN/A
1985ChevroletEl CaminoN/A
1985ChevroletImpalaN/A
1985ChevroletMonte CarloN/A
1985Oldsmobile983.0LV6N/A
1985Oldsmobile984.3LV6N/A
1985Oldsmobile983.0LV6N/AOE No.10022960, 10039961
1985Oldsmobile983.8LV6N/AOE No.10022960, 10039961
1985Oldsmobile984.3LV6N/AOE No.10022960, 10039961
1985Oldsmobile98N/A
1985OldsmobileCalaisN/A
1985OldsmobileCustom CruiserN/A
1985OldsmobileCustom CruiserN/A4 Term.
1985OldsmobileCutlassN/AFitment: Excludes vehicles with automatic temperature control.
1985OldsmobileCutlassN/A
1985OldsmobileCutlass Ciera4.3LV6DIESELN/A
1985OldsmobileCutlass CieraN/A
1985OldsmobileCutlass Ciera3.0LV6N/AOE No.10022960, 10039961
1985OldsmobileCutlass Ciera4.3LV6N/AOE No.10022960, 10039961
1985OldsmobileCutlass SalonN/AFitment: Excludes vehicles with automatic temperature control.
1985OldsmobileCutlass SupremeN/AFitment: Excludes vehicles with automatic temperature control.
1985OldsmobileDelta 885.7LV8N/A
1985OldsmobileDelta 88N/ASquare Relay
1985OldsmobileDelta 88SedanN/A
1985OldsmobileDelta 88N/A
1985OldsmobileDelta 883.8LV6N/A
1985OldsmobileDelta 885.0LV8N/A
1985OldsmobileFirenzaN/A
1985OldsmobileToronadoN/A
1985Pontiac60002.5LL4N/AOE No.10022960
1985Pontiac60002.8LV6N/AOE No.10022960
1985Pontiac60004.3LV6N/AOE No.10022960
1985Pontiac6000N/A
1985PontiacBonnevilleN/A
1985PontiacBonnevilleN/ARectangular Relay
1985PontiacFirebirdN/ASilver
1985PontiacGrand AmN/A
1985PontiacGrand PrixN/A
1985PontiacParisienneN/A
1985PontiacParisienne3.8LV6N/AOE No.10022960
1985PontiacParisienne4.3LV6N/AOE No.10022960
1985PontiacParisienne5.0LV8N/AOE No.10022960
1985PontiacParisienne5.7LV8N/AOE No.10022960
1984BuickCentury4.3LV6DIESELN/A
1984BuickCenturyN/A
1984BuickCentury3.0LV6N/A4 Blade Term.
1984BuickCentury4.3LV6N/A4 Blade Term.
1984BuickLeSabreN/A
1984BuickRegalN/A
1984BuickRegal3.8LV6N/A
1984BuickRegal4.1LV6N/A
1984BuickRegal4.3LV6N/A
1984BuickRegal5.0LV8N/A
1984BuickRivieraN/A
1984BuickRiviera5.7LV8N/A
1984BuickRiviera5.0LV8N/A
1984CadillacDeVille5.7LV8N/A
1984CadillacDeVille4.1LV8N/A
1984ChevroletCaprice5.7LV8DIESELN/A
1984ChevroletCapriceN/A
1984ChevroletCavalierN/A
1984ChevroletCelebrity2.8LV6N/A
1984ChevroletCelebrity4.3LV6N/A
1984ChevroletCelebrityN/A
1984ChevroletChevetteN/A
1984ChevroletCitation IIN/A4 Term.
1984ChevroletCorvetteN/A4 Blade Term.
1984ChevroletCorvetteN/A
1984ChevroletEl Camino5.7LV8N/A
1984ChevroletEl CaminoN/A4 Blade Term.
1984ChevroletEl CaminoN/A
1984ChevroletImpalaN/A
1984ChevroletMonte CarloN/A
1984ChevroletMonte CarloN/A4 Blade Term.
1984Oldsmobile985.7LV8DIESELN/A
1984Oldsmobile98N/A
1984OldsmobileCustom CruiserN/A4 Term.
1984OldsmobileCustom Cruiser5.7LV8DIESELN/A
1984OldsmobileCutlass Calais5.7LV8DIESELN/A
1984OldsmobileCutlass CalaisN/A
1984OldsmobileCutlass Ciera4.3LV6DIESELN/A
1984OldsmobileCutlass Ciera3.0LV6N/AOE No.10022960, 10039961
1984OldsmobileCutlass Ciera4.3LV6N/AOE No.10022960, 10039961
1984OldsmobileCutlass CieraN/AAutomatic temperature control is needed for proper installation.
1984OldsmobileCutlass Ciera4.3LV6DIESELN/ACompatible with vehicles equipped with High Altitude Emissions.
1984OldsmobileCutlass SupremeN/A
1984OldsmobileDelta 885.7LV8DIESELN/A
1984OldsmobileDelta 88SedanN/A
1984OldsmobileDelta 88N/A
1984OldsmobileFirenzaN/AAutomatic temperature control is needed for proper installation.
1984OldsmobileFirenzaN/A
1984OldsmobileToronado5.7LV8DIESELN/A
1984OldsmobileToronadoN/A
1984Pontiac60004.3LV6DIESELN/Aw/ High Altitude Emissions; w/ Federal Emissions
1984Pontiac6000N/AAutomatic temperature control is needed for proper installation.
1984Pontiac6000N/A
1984Pontiac60004.3LV6N/AOE No.10022960
1984PontiacBonnevilleN/A
1984PontiacGrand PrixN/A
1984PontiacGrand Prix5.7LV8DIESELN/Aw/ High Altitude Emissions; w/ Federal Emissions
1984PontiacParisienneN/A
1983BuickCentury2.5LL4N/A
1983BuickCentury2.8LV6N/A
1983BuickCentury3.0LV6N/A
1983BuickCentury4.3LV6N/A
1983BuickCentury3.0LV6N/A4 Blade Term.
1983BuickCentury4.3LV6N/A4 Blade Term.
1983BuickLeSabreN/A
1983BuickRegalN/A
1983BuickRivieraN/A
1983BuickRiviera3.8LV6N/A
1983ChevroletCapriceN/A
1983ChevroletCaprice3.8LV6N/A
1983ChevroletCaprice5.0LV8N/A
1983ChevroletCaprice5.7LV8N/A
1983ChevroletCelebrityN/A
1983ChevroletEl CaminoN/A4 Blade Term.
1983ChevroletEl Camino3.8LV6N/A
1983ChevroletEl Camino5.0LV8N/A
1983ChevroletEl Camino5.7LV8N/A
1983ChevroletImpalaN/A
1983ChevroletImpala3.8LV6N/A
1983ChevroletImpala5.0LV8N/A
1983ChevroletImpala5.7LV8N/A
1983ChevroletMalibuN/A
1983ChevroletMalibu3.8LV6N/A
1983ChevroletMalibu5.0LV8N/A
1983ChevroletMalibu4.3LV6N/A
1983ChevroletMalibu5.7LV8N/A
1983ChevroletMonte CarloN/A
1983ChevroletMonte Carlo3.8LV6N/A
1983ChevroletMonte Carlo5.0LV8N/A
1983ChevroletMonte Carlo4.3LV6N/A
1983ChevroletMonte Carlo5.7LV8N/A
1983Oldsmobile98N/A
1983Oldsmobile985.7LV8N/A
1983OldsmobileCustom CruiserN/AAutomatic temperature control is needed for proper installation.
1983OldsmobileCutlass CalaisN/AAutomatic temperature control is needed for proper installation.
1983OldsmobileCutlass CieraN/Aw/o Bracket; OE No. 10022960
1983OldsmobileCutlass CieraN/AAutomatic temperature control is needed for proper installation.
1983OldsmobileCutlass Ciera4.3LV6N/A
1983OldsmobileCutlass CruiserN/AAutomatic temperature control is needed for proper installation.
1983OldsmobileCutlass SupremeN/AAutomatic temperature control is needed for proper installation.
1983OldsmobileDelta 88SedanN/A
1983OldsmobileDelta 88N/A
1983OldsmobileFirenzaN/AAutomatic temperature control is needed for proper installation.
1983OldsmobileToronadoN/A
1983Pontiac6000N/A4 Term.
1983Pontiac6000N/AAutomatic temperature control is needed for proper installation.
1983Pontiac60004.3LV6N/A
1983PontiacBonnevilleN/A
1983PontiacGrand LeMansN/A
1983PontiacGrand PrixN/A
1983PontiacParisienneN/A
1982BuickCentury3.0LV6N/A
1982BuickCentury2.5LL4N/A
1982BuickCentury2.8LV6N/A
1982BuickCentury4.3LV6N/A
1982BuickCenturyN/A5-blade terminal for automatic transmission spark control relay.
1982BuickLeSabreN/A
1982BuickRegalN/A
1982BuickRivieraN/A
1982ChevroletCapriceN/A
1982ChevroletCelebrityN/A
1982ChevroletEl CaminoN/A4 Blade Term.
1982ChevroletEl Camino3.8LV6N/A
1982ChevroletEl Camino4.4LV8N/A
1982ChevroletEl Camino5.0LV8N/A
1982ChevroletImpalaN/A
1982ChevroletMalibuN/A
1982ChevroletMonte CarloN/A
1982ChevroletMonte Carlo3.8LV6N/A
1982ChevroletMonte Carlo4.4LV8N/A
1982ChevroletMonte Carlo5.0LV8N/A
1982ChevroletMonte Carlo4.3LV6N/A
1982ChevroletMonte Carlo5.7LV8N/A
1982Oldsmobile98N/A
1982Oldsmobile985.7LV8N/A
1982OldsmobileCustom CruiserN/AAutomatic temperature control is needed for proper installation.
1982OldsmobileCutlass Calais3.8LV6N/A
1982OldsmobileCutlass CalaisN/AAutomatic temperature control is needed for proper installation.
1982OldsmobileCutlass CieraN/Aw/o Bracket; OE No. 10022960
1982OldsmobileCutlass CieraN/AAutomatic temperature control is needed for proper installation.
1982OldsmobileCutlass Ciera3.0LV6N/ABy Right Shock Tower
1982OldsmobileCutlass Ciera4.3LV6N/A
1982OldsmobileCutlass CruiserN/AAutomatic temperature control is needed for proper installation.
1982OldsmobileCutlass SupremeN/AAutomatic temperature control is needed for proper installation.
1982OldsmobileDelta 88SedanN/A
1982OldsmobileDelta 883.8LV6N/A
1982OldsmobileDelta 884.3LV8N/A
1982OldsmobileDelta 884.4LV8N/A
1982OldsmobileDelta 885.0LV8N/A
1982OldsmobileDelta 885.7LV8N/A
1982OldsmobileFirenzaN/AAutomatic temperature control is needed for proper installation.
1982OldsmobileToronadoN/A
1982Pontiac6000N/AAutomatic temperature control is needed for proper installation.
1982Pontiac6000N/A
1982Pontiac60004.3LV6N/A
1982PontiacBonnevilleN/A
1982PontiacGrand LeMansN/A
1982PontiacGrand PrixN/A
1982PontiacParisienneN/A
1981Oldsmobile985.7LV8N/A
1980Oldsmobile985.7LV8N/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