Checking Air Conditioning (A/C) And Heater - MacDon M Series Unloading And Assembly Instructions

5.11.12 Checking Air Conditioning (A/C) and Heater

Figure 5.46: M155/M205 A/C and Heater Controls
• Blower switch (A): Controls blower speed. Switch settings are OFF, LO, MEDIUM, and HI.
• Air conditioning switch (B): Controls A/C system. When set to ON, A/C operates if blower switch (A) is switched
ON. When set to OFF, the A/C system does not operate.
• Outside air switch (C): Controls air source. When set to FRESH AIR, booster fan starts and draws filtered
outside air into the cab. When set to RECIRCULATED, booster fan stops and air inside cab is recirculated.
• Temperature control (D): Controls cab temperature. Turn knob clockwise to increase temperature, and turn
knob counterclockwise to decrease temperature.
IMPORTANT:
To distribute oil throughout the A/C system, perform the following steps after starting a machine that has been
stored for more than one week:
1. Start engine and turn blower switch (A) to the first position, turn temperature control (D) to maximum heating,
and turn A/C switch (B) to OFF.
2. Turn A/C switch (B) from OFF to ON position for 1 second, then back to OFF for 5 to 10 seconds. Repeat this
step ten times.
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PERFORMING PREDELIVERY CHECKS
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Revision A