Auxiliary air conditioning system for trucks and other heavy duty vehicles

In a truck having a main engine having a water jacket, and an air conditioning system including a primary compressor, a primary condenser, at least one air conditioning unit, and refrigerant lines including a first refrigerant line coupling the primary compressor to the primary condenser, an outlet refrigerant line which delivers refrigerant from the primary condenser to the air conditioning unit and an inlet refrigerant line which returns refrigerant from the air conditioning unit to the primary compressor;

• an auxiliary power system comprising:
• a secondary engine smaller than and independent of said main engine, said secondary engine having a water jacket with an inlet for coolant fluid and an auxiliary water pump which pumps coolant fluid out of said water jacket of said secondary engine;
• auxiliary coolant lines including an auxiliary coolant outlet line which routes coolant pumped by said auxiliary water pump into said water jacket of the main engine, and an auxiliary coolant inlet line which routes coolant fluid from the water jacket of the main engine into said water jacket of said secondary engine;
• and
• an auxiliary air conditioning system having:
• an auxiliary compressor, driven by said secondary engine, having an inlet and an outlet, an auxiliary condenser having an inlet coupled to said outlet of said auxiliary compressor and an outlet;
• an auxiliary fan which cools said auxiliary condenser;
• and auxiliary refrigerant lines connecting said auxiliary compressor and condenser to the air conditioning system in parallel with the primary compressor, and in series with said primary condenser.