ENGINE AR 1W1346 - Caterpillar

Introduction
Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.Safety Section
Failure to follow all safety guidelines prescribed in this document and by governing authorities and regulatory agencies may result in severe injury or death of personnel or machine damage.
Note: This modification is only for machines in environments with extreme heat and humidity where the evaporator is experiencing icing.
Personal injury can result from contact with refrigerant.Contact with refrigerant can cause frost bite. Keep face and hands away to help prevent injury.Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant.Always use precaution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, release it slowly in a well ventilated area.Personal injury or death can result from inhaling refrigerant through a lit cigarette.Inhaling air conditioner refrigerant gas through a lit cigarette or other smoking method or inhaling fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or death.Do not smoke when servicing air conditioners or wherever refrigerant gas may be present.Use a certified recovery and recycling cart to properly remove the refrigerant from the air conditioning system.
Required Parts
Table 1
Item Qty Part
1 1 448-0024 Temperature Sensor Installation Procedure
Illustration 1 g06182638
Remove the old temperature sensor (A) from the conditioner group (B). Place silicone sealant over the hole of the removed sensor.
Illustration 2 g06182647
(AA) 51.5 mm (2.03 inch)
(BB) 330.5 mm (13.01 inch)
Drill a 5 mm (0.20 inch) hole (D) in the top of case (C) using dimensions in Illustration 2.Note: Be careful to drill through only the non-metallic case to avoid damaging the evaporator.
Illustration 3 g06182650
Insert temperature sensor (1) through the 5 mm (0.20 inch) hole (D) into the evaporator.