volvo 240 air cond on 1990 Volvo 240

could i leave on the thermostat regulator button all the time or do i have to keep on closing it every time i park the car....i want to keep the thermostat regulator button at a fixed temp without going every now and then through the trouble of turning the knob and adjusting the temp again and again...also the knob (or button) is beginning to get loose...

Asked by for the 1990 Volvo 240
You can leave it in any position you want and it won't cause an issue.