Need some help! I bought this car to use on my farm. The car had been sitting for a while but it cranked right up with a new battery. The Ac clutch would not engage. Checked the freon it was low. Added freon and it cools good. My question is when i first get in the car and the engine is cold the compressor clutch will not enge untill the Coolant in the radiator has reached temp. to open the thermosta... ??????? it takes 4 or 5 minutes before the Ac get cold. Is this normal?