Four Seasons 35987 HVAC Relay

HVAC Relay for Ford and Mercury Applications

Four Seasons Relay 35987 is a 12-volt standard HVAC relay built with a 5-blade terminal layout, square female connector, and 30-amp amperage rating. It is a black, skirted relay with a single connector and a male terminal design, made to meet or exceed OEM requirements for direct replacement service.

Compatible With Ford Mustang, Ford Taurus, Ford Tempo, Ford Thunderbird, Mercury Cougar, and other listed Ford and Mercury vehicles, this relay supports HVAC and cooling-related electrical control functions where the original relay has failed. Four Seasons Relay 35987 is part of the Relay line, a standard relay product line focused on OE-style electrical switching for automotive systems.

Key Features

• 12-volt standard relay for automotive HVAC and related control circuits
• 30-amp amperage rating for common relay applications
• 5 blade terminals with a square female connector
• Skirted black housing, w/o bracket
• Meets or exceeds OEM specifications
• Direct replacement style for Ford and Mercury fitments

Detailed Description

Four Seasons 35987 is an HVAC relay designed for vehicles that use a standard 12V, 5-terminal relay configuration. The relay’s blade terminals, square connector shape, and skirted housing support a secure electrical interface in factory-style relay sockets. This part is listed for a wide range of Ford and Mercury models, including 1986-1989 Ford Mustang, 1986-1989 Ford Taurus, 1984-1989 Ford Tempo, 1983-1989 Ford Thunderbird, 1982-1989 Mercury Cougar, and 1986-1989 Mercury Sable. It also cross-references Gates 19887 for the same application.

As a Four Seasons Relay line component, part number 35987 is intended for standard relay replacement where consistent switching performance is required in HVAC and engine-cooling related circuits. The OE-style design helps maintain proper electrical control in vehicles such as Ford Escort, Ford LTD Crown Victoria, Mercury Grand Marquis, and Mercury Topaz.

What It Helps Fix

• Intermittent or inoperative HVAC relay operation
• A/C compressor cut-out relay failure on listed Ford applications
• Engine cooling fan relay electrical switching problems
• Relay-related blower or control circuit interruptions
• Heat-related relay contact wear or electrical inconsistency

Installation Notes and Tips

• Verify the relay socket matches the 5-blade terminal layout and square connector shape before installation.
• Confirm the vehicle uses a 12-volt standard relay with a 30-amp rating.
• Check the original relay’s connector style, terminal count, and skirted housing for proper match.
• Use the vehicle’s service information to confirm the exact relay location and circuit function.
• Fits 1986-1989 Ford Mustang, N/A; 1986-1989 Ford Taurus, N/A; 1983-1989 Ford Thunderbird, N/A; 1982-1989 Mercury Cougar, N/A; and other listed Ford and Mercury applications.

Quality Assurance

Four Seasons lists this relay as meeting or exceeding OEM requirements, supporting direct replacement use in factory-style electrical systems. Part number 35987 is engineered for standard automotive relay service across the listed Ford and Mercury applications.