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Theres defective oem nissan thermostats floating around,a cold lower hose means the thermostat isnt opening,when u run without a thermo,both hoses are somewhat warm because ofthe constant flow,so normally,both hoses need to be warm to hot,i have 3 NEW,yes new nissan thermostats,put all 3 in a pot and boiled water,inserted temp gauge and one opens up at 76c other 2 dont START to open till about 95c,so by the time its fully open,the gauge reads 120c.,i bled the air out a million times till I thought to test them,i figuered new nissan oem parts wouldnt fail,the one that works looks different,the other 2 have the outer parts like non oem,but I purchased them at nissan......also make sure you installed the thermostat correct,the jiggle valve on the stat needs to be at 12oclock
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