A couple days ago I saw that my Toyota Camry was overheating, the gauge was going about 3/4s of the way and then returning to normal. I had then replaced the T-stat but noticed the fans were not running, so I replaced the relay as it tested bad. The fans then started to work when the A/C was turned on, but I noticed the car was still going 3/4s of the way then returning to normal. So, I took it to a mechanic and looked for his opinion on it, he tested it and said that everything is working fine and when the engine gets hot enough the fans kick on, bit the gauge still hits 3/4s hot and then returns to normal. My mechanic said that he has seen this before in other car models and that everything is working as intended. I was just wondering if this is a common occurrence with some cars? Or should I look for other possible problems? I’ve never personally owned a car that looked like it was overheating then quickly corrected itself.