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G1 Heater Matrix

This replacement heater matrix restores the interior heating system on all Mk1 Golf models, including the Cabriolet, as well as the Caddy Mk1, Scirocco, Jetta, and early Porsche 924/944 models that share the same heater box design.

A failing heater matrix is one of the most common causes of coolant leaking into the footwell, accompanied by misty windows, a sweet smell inside the cabin, or weak cabin heating. Replacing the matrix prevents further coolant loss, protects carpets and interior trim, and ensures efficient demisting and warm airflow.

Manufactured to OE-style specification, this heater matrix installs directly into the original heater box with no modifications. Ideal for restoration projects or routine maintenance on vehicles now several decades old.

Key Features

  • Direct replacement heater matrix for Mk1 platform vehicles

  • Fixes coolant leaks inside the cabin

  • Restores proper heating and demisting performance

  • OE-style construction for correct fit and reliability

  • Essential replacement for ageing or leaking original units

Vehicle Compatibility

Volkswagen:

  • Golf Mk1: 1975–1983

  • Golf Mk1 Cabriolet: 1979–1993

  • Caddy Mk1: 1983–1992

  • Scirocco: 1974–1992

  • Jetta: 1979–1983

Porsche:

  • 924: 1980–1988

  • 944: 1982–1985

This Part Fits: Mk1 Golf, Mk1 Golf Cabriolet, Scirocco, Jetta, Mk1 Caddy, Porsche 924, Porsche 944,

Availability: Stock Item

Item Name: Heat exchanger

Description: Heat Exchanger, interior heating

Product Group: Cooling

Group: Heating/Ventilation

Unit of Measure: Each

Manufacturer: JOPEX

Dimensions:

Width: 295mm

Height: 205mm

Depth: 64mm

Volume: 3870400mm3

Weight: 0.865kg

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