Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System

low-pressure and high-pressure sides of the refrigerant system. Refrigerant entering and exiting the evaporator core passes through the TXV through 2 separate flow paths. An internal temperature sensing bulb senses the temperature of the refrigerant flowing out of the evaporator core and adjusts an internal pin-type valve to meter the refrigerant flow into the evaporator core. The internal pin-type valve decreases the amount of refrigerant entering the evaporator core at lower temperatures and increases the amount of refrigerant entering the evaporator core at higher temperatures.

Service Gauge Port Valves

The service gauge port fitting is an integral part of the refrigerant line or component.

Prior to leak testing, blow air over the service gauge port valves to ensure an accurate test. Special couplings are required for both the high-side and low-side service gauge ports. A very small amount of leakage around the Schrader-type valve with the service gauge port valve cap removed is considered normal. Install a new Schrader-type valve core if the seal leaks excessively.