HVAC
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    car
    truck
    rv

    Why Is My Car A/C Not Blowing Cold?

    Typical repair cost: $150–$2,500

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    Common Symptoms

    Air blows warm
    Weak airflow
    Cold then warm cycling
    Hissing under dash
    Musty smell

    Most Likely Causes

    1

    Low refrigerant from a leak

    Most common cause. Systems should not lose refrigerant — any low charge means a leak.

    2

    Failed A/C compressor

    Clutch does not engage or compressor seizes; often shows as no cold + loud noise.

    3

    Clogged expansion valve / orifice tube

    Causes uneven cooling and frost on the low-side line.

    4

    Failed blower motor or resistor

    Weak airflow even though system is cold.

    5

    Clogged cabin air filter

    Reduces airflow drastically; cheap to replace.

    How a Shop Diagnoses It

    1. 1.Connect manifold gauges; compare low/high side pressures to spec.
    2. 2.UV dye or electronic leak detection at fittings, condenser, evaporator.
    3. 3.Confirm compressor clutch engages with system command.
    4. 4.Inspect cabin filter and verify blower speed range.

    When to see a professional

    Repeated DIY recharges mask a leak and waste refrigerant — get a proper evacuation and leak test.

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