Sorry Kim .. i was late last night so didnt see all the posts i should have
The A/c wont affect how the car warms up so its not that , you have a manual so its not the usual Tiptronic valve sticking so you either have a Stuck thermostate or its just winter and bloody cold !
Im leaning towards its winter !
Its possible you have an over reading sensor and ill check that next time i work on your car .. REMIND ME !