Nissan Repair: High temperature..., radiator cap, temperature gauge

Question
"Hey, I know this is not about a Nissan, but I thought it might be similar
enough to ask.  I have a 91 Acura Integra.  Lately the temperature gauge has
been getting pretty high at times.  And then most of the time I'm driving around
its alright.  kind of like it just flares up once in a while.  Could this be one
or more of the temperature sensors going out?  Maybe a problem with the fan?
The radiator was replaced recently, so it's okay.  It seems that my heater has
become way less effective but I'm not sure if it has anything at all to do with
the cooling of the engine.  Based on these clues, what do you think I should
check out first?

Todd"


Answer
Todd,

You either have a bad thermostat or a cooling fan that is going out.  Now, if it were me I would just change the thermostat, radiator cap and flush and fill the coolant and you should be fine.  But, you can check the fan by running the car at idle and see if the fan comes on.  Also, turn the airconditioner on and you will see if the fans come on.  If both fans come on with the airconditioner and one does not come on when the vehicle is hot it is the relay.