Tuesday, October 15, 2013
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In order to charge an air conditioning system or diagnose problems with the system, you must know how to connect and read the compound, or manifold gauges, to the vehicle. The gauges on the manifold serve two functions. They show the technician how much pressure is in the system while the AC is on, or how many inches of vacuum are in the system when discharging or evacuating. The latter is important because it is the most economical way to check for leaks in the system. The connectors on the ends of the hoses are quick-connect type connectors and the lines are color coded, making proper connection almost foolproof.
Instructions
1 Remove the cap on the high side service port, generally located in a line that runs between the compressor and the condenser, somewhere close to the condenser at the front of the vehicle. Pull back on the quick-connect ring on the red hose and push the connector onto the port. Release the ring to secure the hose to the fitting.
2 Remove the cap on the low side service port, generally located close to the firewall of the vehicle, and connect the blue hose in the same manner as the red hose.
3 Screw on the connector at the end of the yellow hose to attach it to a vacuum pump if evacuating the system after repairs or testing the system for leaks. When charging the system, screw the connector on the end of the yellow hose onto either the fitting on a 30-pound tank of refrigerant or a tapping valve if using smaller cans of refrigerant, completing the connection of the compound gauges.
Monday, September 30, 2013
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Acting as both a dehumidifier and cooling system, air conditioners in Dodge vehicles are a standard feature in many of the brands cars and trucks. The cool, dehumidified air travels into the passenger compartment through vents in the dash. The air conditioning system is comprised of four major parts, including the compressor, condenser, expansion valve and evaporator.
Considered the major component of the air conditioning unit, the compressor acts as a means of compressing the refrigerant present in the air conditioning unit into a heated gas. The compressor is equally responsible for the circulation and movement of the refrigerant through the air conditioning unit. Due to its role in compressing the refrigerant, the compressor produces excessive heat. Lubricants present in the unit allow the compressor to function properly. A secondary part of the compressor is the compressor clutch, which is located at the front of the compressor itself. The compressor clutch is constructed of a clutch hub, pulley and field coil. The clutch hub is attached to the primary shaft of the compressor. When the field coil becomes galvanized it leads to the production of a magnetic field that acts to bring the hub in the direction of the pulley, which reacts by pulling the hub toward the pulley and engaging the clutch. The energizing of the clutch begins the pumping of the compressor.
The condenser, the second major component of the air conditioning unit, acts as a means of cooling the hot gas from the compressor and converting it into a cooler liquid form. Found by the radiator, the condenser is where the liquid passes into slits between the coils that line the component. An electric fan located within the unit assists in propelling the cooled liquid through the slits.
After the cooled liquid is processed in the condenser it moves into the expansion valve. The expansion valve acts as a means of lowering the pressure of the liquid gas before it moves into the evaporator.
The final step in the air conditioning unit in a Dodge vehicle is the evaporator. The evaporator further cools the gas. This cooling occurs when a fan attached to the front portion of the air conditioning unit blows over the evaporator. The action of the fan and evaporator combined provide additional cooling before the air is propelled through the vents of the vehicle and into the interior.
