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car temperature guage fluctuating

after successfully replacing my clutch and reassembling my 2003 eclipse RS, i now have a problem. When driving, the temperature gauge fluctuates between halfway and the quarters of the way up. its all good-ish. unfortunately, when i turn the heater on, it runs hot for a little while, and then gets very cold. tonight i almost went into the red on the temp gauge when i turned it off after it got cold on me. what should i be looking for? HELP!!!


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