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You're on the right track. Have the fault codes checked with a scanner to confirm. Usually the radiator cooling fan relay is the culprit especially if the fans aren't coming on either when the engine gets hot or when you turn on the A/C. Should see a P0480 series code. Autozone will check codes for free. Not positive on the location of the relay on an 05. It's either down low on the drivers side on the frame next to the radiator or on the frame near the headlight. Follow the wire harness from the fans and you'll find it. This isn't your average relay so it's not in the relay panel (IPM). It's actually a pulse width modulated microprocessor that gets very hot. It uses the vehicle frame as a heatsink to dissipate heat. They cost anywhere from $40-$80.
In some cases a fan motor can sieze and burn out the relay. Before changing the relay spin the fans by hand. If one turns only a time or two this may be the case. Power the fans directly to make sure they work. Jumper power to the fan connector straight off the battery or or at the relay connector.
Last edited by RIP; 06-09-2010 at 02:12 PM.
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96 Gr Caravan LE 3.8, 212K miles
07 Fusion / 06 RAV 4 / 06 Accord