(m)  
Remove the check valve deactivator tool from the ground air connector.

 (n)  
Close the access door to the ground air connector.

 G.  Clean the Heat Exchangers with a High Pressure Ground Cart as the Pneumatic Source
 S 117-013
 (1)  Use a high pressure ground cart as the pneumatic source to clean the heat exchangers as follows:
 WARNING: WEAR GLOVES THAT WILL GIVE YOU PROTECTION FROM HOT
_______ SURFACES WHEN YOU CONNECT OR DISCONNECT PNEUMATIC FITTINGS. THE BLEED AIR FITTING ON THE GROUND CART CAN BE VERY HOT IF THE GROUND CART HAS BEEN OPERATED IMMEDIATELY BEFORE THIS PROCEDURE. YOU CAN BADLY BURN YOUR HANDS IF YOU TOUCH A HOT FITTING ON THE GROUND CART.
 (a)  
Install a pneumatic hose from the ground cart to the fitting on the bottom of the reverse flusher.

 (b)  
Set the bleed switch on the ground cart to on.

 CAUTION: DO NOT LET THE PRESSURE IN THE REVERSE FLUSHER BE MORE
_______ THAN 2.5 PSIG. THE RAM AIR DUCT COULD BE DAMAGED FROM PRESSURES MORE THAN 2.5 PSIG.
 (c)  Open the bleed air valve on the ground cart.
 CAUTION: DO NOT PERMIT HOT AIR FROM THE GROUND CART WITHOUT THE
_______ DETERGENT TO GO THROUGH THE RAM AIR DUCTS. WITHOUT THE DETERGENT TO DECREASE THE TEMPERATURE OF THE HOT AIR, DAMAGE TO THE RAM AIR DUCTS CAN OCCUR.
 (d)  
Set the bleed switch on the ground cart to off when the container of detergent is empty.

 (e)  
Let the detergent stay on the heat exchangers for a minimum of 5 minutes.

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737-300/400/500MAINTENANCE MANUAL
 (f)  Flush the heat exchangers as follows: 1) Fill the container with water. 2) Set the bleed switch on the ground cart to on to flush the
 detergent and the contamination from the heat exchangers.
 CAUTION: DO NOT PERMIT HOT BLEED AIR WITHOUT WATER TO GO
_______ THROUGH THE RAM AIR DUCTS. WITHOUT THE WATER TO DECREASE THE TEMPERATURE OF THE HOT BLEED AIR, DAMAGE TO THE RAM AIR DUCTS CAN OCCUR.
 3) Set the bleed switch on the ground cart to off when the container of water is empty. 4) Do the steps above again until all of the detergent is removed from the heat exchangers.
 (g)  
Close bleed air valve on the ground cart.

 (h)  
Look at the gage on the reverse flusher and make sure the pressure is 0 psig.

 WARNING: WEAR GLOVES THAT WILL GIVE YOU PROTECTION FROM HOT
_______ SURFACES WHEN YOU CONNECT OR DISCONNECT PNEUMATIC FITTINGS. THE BLEED AIR FITTING ON THE GROUND CART CAN BE VERY HOT IF THE GROUND CART HAS BEEN OPERATED IMMEDIATELY BEFORE THIS PROCEDURE. YOU CAN BADLY BURN YOUR HANDS IF YOU TOUCH A HOT FITTING ON THE GROUND CART.
 (i)  Remove the pneumatic hose from the ground cart and the reverse flusher.
 H. Put the Airplane Back to Its Usual Condition
 S 097-022
 (1)  
Remove the hose with the quick-disconnect fitting from the reverse flusher.

 (2)  
Remove the reverse flusher from the exhaust louvers for the ram air.

 (3)  
Install the access panels to the heat exchangers.

 (4)  
Close the access door for the ram air ducts.

 (5)  
Close the bay doors to the air conditioning equipment.

 S 097-017
 S 417-018
 S 417-019
 S 417-020
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 WATER SEPARATOR TEMPERATURE SENSOR - INSPECTION/CHECK
_____________________________________________________
 1.  General_______
 A.  This procedure has one task. It is the check of the water separator temperature sensor for accurate resistance.
　
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