It could be that your fluid level is just low. With the engine cold pop the radiator cap off and have a look at your fluid level. If it's low top it off. Also, if it's low before topping it off, check the tubes to see if you are getting build up causing a reduced flow. Mine is almost completely blocked off from using tap water one time while out wheeling and I over heated. I forgot to flush the system when I got back and now I'm looking at having to replace the radiator because it's so plugged up. I had a radiator shop do a flush on it and that helped for a little while, but they said it really needed to be replaced. When I get enough money to order an all metal one from Phoenix I'm going to replace it. The factory and replacement units have plastic ends that tend to leak where the one I found in Phoenix is all metal.

Another thing it could be is the water pump could be failing. If you see the temp drops real quickly when you change engine speed then IÆd check the water pump. If you replace it, replace your timing belt while you are already in there. You should replace them every 60,000 miles anyway.

One last thought, check the wire going to the thermostat. Mine broke one time and was an intermittent connection. It would be fine for a while and then would spike out of the blue. IÆd lose power and it would run rough for a second or two until it cooled back down. I just pulled back the wire loom and put on a new connector.

Hope this helps.

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