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NTC7161G - Coolant Expansion Tank Cap – 15 psi by PR2 AllmakesCooling or Heating Part Land Rover Range Rover Defender, Discovery, Range Rover

NTC7161G - Coolant Expansion Tank Cap – 15 psi

- €31,60
€31,60
€31,60 - €31,60
€31,60
OEM Part
OEM: Made by an Original Equipment Manufacturer. This part is made by an original equipment manufacturer or under their license, ensuring compatibility and quality.
Brand PR2 Allmakes
Coolant Expansion Tank Cap - pressure cap for the cooling system expansion tank, rated at 15 psi.

The cap seals the expansion tank and regulates system pressure: it holds the circuit at its working pressure to raise the coolant boiling point, venting through an integral relief valve once 15 psi is exceeded. As the engine cools, the vacuum valve allows coolant to be drawn back into the circuit, maintaining the correct system level.
Vehicle Model Land Rover Defender up to 2016
Land Rover Discovery 1 1989-1998 (L318)
Range Rover Classic up to 1994
Fitment Notes DEFENDER 1986-2006 — 2.5L TDi, coolant expansion tank pressure cap, 15psi
DISCOVERY 1 1989-1998 — TDi, 2.0L MPi Petrol and V8 EFi; 15psi
RANGE ROVER CLASSIC — TDi Diesel Turbo (1992-1994 from VIN JA610294); V8 EFi to (V) FA399972 and petrol engines from (V) MA647645; 15psi
Alternative Codes
NTC7161GNTC7161

Available to order 2–3 weeks

Not currently in stock. Order now — typically ships within 2–3 weeks.

Need it faster? Contact us about express import (2–5 business days).

When will my order arrive?

This item is ordered from our supplier on request. Typical lead time is 2–3 weeks from order confirmation.

  • Netherlands / Belgium / Germany: 2–4 working days after dispatch.
  • Other EU countries + UK: 4–8 working days after dispatch.
  • Outside EU/UK: contact us for an estimate.

Need it faster? Express import available in 2–5 business days — contact us before ordering.

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 does the coolant expansion tank cap do?
The NTC7161G coolant expansion tank cap seals the cooling system expansion tank and regulates system pressure at 15 psi. Holding pressure raises the coolant boiling point; a relief valve vents above 15 psi, and a vacuum valve draws coolant back as the engine cools. It fits TDi and petrol Defender, Discovery 1 and Range Rover Classic.
Why does the expansion tank cap need replacing?
A coolant expansion tank cap typically fails when the rubber seal hardens or the relief valve sticks, so it can't hold the rated 15 psi. That leads to overheating, coolant loss, or a tank that won't pressurise. It's a cheap, common cause of cooling problems worth ruling out first.
Does the 15 psi pressure rating matter?
Yes, the 15 psi rating matters. The cap must match the system's designed pressure so the coolant boiling point and relief point are correct. Fitting a cap with the wrong rating can cause overheating or stress the radiator and hoses. This cap is rated at 15 psi for these applications.

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