HomeStandard Ignition RY-228 HVAC Automatic Temperature Control (ATC) Relay
Part #: RY-228

Standard Ignition RY-228 HVAC Automatic Temperature Control (ATC) Relay

93 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$38.39Free Shipping
Free ShippingNo Cost to Continental U.S.
Free Returns*Wrong fit? No cost
60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
Out of Stock
OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Isuzu, Geo, and Chevrolet, Pickup, Spectrum, I-Mark, Impulse, and Trooper
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Standard Ignition HVAC Automatic Temperature Control Relay

The Standard Ignition RY-228 HVAC Automatic Temperature Control (ATC) Relay is designed to provide reliable relay functions for your vehicle's climate control system. This relay is compatible with select Chevrolet, Geo, and Isuzu models, ensuring proper operation of the HVAC system.

  • Compatible with Chevrolet I-Mark, Geo Spectrum, Geo Impulse, Isuzu Pickup, and Isuzu Trooper
  • 12-volt relay with 4 male blade terminals
  • Square connector shape for secure fitment
  • Includes relay only; mounting bracket not included
  • Designed for HVAC Automatic Temperature Control (ATC) systems

Technical Details and Specifications

The RY-228 relay operates at 12 volts and features four male blade terminals arranged in a square connector shape, providing a secure and reliable electrical connection. This relay is not rated for continuous duty but is engineered specifically for HVAC Automatic Temperature Control applications. The relay's blade terminal type and quantity ensure compatibility with the original equipment wiring harnesses found in Chevrolet I-Mark, Geo Impulse, Geo Spectrum, Isuzu Pickup, and Isuzu Trooper models. Note that this product does not include a mounting bracket, so installation will require using the existing bracket or an alternative mounting solution.

Applications and Common Issues Addressed

  • Restores proper function to HVAC automatic temperature control systems in Chevrolet I-Mark and Geo Spectrum vehicles
  • Resolves intermittent or non-functioning HVAC relay issues in Geo Impulse and Isuzu Pickup models
  • Addresses relay failure symptoms such as inconsistent climate control operation in Isuzu Trooper
  • Helps maintain electrical circuit integrity within the HVAC system

Installation Notes and Tips

  • Verify vehicle compatibility with Chevrolet I-Mark, Geo Impulse, Geo Spectrum, Isuzu Pickup, or Isuzu Trooper before installation
  • Ensure the relay terminals align correctly with the vehicle’s wiring harness connector
  • Use existing mounting bracket or secure relay in a suitable location as mounting bracket is not included
  • Disconnect the battery before installation to prevent electrical shorts

Quality Assurance and Warranty Information

Standard Ignition parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The RY-228 HVAC Automatic Temperature Control Relay undergoes rigorous quality control to ensure reliable performance in compatible Chevrolet, Geo, and Isuzu vehicles. Warranty coverage details should be confirmed with the point of purchase or Standard Ignition documentation.

BrandStandard Ignition
Part NumberRY-228
Connector ShapeSquare
ContentsRelay
Continuous DutyNo
FunctionsRelay
Mounting Bracket(s) IncludedNo
Terminal GenderMale
Terminal TypeBlade
Voltage12

This part fits 93 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
1990IsuzuPickupN/A4 Blade Term.
1989GeoSpectrumN/A
1989IsuzuI-MarkN/A4 Blade Term.
1989IsuzuI-MarkN/A
1989IsuzuPickupN/A4 Blade Term.
1988ChevroletSpectrumN/A
1988ChevroletSpectrumN/AOE No. 94248989
1988IsuzuI-MarkN/A4 Blade Term.
1988IsuzuI-MarkN/A
1988IsuzuI-MarkN/AOE No. 8-94248-989-0; 4 Blade Term.
1988IsuzuImpulseN/A4 Blade Term.
1988IsuzuImpulseN/A
1988IsuzuImpulseN/AOE No. 8-94248-989-0; 4 Blade Term.
1988IsuzuPickupN/A4 Blade Term.
1988IsuzuPickupN/A
1988IsuzuPickupN/AOE No. 8-94248-989-0; 4 Blade Term.
1988IsuzuTrooperN/A4 Blade Term.
1988IsuzuTrooperN/A
1988IsuzuTrooperN/AOE No. 8-94248-989-0; 4 Blade Term.
1988IsuzuTrooperN/AFits without skirt
1987ChevroletSpectrumN/A
1987ChevroletSpectrumN/AOE No. 94248989
1987IsuzuI-MarkN/A4 Blade Term.
1987IsuzuI-MarkN/A
1987IsuzuI-MarkN/AOE No. 8-94248-989-0; 4 Blade Term.
1987IsuzuImpulseN/A4 Blade Term.
1987IsuzuImpulseN/A
1987IsuzuImpulseN/AOE No. 8-94248-989-0; 4 Blade Term.
1987IsuzuImpulse1.9LL4N/A
1987IsuzuPickupN/A4 Blade Term.
1987IsuzuPickupGASN/A
1987IsuzuPickupN/AOE No. 8-94248-989-0; 4 Blade Term.
1987IsuzuTrooperN/A4 Blade Term.
1987IsuzuTrooperN/A
1987IsuzuTrooperN/AFits without skirt
1987IsuzuTrooperN/AOE No. 8-94248-989-0; 4 Blade Term.
1986ChevroletSpectrumN/A
1986ChevroletSpectrumN/AOE No. 94248989
1986IsuzuI-MarkN/A4 Blade Term.
1986IsuzuI-MarkN/A
1986IsuzuI-MarkN/AOE No. 8-94248-989-0; 4 Blade Term.
1986IsuzuImpulseN/A4 Blade Term.
1986IsuzuImpulseN/A
1986IsuzuImpulseN/AOE No. 8-94248-989-0; 4 Blade Term.
1986IsuzuImpulse1.9LL4N/A
1986IsuzuPickupN/A4 Blade Term.
1986IsuzuPickupGASN/AFits vehicles equipped with California emissions.
1986IsuzuPickupN/AOE No. 8-94248-989-0; 4 Blade Term.
1986IsuzuTrooperN/A4 Blade Term.
1986IsuzuTrooperN/A
1986IsuzuTrooperN/A4 Term.
1986IsuzuTrooperN/AOE No. 8-94248-989-0; 4 Blade Term.
1985ChevroletSpectrumN/A
1985ChevroletSpectrumN/AOE No. 94248989
1985IsuzuI-MarkN/A4 Blade Term.
1985IsuzuI-MarkN/A
1985IsuzuI-MarkN/AOE No. 8-94248-989-0; 4 Blade Term.
1985IsuzuImpulseN/A4 Blade Term.
1985IsuzuImpulseN/A
1985IsuzuImpulseN/AOE No. 8-94248-989-0; 4 Blade Term.
1985IsuzuImpulse1.9LL4N/A
1985IsuzuPickupN/A4 Blade Term.
1985IsuzuPickupGASN/AFits vehicles equipped with California emissions.
1985IsuzuPickupN/AOE No. 8-94248-989-0; 4 Blade Term.
1985IsuzuTrooperN/A4 Blade Term.
1985IsuzuTrooperN/A
1985IsuzuTrooperN/A4 Term.
1985IsuzuTrooperN/AOE No. 8-94248-989-0; 4 Blade Term.
1984IsuzuI-MarkN/A4 Blade Term.
1984IsuzuI-MarkN/A
1984IsuzuI-MarkN/AOE No. 8-94248-989-0; 4 Blade Term.
1984IsuzuImpulseN/A4 Blade Term.
1984IsuzuImpulseN/A
1984IsuzuImpulseN/AOE No. 8-94248-989-0; 4 Blade Term.
1984IsuzuPickupN/A4 Blade Term.
1984IsuzuPickupN/AOE No. 8-94248-989-0; 4 Blade Term.
1984IsuzuTrooperN/A4 Blade Term.
1984IsuzuTrooperN/A4 Term.
1984IsuzuTrooperN/AOE No. 8-94248-989-0; 4 Blade Term.
1983IsuzuI-MarkN/A4 Blade Term.
1983IsuzuI-MarkN/A
1983IsuzuI-MarkN/AOE No. 8-94248-989-0; 4 Blade Term.
1983IsuzuImpulseN/A4 Blade Term.
1983IsuzuImpulseN/A
1983IsuzuImpulseN/AOE No. 8-94248-989-0; 4 Blade Term.
1983IsuzuPickupN/A4 Blade Term.
1983IsuzuPickupN/AOE No. 8-94248-989-0; 4 Blade Term.
1982IsuzuI-MarkN/A4 Blade Term.
1982IsuzuI-MarkN/A
1982IsuzuI-MarkN/AOE No. 8-94248-989-0; 4 Blade Term.
1982IsuzuPickupN/A4 Blade Term.
1982IsuzuPickupN/AOE No. 8-94248-989-0; 4 Blade Term.
1981IsuzuI-MarkN/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

193301R1100203-00893602656-159189057580894248989094248989AR377AR457R4139RAA1605

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.