Principles of Operation

Engine Cooling





Special Tool(s)

Principles of Operation

Cooling Fans
The cooling fans are controlled by four relays to provide three speeds.
In HIGH speed, the cooling fans are wired parallel and the following relays are grounded by the PCM:
- Fan braking relay.
- Resistor relay.
In MEDIUM speed, the cooling fans are wired parallel through a resistor and the following relays are grounded by the PCM:
- Fan braking relay.
In LOW speed, the cooling fans are wired in series and the following relays are grounded by the PCM:
- Fan braking relay.
- Resistor relay.
- HEDF and EDF relay.