Cooling Fan Modes Of Operation

WARNING: This page is about a different car, the 2013 Dodge Avenger and 2013 Chrysler 200. However, it is still accessible from the selected car via links, so may be relevant.

The two speed cooling fan system uses three relays to control the cooling fan operation. These are the Series-Parallel Fan Relay, Lo-Hi Fan Relay and Hi-Med. Fan Relay. During low speed mode, the cooling fans operate in series, splitting the 12 Volt source between the two cooling fan motors. During high speed mode, the cooling fan motors operate in parallel to one another, with each cooling fan motor receiving a separate 12 Volt source.

During low speed mode: The TIPM grounds the (N201) Fan Relay Control circuit, closing the relay to connect the (A16) Cooling Fan 12 Volt Supply circuit to the (N23) Cooling Fan Motor 1 Output circuit. The (N23) Cooling Fan Motor 1 Output circuit supplies 12 Volts DC to Cooling Fan Motor 1. Current flows through the motor to the (N210) Cooling Fan Lo-Hi Control circuit. The current passes through the Lo-Hi Fan Relay to the (N24) Cooling Fan Motor 2 Output circuit and on to Cooling Fan Motor 2. The (Z901) Ground circuit provides the ground path for the Cooling Fan series circuit.

During High speed mode: The TIPM grounds the (N201) Fan Relay Control circuit and the (N112) Fan Relay Control circuit, closing all three Cooling Fan Relays. The (A16) Cooling Fan 12 Volt Supply circuit connects to the (N24) Cooling Fan Motor 2 Output circuit through the Series-Parallel Fan Relay and provides 12 Volts to Cooling Fan Motor 2. The (Z901) Ground circuit provides the ground for Cooling Fan Motor 2. The (A16) Cooling Fan 12 Volt Supply circuit connects to the (N23) Cooling Fan Motor 1 Output circuit through the Hi-Med. Fan Relay and provides 12 Volts to Cooling Fan Motor 1. The (N210) Cooling Fan Lo-Hi Control circuit connects to the (Z901) Ground circuit through the Lo-Hi Fan Relay to provide the ground path for Cooling Fan Motor 1.