Volvo C30 2007 Service And Repair Manual page 508

Perform a performance test of the engine's preheater. See: FUEL-POWERED PREHEATER, CHECKING
FAN MOTOR FUEL-POWERED PREHEATER (B5244S4)
NOTE: The illustrations in this service information are used for different model years
and/or models. Some variation may occur. However, the essential information in
the illustrations is always correct.
PREPARATORY WORK
REMOVING COMPONENTS
Remove:
the engine coolant heater. See FUEL FIRED BOOSTER HEATER (B5244S4)

the combustion preheater module (CPM). See: FUEL FIRED BOOSTER HEATER CONTROL UNIT

(B5244S4).
REMOVAL
REMOVING THE FAN MOTOR FOR THE ENGINE COOLANT HEATER
Fig. 128: Identifying Screws For Cover Over Fan Housing
2012 Volvo C30 T-5
HVAC Climate Units - Removal, Replacement And Installation