Did you check the motor temperature as well? Considering a latest truck i hope AC motor is in their to drive the pump. If motor us heating up as well then disconnect the pump and check the motor Amps with and without load. There is a possibility that motor has faulty bearings which are causing this. If motor is normal then In such situation i will go for a pump service first. I doubt if Pump seal kit is still alright with this excessive heat.
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