Triumph Stag Radiator & Hoses - Mk1 (Late) & Mk2 Models

Note: Late Mk1 & Mk2 radiators have a threaded filler plug type neck and an EXPANSION bottle that is fitted with a pressure cap

Efficient Cooling

Maintaining the Stag cooling system in good condition is crucial  in
ensuring proper efficient performance and prolonged engine life.
The radiator should be tested - professionally, and replaced if
necessary. Unless you are certain your hoses are in good
condition we urge you to replace each and every one, including
the heater hoses. The thermostat should be replaced as a matter
of course, whilst the correct strength anti freeze must be used.

And last but not least, we strongly recommend that you flush out
the engine - thoroughly.

Air Locks
After installing a new radiator or, indeed, whenever you have cause
to drain the cooling system, you MUST ensure there are no air locks in
the system when running-up for the first time.

The heater must be 'full-on' (open) and all the hoses should be an even
temperature once the thermostat has opened.

If in doubt please consult a workshop manual.