Engine Coolant Heater Components

Fig 1: Identifying Engine Coolant Heater Components (1 Of 2)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Components: 

1. Control module
2. Fan shroud
3. Heat exchanger
4. Fuel pump (FP) (in front of the fuel tank)
5. Water pump.

Engine Coolant Heater Components, cont. 

Fig 2: Identifying Engine Coolant Heater Components (2 Of 2)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Components on the heater: 

1. Coolant temperature sensor
2. Flame sensor
3. Overheat protection thermostat
4. Glow plugs.