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Carrier 58STX04510008 Expansion Valve
Your main AC unit would not generate and cold air if it were to lack a properly working expansion valve. Pretty much every air conditioning system has an expansion valve that allows the coolant to spread back into gas state from a liquid.
Indications the expansion valve will eventually need to be replaced
- Your AC takes a really long time in its bid to keep the temperature down
- Cooled air is not cold enough as than the usual air coming from the air handler
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