Issues regarding the installation of the top condenser in the atmospheric pressure column for methanol distillation

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In the atmospheric pressure column used for methanol distillation, an air cooler and a water cooler are employed at the top of the column. The gas phase that has not been condensed by the air cooler enters the water cooler; after condensation, both the liquid phase from the water cooler and the liquid phase from the air cooler flow together into the reflux tank. In actual operation, due to factors such as high temperatures, the air cooler does not perform effectively, while the water cooler also fails to fulfill its role properly. A high flow rate of circulating water has no impact on the pressure at the top of the column, and there is a significant pressure difference between the top of the column and the reflux tank. I would appreciate your advice on this matter. 1. The liquid-phase outlet of the air cooler features an inverted U-shaped bend, which is used to seal the gas phase with liquid (the U-shaped bend is designed for a tower top pressure of 40 KPa). (2) There are valves at both the inlet and outlet of the water cooler. (3) When the column pressure is around 40 KPa, the flow rate at the inlet of the water cooler is high; as the column pressure increases further, the inlet flow rate decreases, and the effect of turning on the circulating water is minimal. Please give me some guidance, thank you!