Why does my temperature gage show the engine over heating when it really isn't? on 2000 Dodge Caravan

Also my AC starts to blow just cool air when the temperature gage starts to rise in the hot zone. I have a 2000 dodge caravan. I'm not sure but it seems to happen sometimes when i'm driving over 45mph. I turn of AC and slow down and the temperature gage goes back to normal and the AC will blow cold air again until the scenario happens again, whic is frequently.

by in Summerville, SC on July 25, 2012
1 answer 5 comments
ANSWER by on July 25, 2012
SOUNDS LIKE A COOLING FAN ISSUE. CK FAN OPRATION TO START WITH
COMMENT by on July 25, 2012
Colling fans working.
COMMENT by on July 25, 2012
look for condensor fins or radiator plugged
COMMENT by on July 25, 2012
There's no problem with those either. Someone suggested the coolant temperture sensor. Could that cause a problem?
COMMENT by on July 25, 2012
most likely not. seek a prof opinion
COMMENT by on July 25, 2012
I will; thank you.