It could be something simple like the OEM hose clamps. Check to see if the upper and lower radiator hoses rotate easily, if they do replace the clamps with standard screw type hose clamps.Warm the engine and check all of the heater lines, and check for pin holes in the radiator hoses. An easy way to check for internal engine coolant loss is to pull the dip stick after the engine is warm and look at the oil. If the oil looks normal with no froth or bubbles or milky color, you are OK.If you take and put a drop of oil on the exhaust manifold it should just flow and smoke, not bubble and boil.The OEM spring type hose clamps are the usual suspect though, especially for the trany, power steering, etc.
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