One is for engine cooling and the other one is for A/C. So, if your A/C is on, both should turn on periodically to cool the engine off. With the A/C off, the one on the right (if I remember correctly should turn on and off periodically). If none of them turn on for a long period of time to a point that the temp gauge rises exponentially, ten you have a problem.
Use jumper wires to connect and test the fan motors directly to the battery. If they work, then swap the relays with other similar relays. If they work, then the problem lies in your coolant temp sensor.
Saturday, October 11th, 2008 AT 3:17 AM