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Typing this on a iPod so excuse my typing. Went away for the weekend, seven hour drive, on the way temperature gauge would rise from usual safe spot to red over 10 to 20 seconds, hold for a few seconds, maybe up to 10 seconds then fall to normal over about 5 seconds or so. Seemed to be no rhyme or reason as to why or when. As we went along the reading were peaking higher but always going back down and near the end of the drive would hold for a few seconds, max 5 or 10 seconds. We were turning the heat up and down but didn't think of that to after. The end of the drive was city driving and it seemed to happen more during that time. Coolant tank is full, maybe a little above the full line. There is some coolant repair stuff in the overflow tank. Coolant was last replaced about two years ago. All the driving in the past few months has been less than 15 minutes at a time, just around town. There has been a hot smell, little sour smell on occasion but with no other issues I chalked it up to a small oil leak that I've been tracking down. Not even enough loss to need to top up between oil changes (twice a year). I did replace the spark plug tube seals and the grommets and gasket on the plates there in May this year. I went under the steering wheel and connected the two green plugs to make sure the fans were working on the rad and cycled with no issue. Oil level was fine, half way between low and full. Oil and filter was replaced a few weeks ago. I've tried searing this forum and the wider Internet on this thing but it's difficult to say the least and lots of conflicting information, everything from just a sensor to air in the system to a belt or a head gasket. Since I'm not at home and have a long drive I'd really like some input if it is safe to drive home! Thank you in advance.