Skip to content
8–23 August: reduced summer staffing. Orders may take up to 5 extra working days to dispatch and emails up to 2 working days to answer. Thanks for your patience.
8–23 Aug: orders may ship up to 5 days later.

STC3135 - Heater Matrix – 300TDi – A/C

Original price - Original price €77,20
Original price
€77,20
€77,20 - €77,20
Current price €77,20
Aftermarket Part
Aftermarket: Quality alternative. This is a quality alternative, designed to fit and function like the original part, often at a more competitive price.
Heater Matrix is the cabin heat exchanger inside the heater assembly.

Engine coolant is routed through the matrix core while the blower draws air across its fins to warm the cabin and demist the windscreen. It sits downstream of the heater control valve within the HVAC housing. Specified for the 300 TDi engine in air-conditioned applications.
Vehicle Model Land Rover Discovery 1 1989-1998 (L318)
Range Rover Classic up to 1994
Fitment Notes DISCOVERY 1 1989-1998 — 300TDi, Air Conditioning
RANGE ROVER CLASSIC 1992-1994 — 300TDi, Air Conditioning (from VIN JA610294)
Alternative Codes
STC3135STC4784

In stock 2 units
1 · Gouda 1 · Drachten
Express delivery available

When will my order arrive?
  • Order before 15:00 (Mon–Fri): same-day dispatch for in-stock items.
  • UPS Express (order before 14:00): dispatched today, delivered tomorrow where available.
  • Netherlands / Belgium / Germany: 2–4 working days.
  • Other EU countries + UK: 4–8 working days.
  • Outside EU/UK: delivery times vary — contact us for an estimate.

Items may ship from multiple warehouses at no extra cost.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What is the Heater Matrix and what does it do?
The Heater Matrix is the cabin heat exchanger inside the heater assembly. Engine coolant flows through its core while the blower draws air across the fins to warm the cabin and demist the windscreen. It sits downstream of the heater control valve in the HVAC housing.
Which engine and models does this heater matrix fit?
This heater matrix is specified for the 300 TDi engine with air conditioning, fitting Discovery 1 and Range Rover Classic. Confirm your vehicle runs the 300 TDi and has factory A/C, since other engine and heating setups use a different matrix.
What are the signs a heater matrix needs replacing?
A failing heater matrix typically shows as a sweet coolant smell in the cabin, fogging inside the windscreen, or coolant residue in the footwells, which usually point to a leaking core. Weak cabin heat can also indicate a blocked or corroded matrix.
Is there an alternative part number for this heater matrix?
Yes, STC4784 is listed as an alternative to this heater matrix for the 300 TDi air-conditioned application, covering the same Discovery 1 and Range Rover Classic fitment. Check which reference your supplier or workshop manual lists for your vehicle.