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Triumph Thermostat

6 items

Upgrade your vehicle's thermostat with A-Premium's high-quality options. Choose reliability and durability for a smoother ride.

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A-Premium APTHE004 Engine Coolant ThermostatA-Premium APTHE004 Engine Coolant Thermostat
A-Premium®Part # APTHE004
A-Premium APTHE004 Engine Coolant Thermostat
4.688 Reviews
$31.99
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2-year warranty
90 days free return
Fits 1980 - 1982 AMC Concord, 1981 - 1983 AMC Eagle, 1977 - 1977 AMC Gremlin, 1980 - 1982 AMC Spirit, 1979 - 1979 AMC Spirit, 2013 - 2021 Blue Bird Vision School Bus, 1981 - 1986 Chevrolet Chevette, 1982 - 1982 Datsun 720, 1978 - 1978 Dodge D100, 1979 - 1979 Dodge D100, 1978 - 1978 Dodge D150, 1979 - 1980 Dodge D150, 1978 - 1978 Dodge D200, 1980 - 1980 Dodge D200, 1983 - 1985 Dodge Power Ram 50, 1983 - 1985 Dodge Ram 50, 1978 - 1978 Dodge W150, 1979 - 1979 Dodge W150, 1978 - 1978 Dodge W200, 1979 - 1979 Dodge W200
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Vehicle: Triumph
Item LocatedUnited States
Quantity1
MaterialMetal and Rubber
ConditionNew
item #1005V2C8
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A-Premium APTHE003 Engine Coolant Thermostat
A-Premium®Part # APTHE003
A-Premium APTHE003 Engine Coolant Thermostat
4.688 Reviews
$20.99
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2-year warranty
90 days free return
Fits 1980 - 1982 AMC Concord, 1981 - 1983 AMC Eagle, 1977 - 1977 AMC Gremlin, 1980 - 1982 AMC Spirit, 1979 - 1979 AMC Spirit, 2013 - 2021 Blue Bird Vision School Bus, 1981 - 1986 Chevrolet Chevette, 1982 - 1982 Datsun 720, 1978 - 1978 Dodge D100, 1979 - 1979 Dodge D100, 1978 - 1978 Dodge D150, 1979 - 1980 Dodge D150, 1978 - 1978 Dodge D200, 1980 - 1980 Dodge D200, 1983 - 1985 Dodge Power Ram 50, 1983 - 1985 Dodge Ram 50, 1978 - 1978 Dodge W150, 1979 - 1979 Dodge W150, 1978 - 1978 Dodge W200, 1979 - 1979 Dodge W200
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Triumph
Item LocatedUnited States
Quantity1
MaterialMetal and Rubber
ConditionNew
item #1005V2KW
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Beck/Arnley 143-0149 Engine Coolant Thermostat
Beck/ArnleyPart # 143-0149
Beck/Arnley 143-0149 Engine Coolant Thermostat
51 Reviews
$19.99
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3-year warranty
90 days free return
Fits 1964-1968 Alfa Romeo Giulia Sprint, 1997-2002 Audi A4, 1960-1966 Austin Mini, 1962-1962 Austin Mini Cooper, 1963-1963 Austin Mini Cooper, 1964-1964 Austin Mini Cooper, 1965-1965 Austin Mini Cooper, 1966-1967 Austin Mini Cooper, 1968-1969 Austin Mini Cooper, 1968-1970 Austin America, 1973-1975 Austin Marina, 1956-1959 Austin Healey 100-6, 1958-1961 Austin Healey Sprite, 1959-1967 Austin Healey 3000, 1962-1962 Austin Healey Sprite, 1963-1966 Austin Healey Sprite, 1967-1967 Austin Healey Sprite, 1968-1969 Austin Healey Sprite, 1988-1989 Eagle Premier, 1967-1969 Fiat 124
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Triumph
Item LocatedUnited States
QuantityOne Set
Part interchange
143-0149
item #1000XG3Z
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Beck/Arnley 143-0701 Engine Coolant Thermostat
Beck/ArnleyPart # 143-0701
Beck/Arnley 143-0701 Engine Coolant Thermostat
51 Reviews
$21.99
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3-year warranty
90 days free return
Fits 1981-1984 Isuzu I-Mark, 1981-1987 Isuzu Pickup, 1986-1987 Isuzu Trooper, 1968-1968 MG MGC, 1969-1969 MG MGC, 1977-1982 Porsche 924, 1975-1980 Saab 99, 1979-1984 Saab 900, 1985-1985 Saab 900, 1985-1988 Saab 900, 1986-1986 Saab 900, 1975-1981 Triumph TR7, 1959-1960 Volvo 122, 1961-1961 Volvo 122, 1961-1961 Volvo 122, 1962-1968 Volvo 122, 1970-1972 Volvo 1800, 1992-1997 Volvo 960, 1993-1997 Volvo 850, 1997-1998 Volvo S90
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Triumph
Item LocatedUnited States
QuantityOne Set
Part interchange
143-0701
item #1000XDHN
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Beck/Arnley 143-0702 Engine Coolant Thermostat
Beck/ArnleyPart # 143-0702
Beck/Arnley 143-0702 Engine Coolant Thermostat
51 Reviews
$21.99
Edit ZIP code
3-year warranty
90 days free return
Fits 1981-1984 Isuzu I-Mark, 1981-1987 Isuzu Pickup, 1986-1987 Isuzu Trooper, 1968-1968 MG MGC, 1969-1969 MG MGC, 1977-1982 Porsche 924, 1975-1980 Saab 99, 1979-1984 Saab 900, 1985-1985 Saab 900, 1985-1988 Saab 900, 1986-1986 Saab 900, 1975-1981 Triumph TR7, 1959-1960 Volvo 122, 1961-1961 Volvo 122, 1961-1961 Volvo 122, 1962-1968 Volvo 122, 1970-1972 Volvo 1800, 1992-1997 Volvo 960, 1993-1997 Volvo 850, 1997-1998 Volvo S90
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Triumph
Item LocatedUnited States
Quantity1
Part interchange
143-0702
item #1000XG05
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Beck/Arnley 143-0156 Engine Coolant Thermostat
Beck/ArnleyPart # 143-0156
Beck/Arnley 143-0156 Engine Coolant Thermostat
51 Reviews
$15.99
Edit ZIP code
3-year warranty
90 days free return
Fits 1964-1968 Alfa Romeo Giulia Sprint, 1960-1966 Austin Mini, 1962-1962 Austin Mini Cooper, 1963-1963 Austin Mini Cooper, 1964-1964 Austin Mini Cooper, 1965-1965 Austin Mini Cooper, 1966-1967 Austin Mini Cooper, 1968-1969 Austin Mini Cooper, 1968-1970 Austin America, 1973-1975 Austin Marina, 1956-1959 Austin Healey 100-6, 1958-1961 Austin Healey Sprite, 1959-1967 Austin Healey 3000, 1962-1962 Austin Healey Sprite, 1963-1966 Austin Healey Sprite, 1967-1967 Austin Healey Sprite, 1968-1969 Austin Healey Sprite, 1988-1989 Eagle Premier, 1967-1969 Fiat 124, 1968-1969 Fiat 124
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Triumph
Item LocatedUnited States
Quantity1
Part interchange
143-0156
item #1000XG9H
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What is an engine thermostat?

 While all engines can become too hot, if your thermostat isn't working correctly, your engine's well-being is at serious risk. The engine thermostat, often simply referred to as a thermostat, regulates the engine's operating temperature within an optimal range (typically around 195 to 220 degrees Fahrenheit).

How does a car thermostat work?

As a temperature-sensitive valve within the cooling system, a car thermostat responds to changes in coolant temperature. Understanding how it works by the following breakdown steps:

  • Closed position (cold start)

Initially closed to help the engine warm up quickly.

  • Heating up

The engine generates heat during operation.

  • Opening the thermostat

A temperature-sensitive element (usually wax) causes the thermostat to open gradually.

  • Coolant flow

When open, coolant flows from the engine to the radiator.

  • Maintaining optimal temperature

Adjusts coolant flow to maintain the ideal engine temperature.

  • Temperature regulation

Continuously adjusts to prevent overheating and ensure efficient operation.

Signs of a bad thermostat

  1. Overheating: The engine becomes excessively hot due to a stuck-closed thermostat.
  2. Low or fluctuating temperature: A thermostat stuck open results in a cooler engine, affecting fuel efficiency and heating.
  3. Temperature warning light: Illuminates to indicate engine overheating due to a faulty thermostat.
  4. Poor fuel efficiency: Stuck-open thermostat reduces fuel efficiency as the engine operates less efficiently at lower temperatures.
  5. Inadequate cabin heating: Insufficient cabin heating in cold weather with a thermostat that's stuck open.
  6. Coolant leaks: Gasket or sealing issues can lead to coolant leaks.
  7. Rapid temperature fluctuations: The gauge shows rapid swings between hot and cold.
  8. Engine running hot at idle: Higher engine temperature during idle or in traffic due to restricted coolant flow.
  9. Slow or inconsistent warm-up: Longer-than-normal warm-up times, even in moderate weather.
  10. Inconsistent heater operation: This affects the performance of the vehicle's heater, causing inconsistent or inadequate heating in cold weather.

Related Blogs

Why Does Coolant Boil After You Turn the Engine Off?

Learn why coolant boils or bubbles after you turn the engine off, how heat soak affects the cooling system, and how to diagnose leaks, trapped air, cap, thermostat, fan, water pump, or head gasket problems.

Jul 29, 2026