LR
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CoolingHigh severity

Td5 coolant loss with no visible leak

Safety or reliability risk. Fix promptly.

Symptoms

Coolant level drops steadily, white smoke from the exhaust, pressurised coolant system, overheating on long runs.

Likely cause

Cracked cylinder head, particularly early 10P heads, or a failed head gasket.

Suggested fixes

Listed roughly in the order most owners try them.

  1. 1

    Pressure test the cooling system

    Rule out a leaking expansion tank cap, heater matrix or hose first.

    Difficulty:
    Moderate DIY
    Cost:
    £ (Under about £50 in parts)
  2. 2

    Perform a combustion gas test

    A block tester confirms combustion gases in the coolant.

    Difficulty:
    Easy DIY
    Cost:
    £ (Under about £50 in parts)
  3. 3

    Fit a reconditioned later specification head

    A tested 15P head with new gasket and bolts is the usual long term fix.

    Difficulty:
    Specialist job
    Cost:
    £££ (Over about £300)

This is general guidance gathered from owner experience and workshop practice, not a substitute for a workshop manual or a qualified mechanic. Costs are rough parts-only guides. Brakes, steering and suspension work affects safety, so if in doubt have it checked professionally.

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