I have a 01 lb7 ,163000 miles that has developed a slight coolant leak on the drivers rear side of motor. I just changed the water pump with a new gm pump about 2 months ago. It didnt start to leak untill last week. But its been very cold lately. It appears to be leaking at the rear of the crossover tube. It doesnt leak all the time. What holds the tube in the rear of the motor? I am guessing that it is sandwiched between the waterpump and something. Also is there any coolant hoses that run around to the rear of the engine on the drivers side that could be leaking?Truck runs great no over heating or any thing. Thanks for any help.