1971 Triumph Stag Cooling System Parts

This table covers the engine coolants and antifreeze formulations specified for this cooling system. Typical signs include a rising temperature gauge, rusty or sludged coolant, or a heater that blows cold. Use the chemistry named in the notes. Mixing silicate, OAT and HOAT formulas can gel in the radiator. Read more

16 Coolant / Antifreeze parts for the 1971 Triumph Stag come from 4 brands — PEAK, PRESTONE, FVP and 1 other brand. The "Popular" part is FVP MV5050GAL.

In the Compatible With All Colors grade, PRESTONE supplies 1 part: grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. A representative part number is PRESTONE AF3055.

The Economy section lists 4 options from FVP, PRESTONE, PEAK and 1 other brand — the catalog's value-priced group. FVP MV5050GAL is listed in this group.

In the Heavy Duty grade, VALVOLINE supplies 1 part: rated for severe service. A representative part number is VALVOLINE ZXG051.

In the Premium grade, PRESTONE and PEAK supply 4 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.

In the Standard Replacement grade, PEAK, FVP and PRESTONE supply 6 parts: built to original-equipment specification. A representative part number is FVP GREEN5050GAL.

This table covers the adapters used to pressure-test this cooling system. Read more

2 Cooling System Tester Adapter parts for the 1971 Triumph Stag come from 2 brands — ACDELCO and MOTORAD.

Listed part numbers: ACDELCO 12A01 and MOTORAD 3003.

This table covers the caps that hold system pressure at the radiator or reservoir neck. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

3 Radiator Cap parts for the 1971 Triumph Stag come from 2 brands — MOTORAD and SKP.

In the Locking Replacement grade, MOTORAD and SKP supply 2 parts: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is MOTORAD ST13.

Standard Replacement: 1 part, from MOTORAD. A representative part number is MOTORAD T13.

This group includes MOTORAD ST13, SKP SKST13 and MOTORAD T13.

This table covers the upper, lower and connecting hoses between radiator, engine and reservoir. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle. Read more

5 Radiator Hose parts are listed for the 1971 Triumph Stag, from GATES, DAYCO, ACDELCO and 1 other brand. GATES 20801 carries the "Popular" badge.

Economy: 2 parts, from DAYCO and GATES. A representative part number is DAYCO 81021.

The Standard Replacement section: 3 options from GATES, ACDELCO and CONTINENTAL. GATES 20801 is listed in this group.

This group includes GATES 20801, DAYCO 81021 and GATES 25252 and the remaining parts above.

This table covers the senders that report coolant temperature to the gauge or ECU. Typical signs include a gauge that sits on empty or overheat, or a lamp that does not match what the engine is doing. Rule out the cluster and the wiring before replacing the sender. Read more

2 Temperature Sender / Sensor parts for the 1971 Triumph Stag come from 2 brands — ROSTRA and STANDARD MOTOR PRODUCTS.

Part numbers include ROSTRA 680107 and STANDARD MOTOR PRODUCTS TS226.

This table covers the thermostats that open the coolant circuit at the specified temperature. Typical signs include slow warm-up, a gauge that climbs in traffic, or heat that never quite arrives. Replace the housing gasket with the thermostat and bleed the system so a trapped air pocket does not cook the new part. Read more

12 Thermostat parts are listed for the 1971 Triumph Stag, from MOTORAD and GATES. MOTORAD 2028180 carries the "Popular" badge.

In the Performance grade, MOTORAD supplies 3 parts: engineered beyond original-equipment specification. A representative part number is MOTORAD 2028180.

The Premium section: 3 options from MOTORAD. MOTORAD 7228180 is listed in this group.

The Standard Replacement section: 6 options from MOTORAD and GATES. MOTORAD 228195 is listed in this group.

This table covers the seals at the thermostat housing and water outlet. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

3 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 1971 Triumph Stag come from 2 brands — MOTORAD and GATES.

Part numbers include GATES 33624, MOTORAD MG38 and MOTORAD MG91EA.