I have a 1998 Sidekick Sport JLX 130,000 miles and I've had almost everything to do with the cooling system replaced one by one over the past 4 months. Now if I drive it under 3000 rpms it overheats within 5 minutes. I am at a loss. I just had the water pump replaced, there a new head + gasket, new fan clutch. New hoses, belts, new radiator and thermastat. The mechanic I go to simply can't figure out what's happening and I'm at a total loss.