Product Overview

This used HVAC control unit is designed for manual climate systems in the Peugeot 307. It operates the heater and manual air conditioning functions: temperature selection, fan speed, air distribution and AC on/off. Frequently searched by product codes 593240000, T5RFESS, 6451JS and 6451JR, this component is a common replacement on older 307s and is aimed at professional mechanics and DIY enthusiasts who perform electrical and interior repairs.

Key Benefits

• Direct replacement for original manual climate controls on compatible Peugeot 307 models.
• Restores full manual HVAC functionality: blower control, temperature regulation and mode selection.
• Fits into original dash location, simple swap for experienced technicians.

Technical Information

• Manufacturer: Stellantis / Peugeot
• Model: Peugeot 307
• Product Codes: 593240000, T5RFESS, 6451JS, 6451JR
• Additional Numbers: NFP

Compatibility And Fitment

Intended for Peugeot 307 models. This control is commonly fitted to first generation 307 vehicles and may appear across hatchback, SW (estate) and CC (coupe-cabriolet) body types depending on production year and equipment level. Always verify the product codes stamped on the unit (listed above) against the vehicle unit before installation to ensure correct fitment.

How The Unit Is Replaced

Replacement requires basic trim removal and careful handling of electrical connectors. Typical procedure:

1. Disconnect the negative battery terminal before any work to avoid short circuits and prevent damage to electronic modules.
2. Remove surrounding dash trim and radio bezel using appropriate plastic trim tools to avoid scratching panels.
3. Unscrew the HVAC control unit fasteners (commonly Phillips or Torx) and gently pull the unit forward.
4. Disconnect electrical connector(s) and any mechanical linkages (if applicable), then remove the unit.
5. Install the replacement by reversing removal steps: connect wiring, secure fasteners, test all HVAC functions (fan speeds, temperature control, air distribution, AC engage) before refitting trim and reconnecting the battery.

Installation Recommendations

• Always disconnect the battery before removal/installation.
• Use plastic trim tools to avoid damaging clips and fascia surfaces.
• Inspect the connector and wiring harness for corrosion, bent pins or brittle insulation; repair any damaged wiring before fitting the new unit.
• Test the unit’s functions (fan speeds, temperature response, mode selection, AC signal) with the battery connected before completing reassembly.

Why The Part Most Commonly Fails

• Wear On Electrical Contacts And Potentiometers: Repeated use of knobs and sliders causes wear or intermittent contact.
• Corrosion And Moisture Ingress: Water leaks or high humidity can corrode PCB traces and connector pins.
• Broken Knobs Or Mechanical Components: Physical damage to controls or internal levers prevents proper operation.
• Cold/Heat Cycling And Age: Thermal stress over many years can cause cracked solder joints or degraded electronic components.
• Faulty Connectors Or Wiring: Oxidised connectors or damaged wiring can create intermittent faults that mimic unit failure.

Practical Tips For Mechanics And DIYers

• If symptoms are intermittent, inspect connectors and wiring before replacing the entire unit — a corroded pin or loose connector is often the root cause.
• Keep replacement fasteners and trim clips handy; some clips become brittle with age and should be replaced to ensure a clean reassembly.
• Label connectors during disassembly to avoid mix-ups when reinstalling similar plugs behind the dash.

Final Notes

This is a used component intended to restore manual climate functionality on compatible Peugeot 307 vehicles. Check product codes (593240000 / T5RFESS / 6451JS / 6451JR) against the unit fitted in the vehicle to confirm compatibility prior to installation.