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Q:

why my 1996 acura tl 3.2l temperature gauges goes up to hot then fall down? on 1996 Acura TL

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Changed sensor and radiator
(1) Answer
When the guage drops to cold are you still getting heat inside? is it randomly going up & down quickly or is it gradual? the guage may be faulty or there may be air trapped in the system . when you changed the rad. & sensor , did you change the thermostat? Is it functioning properly.