Standard Ignition RY-1086 HVAC Automatic Temperature Control (ATC) Relay

HVAC Automatic Temperature Control Relay for Mercedes-Benz

Standard Ignition RY-1086 is a 12-volt HVAC automatic temperature control relay built for Mercedes-Benz applications that use a 4-terminal, male spade connection. With a 70 amp amperage rating and ABS function listing, it supports electrical switching needs in the vehicle’s control system while matching OE-style fitment requirements.

Use this relay when you need a direct replacement for Mercedes-Benz HVAC relay applications, including select CLA250, GLA250, GLB250, Sprinter, GLC300, S-Class, and ML-Class models. The Standard Ignition RY-1086 is also cross-referenced to Carlson 16174 for the same application.

Key Features

• 12-volt HVAC automatic temperature control relay
• 70 amp amperage rating for high-current switching
• 4-terminal male spade design
• Relay contents only
• Fits select Mercedes-Benz, Dodge Sprinter, and related OE-numbered applications
• Part number: RY-1086

Detailed Description

Standard Ignition RY-1086 is an HVAC relay used in a wide range of Mercedes-Benz vehicles, including 2014-2025 Mercedes-Benz CLA250, 2021-2025 Mercedes-Benz GLA250, 2020-2025 Mercedes-Benz GLB250, 2010-2024 Mercedes-Benz Sprinter 2500, and 2016-2022 Mercedes-Benz GLC300. It also covers older Mercedes-Benz models such as ML320, ML350, ML550, ML63 AMG, C230, C240, C320, and C55 AMG where the OE relay specification calls for this configuration.

This relay is a practical replacement for HVAC relay service on Mercedes-Benz vehicles that require a 12V, 70A, 4-terminal spade unit. Part number RY-1086 is a direct reference point for technicians and parts buyers searching for Mercedes-Benz HVAC relay replacement, Mercedes-Benz Sprinter instrument panel mounted relay, or OE-style relay service for select ABS-related electrical circuits.

What It Helps Address

• HVAC relay failure causing intermittent climate control operation
• Noisy, sticking, or non-responsive relay switching
• Electrical control issues in relay-fed circuits
• Replacement needs for OE-numbered Mercedes-Benz relay applications
• Service on instrument panel mounted Sprinter relay locations

Installation Notes and Tips

• Verify terminal count, terminal gender, and spade style before installation.
• Confirm the vehicle’s OE relay number and connector layout match RY-1086.
• Check the mounting location, especially on Sprinter 1500, 2500, 3500, and 3500XD models with instrument panel mounted applications.
• Inspect the relay socket for heat damage, corrosion, or loose terminals before installing the replacement.

Quality Assurance

Standard Ignition supplies this relay as an OE-style replacement part for the listed applications. The part number RY-1086 is supported by interchange references including Carlson 16174 and OE cross-references used in Mercedes-Benz relay service.