Heater and Air Conditioning Assembly
100 YRM 1100
HEATER PARTS, REPLACE
HEAT CONTROL KNOB/SWITCHES
WARNING Before removing heater hoses, make sure heater hoses are cool. Hot water may cause severe burns.
The fuses protecting the heater and air conditioning systems are located inside the operators compartment. See Rear Cab Assembly and Fuses.
HEAT CONTROL KNOB/CABLE WARNING When replacing engine heater hoses, make sure replacement hoses meet correct specifications. Failure to meet correct specifications may cause personal injury.
CAUTION Repairs to air conditioning that require discharging and/or refilling of the refrigeration fluid must be performed only by a trained and certified air conditioning specialist.
Adjust NOTE: Without air conditioning, the heat control knob (see Figure 30) is mechanically coupled via a cable to the heater control valve. After replacing the cable or associated item, adjustment of the cable is required. NOTE: With air conditioning, the heater control valve is controlled by an electrical signal and no adjustment is required.
1. Disconnect battery ground lead. 2. Raise cab. See Raise Cab. 3. Disconnect heater hoses if required. ure 29.
See Fig-
1. HEATER/AC FAN SWITCH 2. HEAT CONTROL KNOB 1. SCREWS 2. HINGES 3. HEATER HOSES
4. CONNECTIONS 5. AIR FILTER PLATE
Figure 29. Heater Unit 4. Remove three screws. 5. Tilt unit out. 6. Remove cover plate. See Figure 28.
3. AIR CONTROL KNOB 4. A/C SWITCH (OPTIONAL)
Figure 30. Heater Control Switches
CAUTION The heater control valve cable should always be adjusted with the heater turned off. 1. Turn heat control knob clockwise to full hot position. See Figure 30 and Figure 31.
7. Remove defective part.
2. Position the water valve open against the stop. See Figure 32.
8. Replace faulty component.
3. Fasten the cable clips. See Figure 32.
18