2004 Subaru Impreza Owner's Manual - Page 180
2004 Subaru Impreza Manual
Page 180 highlights
Instruments and controls Intercooler water spray switch (WRXSTi) Pressing this switch causes water to be sprayed into the intercooler. It can be used to help maintain adequate intercooler performance when the ambient temperature is high. NOTE I/C WATER SPRAY UGB079BA UG3509BA Water is sprayed for approximately two seconds every time the switch is pressed and then released. " The intercooler water spray warning light comes on when the water level in the tank has dropped to the lower limit. If the warning light illuminates, refill the tank with water. The tank is located on the right-hand side of the trunk. For the tank refilling method, refer to the "Intercooler water spray" section in Chapter 11. " In cold weather (when you do not use the intercooler water spray), keep the tank half-empty or below in case the water freezes. A larger amount of water could break the tank if it froze. - CONTINUED - 3-43
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