how many miles and is it the original radiator? my 02 oem was part plastic, the top piece. they start to get cracks n will seep coolant. this wont immediately show a temp rise on your gauge unless you r low on coolant as the cracks are passing more noticeable amount of coolant out of the system. not sur what come in the 05, but its worth a check. when u r doing the system pressure check n the engine is warm check along the top of the radiator for coolant seep. gl.