Standard Ignition AX333 HVAC Heater Core Temperature Sensor

HVAC Heater Core Temperature Sensor for Ford Escape

Standard Ignition AX333 is a direct-fit HVAC heater core temperature sensor for vehicles that rely on accurate coolant temperature feedback to manage heater and fan operation. It restores the temperature signal from the heater core and is built with a high-temperature housing for demanding underhood conditions.

Compatible with 2008-2012 Ford Escape and 2008-2011 Mercury Mariner, this sensor is a practical OE-style replacement when the original unit is damaged or no longer reading correctly. Standard Ignition AX333 is also cross-referenced with 5S9075 for the same application.

Key Features

• Direct-fit replacement for the heater core temperature sensor
• Female connector with 1 plug-in connection
• 2-pin terminal design with male pin terminals
• High-temperature housing for harsh engine bay conditions
• Supports accurate temperature input for HVAC control logic
• Built for electrical performance and long service life

Detailed Description

Standard Ignition AX333 is an HVAC heater core temperature sensor engineered to replace damaged OE units and restore proper coolant temperature signaling from the heater core. The sensor provides the temperature input used alongside ambient air, sun load, and cabin temperature sensors to help the HVAC system regulate heater and fan operation. For Ford Escape and Mercury Mariner applications, AX333 offers a direct-fit solution that matches the required 2-pin configuration.

Standard Ignition AX333 is a fitment-based replacement for 2008-2012 Ford Escape and 2008-2011 Mercury Mariner models. If you are searching for a Ford Escape heater core temperature sensor or a Mercury Mariner HVAC temperature sensor, this part number is a direct reference point for the correct application.

What It Helps Address

• Incorrect heater output caused by a failed temperature sensor
• HVAC fan behavior that does not match cabin temperature demand
• Loss of coolant temperature signal from the heater core
• Faulty OE sensor readings in Ford Escape and Mercury Mariner models
• Electrical issues related to a worn or damaged 2-pin sensor connection

Installation Notes and Tips

Verify the connector style, terminal count, and vehicle application before installation. AX333 uses a female plug-in connector with 2 male pin terminals, so the replacement should match the original sensor connection exactly. Inspect the harness and connector for corrosion, heat damage, or bent terminals before installing the new sensor.

For best results, confirm the vehicle year and model against the listed fitment: Fits 2008-2012 Ford Escape, N/A; Fits 2008-2011 Mercury Mariner, N/A. This part number, AX333, is commonly searched for Ford Escape heater core temperature sensor replacement and Mercury Mariner HVAC sensor service.

Quality Assurance

Standard Ignition designs this sensor with durable materials and a high-temperature housing to meet the demands of modern service work. The construction is intended to deliver stable electrical performance and consistent temperature readings in demanding operating conditions.