Civic VP Sedan L4-1590cc 1.6L SOHC MFI (1999)
Condenser Fan: Description and Operation
Radiator Fan
Voltage is provided at all times to the radiator fan relay (contacts) through fuse 57. With the ignition switch in ON (II), voltage is provided to the coil of
the relay through fuse 17.
The radiator fan relay can be grounded through either the engine coolant temperature switch or the engine control module (ECM) or Powertrain Control
Module (PCM).
The engine coolant temperature switch grounds the radiator fan relay (coil) when the engine coolant temperature exceeds 199 °F (83 °C). The switch
opens when coolant temperature decreases 3 ° - 8 °C.
Condenser Fan
Voltage is provided at all times to the condenser fan relay (contacts) through fuse 56. With the ignition switch in ON (II), voltage is provided to the coil
of the relay through fuse 17. When you push the A/C switch and put the heater fan switch in 1, 2, 3, or 4 position, the A/C thermostat comes on, the
condenser fan relay energizes, and the condenser fan motor runs.
A/C Thermostat
The A/C thermostat is located on the evaporator housing. The A/C thermostat turns off the A/C compressor clutch if the temperature at the evaporator
goes below 3 °C (37 °F). This prevents condensation from freezing on the evaporator fins and blocking the air delivery into the passenger compartment.
If the temperature goes below 3 °C (37 °F) turning off the A/C thermostat, ground will be removed from the condenser fan relay. This will deenergize
the relay and remove voltage from the condenser fan motor causing the fan to stop running.
