Brother is the radiator or pipes reducing water?
Temperature needle always remains on middle and fan should be auto. Likewise A/C also trips auto.
How is the condition of your radiator? Are the fins normal or they are bent more than 50%.
Get a new jali for 5,000 rupees or kabli one for 2,500 rupees and fill ZIC Super A green coolant with 50 percent clean fresh water.
First thoroughly check for any leakage. Water cannot go anywhere from a sealed radiator for months. There are some pretty good radiator mechanics at Korangi road when going left hand to FTC, they take 800 rupees for regular radiator service.