Eclipse Temp. Fluxuates

[mint567]

My eclipse with no mods just stock, the temperature fluxuates when i am going down the highway or idling. It doesn't matter. It has been checked by a couple of local mechanics. None of them could find a problem. They say that they checked the thermistat and everything. The fluxuation continues to go on. It never stays hot. It will run normal at half way between H/C. then it will go up 3/4 to hot, then drop back down after about 30 seconds or so. It doesnt matter if the weather is hot or cold. It does it no matter what. Any ideas suggestions? THanks.

[BoostedSpyder]

check to make sure the overflow tank is secured and the hoses are on where they should be. i had the same problem and my tank was completly gone [just dissapeared one day], but i was told it was pressure differences giving off wierd readings. hope that helps...

[mint567]

Where might I find this tank at?

[xjoeharperx]

1. air in the cooling system
2. temperature sending unit out of range.
3. thermostat malfunctioning
4. fan temperature switch out of range

[ashah000]

Originally Posted by mint567

Where might I find this tank at?

It should be near the Power stearing belt, lower left corner of engine bay. It is a yellowish color.
Make sure it is not leaking, mine was not properly mounted and the PS belt ate the side of it.