﻿GET_GEVOMechL2_03_01_01_113 - STEP-BY-STEP Screen
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Typical steps to remove and test the actuating portion of the automatic water drain valve are as follows:

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<b>Warning:</b> To avoid personal injury from engine cooling water burns, do NOT attempt to service the automatic water drain valve when the water temperature is over 100 °F (37.7 °C).

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Perform maintenance only when the engine cooling water system is cooled down.

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1. Carefully loosen and remove the hex body and cartridge from the pipe tee, using a 1-7/8-inch wrench.

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 <b>Note:</b> The internal check valve closes, keeping water from draining from the cooling water system; 

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however, with the hex body and cartridge removed, 

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it is normal for a small amount of water to continue to leak from the pipe tee.

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<b>Note:</b> The hex nut and valve cartridge must be changed out together. 

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Changing only the cartridge can result in debris accumulation in the hex nut and deterioration of the cartridge O-ring nose seal.

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This results in a leak path where water can freeze prohibiting the cartridge from dropping out when required.

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2. With the hex body and cartridge removed, the functionality of the actuating portion may be tested, if desired, as follows:

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a. Intermittently spray canned coolant (available from Therm–O–Tech, Part Number MS–242N) onto the brass sensor at the cartridge tip, keeping a layer of frost on the metal surface. 

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<b>Note:</b> The cartridge should release from the hex body in less than one minute;

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if not, replace the entire unit as discussed in the Automatic Water Drain Valve Assembly Replacement section of this module.

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b. Reinstall the cartridge in the hex body after reheating to above 40 °F (4.4 °C).