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Trouble, First of all, thoroughly look over the cooling system. Check the condition of all hoses and check for leaks around the radiator, water pump, head gasket, thermostat, water necks, etc... Then remove the radiator cap and look down inside. There should be little or no white deposits on the tube ends. If everything in the cooling system passes the eyeball check move to step 2 which is the chemical condition of the antifreeze. The chemical condition of the antifreeze can be checked using test strips that can be purchased at NAPA and other automobile stores (be sure they know that you are testing green antifreeze). The strips are simple to use. Using a set of clean needle nose pliers, dunk the strip in the filler neck for the specified time. Allow the strip to develop, as per the instruction, and check the color vs. the code on the instructions. The test strips test for three conditions of the antifreeze; PH, Nitrites and freeze point. If PH or freeze point are out of range, change the antifreeze as soon as possible. If nitrites are out of range low, you could (underline) add a conditioner to the system to increase the nitrite count (more important on diesels than gas engines). Typically nitrites are out of range high with most multipurpose antifreeze (i.e. standard yellow bottle Prestone or knock-off brands) and this is OK for gas engines. Diesel engines should use specially formulated antifreeze. I hope this was helpful. Mark PS Note that SCA"s are REAL important on wet sleeve diesels. Not so much an issue on gas or dry sleeve diesel engines.
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