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Heater blowing cold air

96K views 22 replies 16 participants last post by  Clint 
I had recurrent low coolant and air pockets on my '13 V6. I never found an external leak. I checked the motor oil for water, I checked the exhaust for water, i checked the water for exhaust gas and never found anything. Then like a few others I replaced both caps even though they "looked good", filled it and purged the air one last time and I have not seen the problem occur again since then. Even the guy at the parts counter at the Nissan dealership asked me to confirm that I was actually buying two radiator caps -- they look the same but they are not.
 
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