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Warm air on a 2016-2018 Chevrolet Cruze has three possible causes. The compressor is the last one to blame, so run the checks here first. If the pump is convicted, the fix is the A/C compressor w/ PXC14 for the 2016-2018 Cruze, GM reference 39067789 at $180.96, against a dealer unit near $563.

Why your 2016-2018 Cruze blows warm air

Warm air is a symptom, not a diagnosis. Three faults produce it. Work them in this order.

• Low charge. Refrigerant (the fluid that moves heat out of the cabin) has leaked below the sensor limit. The system then refuses to run the compressor.
• A compressor that spins but does not pump. The PXC14 is a variable-displacement pump. Its control valve (the electric part that sets how hard it pumps) can die while the pulley keeps turning.
• Everything else. A clogged condenser, a blend door stuck on heat, or a fan that never kicks on at idle.

The general car A/C troubleshooting guide walks the wider tree. Short version: charge first, control circuit second, pump last.

Clutch not engaging? Five checks in order

A silent clutch is usually electrical or charge, not a bad compressor. Run these five checks before ordering anything.

1. Fuse and relay. Pull the A/C fuse and inspect it. Swap the relay with an identical neighbor; a silent relay is the whole fault.
2. Voltage at the clutch connector. Engine running, A/C on max, meter on the two-pin plug at the compressor. Battery voltage convicts the clutch; no voltage means the fault is upstream.
3. Coil resistance. A healthy 12V clutch coil reads 3 to 5 Ω (MACS cites 3.5-4.0 Ω; supplier UAC uses 3.0-5.0 Ω). Open means a broken coil, near-zero a shorted one; the clutch comes off, not the pump.
4. Air gap. Feeler gauge between clutch plate and pulley face, against roughly 0.014-0.030 in (0.36-0.76 mm). A wide gap leaves the magnet too weak to pull the plate in.
5. Charge state. Engine off, static pressure should read nearly the same on both gauges. A low side far below the label means the system is locked out.

All five clean? Now the pump is the suspect. Look for a clutch that engaged and ground, metal dust at the pulley, or a full charge with no cooling.

One compressor, a family of numbers

Every number in that table buys the same PXC14 pump with the same six-rib clutch. Two traps: the 2012-2015 Cruze sedan and the same-era 1.8L cars take different compressors with different mounts.

Koeep stocks both: the compressor for the 2012-2015 Cruze 1.4L sedan, reference 3913319 is the older car's part, and a PXC14 will not bolt onto it. The same-family PXC14 listing under the 39067790 suffix is identical to 39067789 at the same $180.96 with the same SKU.

What the noise is telling you

Only one noise convicts the pump's internals. Match your sound before you buy.

• Grinding the instant the clutch engages, gone when it releases. Worn internals or a dragging clutch bearing; forums document it on high-mileage cars.
• Squeal for thirty seconds on a cold start, then gone. Belt and pulley territory: glazed belts or a corroded clutch, not a failed pump.
• Rapid clicking every few seconds. The clutch engages, hits the low-charge lockout, and drops out. That is a leak wearing a clutch costume; fix the leak and recharge by weight.
• A rusty, seized clutch hub. Salt-state cars do this. Replacing just the clutch assembly often saves the unit.

Every one of those parts lives in the AC & Heating parts collection. Compressors, clutch assemblies, condensers, and receiver-dryers sit one click apart.

Replacing the PXC14: three details that matter

Once the pump is convicted, the job is ordinary modern A/C work. Three details decide whether it comes out right.

• Recover the refrigerant with the machine the label names. Equipment is not interchangeable between refrigerants, and that rule is legal as much as technical.
• Measure the oil, never guess. The whole loop carries only about 2 oz of PAG, most of it inside the compressor. Drain, measure, and add the same volume of fresh PAG to the new unit; one extra ounce hurts cooling.
• Check the condenser and its dryer if the system ran open. This generation uses an expansion valve instead of an orifice tube, with a pipe-type dryer on the condenser whose desiccant protects the new pump.

Then it is ordinary: new O-rings with a light PAG coat, lines torqued, a vacuum that holds, and a recharge by weight from the label.

R-1234yf: the details that cost money

Open the hood and read the radiator-support sticker first. It names the refrigerant, charge weight, and oil, and it wins every argument.

• 17 oz of R-1234yf on these builds, just over 18 oz on R-134a builds. The 2012-2015 Cruze held 20 oz, so the "a can and a half" folklore does not apply.
• GM phased refrigerants mid-year on many lines. Both spec sheets exist for the same model, so the label is the only safe answer.
• Service equipment is refrigerant-specific. R-134a equipment in a yf loop contaminates it, and converting the system is treated as tampering with an emissions control device.
• The refrigerant is expensive. Retail pricing has run near $160 per pound, so fix leaks instead of topping up annually.

For the pump family itself, the dedicated PXC14 technical guide for the 2016-2018 Cruze covers PXC14 numbering, valve behavior, and compliance.

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