TwinTurbo.NET: Nissan 300ZX forum - Guage does that because with the core closed the engine
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Subject Guage does that because with the core closed the engine
     
Posted by jzack on September 21, 2015 at 10:00 PM
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In Reply To Signs of a clogged heater core? posted by YlwPrlZTT on September 21, 2015 at 03:05 PM
     
Message warms a little faster. The core acts as a little cooling radiator when valve is open, takes longer for guage to show a coolant temp rise.

FYI...if a car is overheating one way to help cool the engine is to get the heater core valve open all the way.

     
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