Find your car sparesEnter your registration below

Buy Air Con Pulley Online

Also known as: Air conditioning compressor pulley, Pulley, air conditioning compressor, Air Con Pulley

OEM & aftermarket ac compressor pulley from top brands — compare prices, check fitment, order with free delivery

Shop 1 ac compressor pulley from leading manufacturers. Compare prices, check vehicle compatibility, and get free delivery on orders over £99.

AC Compressor Pulley buying guide — what to know before you buy

The air conditioning compressor pulley spins continuously on the engine auxiliary belt, driven by the crankshaft. When the air conditioning is switched off, the electromagnetic clutch disengages and the compressor shaft remains stationary whilst the pulley freewheels on its bearing. A worn or seized pulley bearing causes a persistent squealing or grinding noise even with the air conditioning off, and can generate enough heat to damage the serpentine belt. Denso, Sanden, and NRF supply replacement compressor pulleys and bearing assemblies that can be fitted without removing the compressor from the vehicle or recovering the refrigerant.

Diagnosing a faulty compressor pulley

Distinguishing between a pulley bearing fault and other belt-driven component failures requires a systematic approach. The AC compressor pulley is unusual in that it spins at all times, regardless of AC system status.

Squeal or grind that is present even with AC switched off — rules out clutch or internal compressor fault
Noise that disappears when the auxiliary belt is removed temporarily — confirms belt-driven component
Squealing that increases with engine speed — bearing or belt tension issue
Wobble visible in the pulley face — damaged pulley or bearing collapse
Belt debris or belt wear accelerated on the AC compressor span

Pulley bearing replacement

The pulley bearing is a sealed unit pressed into the pulley body. To replace it, remove the drive plate (held by a central bolt), then withdraw the pulley using a puller. Press the old bearing out and the new one in, then refit the pulley and drive plate. The refrigerant circuit does not need to be opened for this repair.

A clutch hub puller is needed for drive plate removal — do not lever against the compressor body
Note the shim washer stack behind the drive plate — replace them in the correct order
Check the drive plate friction faces for wear whilst the assembly is apart
Verify the air gap after reassembly — adjust shims if outside specification

Replacing the complete pulley assembly

If the pulley body itself is cracked or the bearing seat is damaged, a complete pulley and bearing assembly is more cost-effective than fitting a new bearing into a damaged carrier. Complete assemblies are available pre-assembled and fit directly onto the compressor shaft.

Frequently Asked Questions

Are ac compressor pulley and air conditioning compressor pulley the same thing?

Yes. "AC Compressor Pulley" and "Air conditioning compressor pulley" refer to the same car part. Other common names include Air conditioning compressor pulley, Pulley, air conditioning compressor, Air Con Pulley. The part is the same regardless of which name is used.

Does the refrigerant need to be recovered to replace the pulley?

No. The pulley and bearing are external to the refrigerant circuit. You can replace them with the compressor in situ without touching the AC system charge.

Can a seized compressor pulley snap the auxiliary belt?

Yes. A seized pulley bearing generates enormous friction that can strip the belt or cause it to snap. This disables all belt-driven accessories including the alternator and, on many vehicles, the power steering pump.

How do I isolate the AC compressor when diagnosing belt noise?

Temporarily remove the auxiliary belt and spin each pulley by hand. A rough, grinding, or noisy pulley bearing is immediately obvious. Alternatively, run the belt without the AC compressor span using a shorter bypass belt on vehicles where this is possible.

Is pulley replacement a DIY job?

Yes, with a basic clutch hub puller and a press or suitable socket for the bearing. The hardest part is often gaining access to the central bolt — on some engines this requires removing other ancillaries first.

How long do AC compressor pulley bearings last?

Typically 100,000-150,000 miles. Bearings in dusty or corrosive environments fail sooner. A seized bearing that damages the pulley body will require complete pulley replacement rather than bearing-only.

Air Filter Buying GuideSigns of a clogged air filter, paper vs cotton, and how replacing your air filter improves fuel economy.Mass Air Flow Sensor GuideMAF sensor faults — P0100 codes, cleaning tips, and how a faulty MAF affects fuel economy and performance.Brake Master Cylinder Buying GuideSpongy or sinking brake pedal? How to diagnose a failing brake master cylinder, bleed the system, and choose the right replacement.Brake Shoe Set Buying GuideRear drum brake shoes — lining materials, wear limits, self-adjusting mechanisms, and how to replace brake shoes safely.