In article >, says...
>
>
>I have been dealing with an overheating problem on my 1.6 Liter 1996
>Sentra for the past 3 weeks. I have done a lot, ,but the problem
>remains. I need some ideas.
>
>The problem occurred on a return trip from Florida to Texas. The temp
>guage showed that it was overheating so I stopped immediately. Water
>in the overflow tank was boiling. I put on my interior heater and
>nursed the car back home.
>
>The problem appears as boiling antifreeze in my overflow tank. This
>is the first symptom. Later it shows as rising temperature on the
>guage.
>
>Here is what I have tried thus far:
>
>1. Had the radiator checked at the shop. The tech did a flow test
>with a hose. He forced flow in the upper inlet and watched to see the
>amount of flow in the lower exit. The tech indicated that he felt the
>flow was good and that my problem was probably from another source. I
>brought the radiator home without any work done on it.
>
>2. Checked both fans. They both turned on when the temp show in a
>higher range. They also turned on when I started up the ac.
>
>3. Changed out the water pump and thermostat. I have a 120k miles on
>this car.. .so didn't think it would hurt to do these procedures.
>There was no change after putting in the new units.
>
>4. I changed the head gasket because it seemed that I was getting
>bubbling in the antifreeze as I watched it with the cap off. Also,
>it seemed to make sense at this point. I also brought the head to a
>machinist. He indicated that he didn't think that there was evidence
>that the antifreeze entered the combustion chambers of the cylinders.
>Since I had the cylinder head off, I changed the gasket.
>
>I should mention that I learned a lot about timing chains, chain
>tensioners, gears, and their relationships (ugh!). It took a while
>but I got it back together and working.
>
>I'd like to know what you would do next. I am beginning to wonder if
>the radiator is still bad and may need replacement. I would appreciate
>some thoughts. Thanks.

Did you have the radiator cap checked?
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Alex