HouseCallAuto 4/22/2010Attach a code reader to read the stored fault codes if any. Repost with codes if any and we can help better. The way that this cooling fan problem is diagnosed is using a professional scanner that can interface with the vehicle computer and command the fans on and read live data. Without this important tool the diagnostic process will be time consuming and invasive. You will have to manually check for battery voltage and ground at the cooling fan motor or motors if two (don't remember) and at the relay and at the PCM output signal to the relay.