2003 dodge caravan heater hose diagram . I have been told to check to see if one is hotter than the other. The heat doesn't work.

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The reason you do that is to test if the heater core is passing water through it. If one is hotter than the other, then water is not entering the heater core. If both are the same temperature then the problrm is either electrical or the blend door is not working.
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