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Message: <blockquote data-quote="imidazol97" data-source="post: 363433" data-attributes="member: 1111">In my quote, my first sentence that should have read "if both heater hoses are hot..."You say yours are evenly hot with the heater fan motor on HI. The exit hose might be a littlecooler because the water loses some heat to the air inside the heater box.If your radiator hose at the top doesn't stay cool when the car is cold started, and then startto warm up after the temp gauge starts its move up, you need to think about the thermostat.The thermostat should hold closed until 185 or so. All the hot water should be circulating through the heater hoses and (I believe) a return tube into the block.After idling for 8-10 minutes, you should start feeling the upper radiator hose start to have warm waterin it as the thermostat opens some because the water under it in the block is heating up. So it willopen slightly and some cold water reeturning from the bottom of the radiator will go into the block.After a short drive or idling quite a while, the upper hose should be too hot to hold your hand onfor more than a few seconds, unless your hands are very tought. LOL. It should be up to 190 and morethe temp where the thermostat is wide open.How old is the thermostat? If replaced, was the rubber ring that it sits in the middle of replace? If the edge of the thermostat plate is not in the groove in the middle of the rubber ring, water can goaround.</blockquote>