I own a 2004 Diamante LS and for the last 11 years the temperature gauge has always remained steady about 1 line below the center point of the gauge. Over the past month the indicator has risen to where it is 2-3 lines about the center point.

I checked and topped off the coolant with 50/50 pre-mix coolant and I took it to a local service place to have it checked. They ran a pressure check and said it was operating ok. They did not recommend a coolant flush.

So the fact that it is running hotter than it has over the past 11 years concerns me as I would not want to have any additional problems.

Has anyone seen this issues any comments would be great.

 

If the electric cooling fans are original, it is very possible one or both should be replaced. Check to ensure they are both operational and are operating per original specifications.