Yesterday I changed my oil and was just checking all my fluids......My power steering fluid was a little on the low side but could not see any evidence of a leak around the hoses coming out of the canister. Does the fluid just get used up after a period of time? Second ? how much coolant should be in the resivor beside the radiator? Just wanderind bout the correct levels and make sure nothing is wrong with my truck as I am bout to get married and we're going to Disney World in the truck.