I have antifreeze leaking from the back radiator

There is a hose on the upper rear of the engine block.I think its a heater hose. Anyhow, its has a "Y" shaped plastic adapter that is known to leak on sorentos. Buy the part and pay a shop to change it. I spent 2 hours tring to get to itwith no luck. I took it to a shop and it took them 5 hours and 3 technicians to change it out. Good luck.

Seems to me that you have a crack in the radiator hose either at the clamps or in the middle. 6 years is a pretty good life for a hose like that. I would not suspect your water pump unless you have a specific leak around it (usually at the base of your cooling fan). Ask your local NAPA auto for a replacment hose and buy some new antifreeze while you are at it. Hopefully the hose is easy to access, being the back one. The hoses are fairly easy to replace- you will need a large flat pan to catch the old antifreeze as you unscrew the clamps that connect the hose to the radiator and engine. Don some rubber gloves to keep your hands clean if you want. Once the engine has cooled overnight, unscrew the hose clamps, remove one end of the hose and drain the antifreeze . CAUTION: Do not let the antifreeze sit out uncovered if you have dogs- they love the stuff and it will kill them. If the hose is stuck, you will need to work it back and forth on the fitting to break the bond between rubber and metal. Clean the hose fitting and wipe a little lithium grease (or vaseline) into the ends so that the new hose will slip on better. Position the loosened clamps on each end of the new hose and work the new hose onto the fittings. Tighten the clamps just until you see the rubber bulging around the clamp bands. Refill the radiator with the new antifreeze and start the engine. Fill the radiator more if it settles being careful to not open the radiator too quickly if the engine is hot. Discard the old antifreeze in the new , now empty container at your local auto store.

Hope this helps,

Jeff

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