651E Wheel Tractor-Scraper Air Conditioner - Test Caterpillar

Air Conditioner - Test

------ WARNING! ------

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 air conditioner refrigerant gas may be present.


  1. Start the engine. Operate the engine at high idle.

    Illustration 1g00101034

  1. Set the air conditioner control for maximum cooling. Set the fan speed switch to HIGH SPEED.

  1. Allow the air conditioning system to run for two minutes in order to stabilize.

    Illustration 2g00101036

  1. Feel suction line (1) and discharge line (2) in order to check the system for refrigerant.

    If the system contains refrigerant, the discharge line will be warmer than the suction line.

    If the system contains no refrigerant or the system contains only a small amount of refrigerant, poor cooling will result.

  1. If poor cooling is experienced, turn off the air conditioner. Stop the engine. Consult your AVSpare Dealer for air conditioner system service.