What items are in the cooling system loop?

I know there's the Radiator, and the Block, but what else?

  • This is quite vague: water cooled or air cooled engines? Any particular make? Vehicles from this or the previous century?
    – Bob Cross
    Jan 20, 2014 at 4:22

2 Answers 2


You'll also have the:

  • Cylinder head(s)
  • Water pump
  • Thermostat
  • Heater core

Some cars also have water pipes in the inlet manifold, and some have water-cooled transmission oil coolers.

You've also usually got an expansion tank, but that's not part of the loop itself.

  1. Radiator
  2. Thermostat
  3. Engine Block
  4. Heater Core
  5. Water Pump

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