Nissan Repair: nissan sentra thermostat, nissan sentra, proper interval

Question
Why does the anti freeze have to be flushed out when replacing the thermostat?

Answer
Hi Bill -

The correct answer is it is a good time to flush out the cooling system when the thermostat is replaced, because when flushing out the cooling system it has to be removed anyway. Proper interval should be once a year.

Antifreeze not flushed out on a regular basis could leave deposits in the system and hinder cooling capacities. It also acts as a rust preventative, and the boiling point is higher than regular water. As the antifreeze gets older, it loses these properties -

Hope this helps -
aloha
calvin