Tech Tip of the Week:
Do you really know the pressure of your A/C system? On some GM applications, the high side service port is located behind the condenser and before the orifice tube on the liquid line. This positioning makes diagnosing by gauges deceiving. Usually the high side port is found before the condenser. With the port in front of the condenser, it gives you a more accurate understanding of what the pressure truly is going into the condenser. With the high side after the condenser, you could receive a pressure reading that is false due to a partially blocked condenser. With a partially blocked condenser, the only reading you will receive is what is exiting the condenser. The correct way to diagnosis a system that has the service ports so close together is through the use of temperature testing: 1.Check the temperature at the inlet and outlet of the condenser. *An acceptable temperature differential is 30-50 degrees Fahrenheit. 2.A low temperature differential could mean an airflow problem, such as bad cooling fans or restricted air flow. 3.A high temperature differential could mean an internal restriction in the condenser. * Remember: On late model systems the condenser cannot be flushed and must be replaced. gpd's Temperature Tester (5811585) should be used to obtain an accurate temperature diagnosis.
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global parts distributors, L.L.C. (gpd) started out as Auto Air of Macon in 1974 as an automotive A/C installation and repair shop. Over the years our business has evolved, and today we are one of the most knowledgeable and dependable sources for aftermarket A/C parts and radiators in the United States.