That’s why pressure washers should always be completely drained and stored in a heated area. If the pressure washer is not to be used for an extended length of time, it is recommended that the system be flushed with antifreeze to protect the pump from potential frost damage and for rust and corrosion protection.
① To flush the system with antifreeze, attach a short length of hose to the garden hose connector located on the pump.
② Place the other end of the hose into a container of antifreeze (the antifreeze container will act as a float tank).
③ Start machine and allow to run until antifreeze flows from the end of the wand.
④ Place end of wand back into the float tank (to reuse the antifreeze) and circulate the antifreeze through system for several minutes. Open and close the trigger gun several times to circulate antifreeze through the unloader valve.
⑤ Next, place detergent uptake line into the float tank. Open the detergent metering valve to draw antifreeze into the detergent system.
⑥ Shut down machine. You have now displaced any water in your system with antifreeze.
⑦ For added protection after anti-freezing, disconnect the pressure hose from machine and remove the coil drain plug (refer to owner’s manual for location).
⑧ After coil has drained, replace pressure hose and coil drain plug.
⑨ This is also a good time to check oil levels and condition and to add fuel stabilizer. See your owner’s manual for exact steps to accomplish this with your machine.