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Brief description of my problem: Upon cold starting my car, it will take roughly 10-15 minutes for the factory temp gauge to even begin to move. Im sure this could be very normal on most cars however...my real issue begins when i actually start driving, once the car is under load or i am driving up a steep hill, the temperature will shoot up to 76 degrees, (pretty standard i think) Although the second i start driving down a hill the temperature reading will drop dramatically, usually to just below 50 degrees, that is, so the factory temp needle has returned back to the bottom. Variabilities/changes: Facts and things i have noticed or changed in an attempt to fix this, the motor is an sr20de running a stock radiator and a new thermostat. A clutch fan in good working order (swapped the old one out). I also have, a device to read the figures the ecu is picking up from the temp sensor. And a water temp gauge (defi) fitted in the upper radiator hose. This means i have two separate readings giving me roughly the same information (usually 3-2 degrees either way). Around the time this issue started i lost use of my aircon, it now just pumps out hot air. Coolant was flushed with new coolant put in, changed nothing. This problem has been going on for about 6 months and so far its not proved to be any sort of a serious issue however its just really confusing, id be really interested to know if anyone has had the same issue! If ive left someone out or more info is needed just abuse me. Thanks for any help!