Radiator Cooling Fan for BMW 135i, 335i, 335d, 335is, 335xi, X1 & Z4 (2007-2016)

Radiator Cooling Fan for BMW 135i, 335i, 335d, 335is, 335xi, X1 & Z4 (2007-2016)

This is an electric radiator cooling fan assembly, cross-referenced to OE numbers 17427545366, 17427801647, 17427788907, 623430, and 620981, built to fit a wide range of BMW models spanning the 135i, 335i, 335d, 335is, 335xi, X1, and Z4. If your BMW has started running hotter than usual at idle or in stop-and-go traffic, a failing cooling fan is a common and well-documented cause across this engine family.

Why the Cooling Fan Matters on These BMWs

At highway speed, airflow through the grille does most of the work of cooling your radiator, but at idle and low speeds, the electric cooling fan is what keeps coolant temperatures in check. When this fan weakens or fails, the first symptoms often show up specifically in traffic or at stoplights, since that's exactly when the fan is doing the most work and airflow from driving isn't there to help.

Key Features

• Cross-referenced to OE numbers 17427545366, 17427801647, 17427788907, 623430, and 620981
• 7-blade design engineered for efficient airflow over the radiator
• Built to OE specifications for reliable, long-lasting operation
• Engineered for quiet operation, rated at 84 dB or below

Specifications

• Type: Electric radiator cooling fan assembly
• Material: Plastic
• Number of fan blades: 7
• Terminal: 4-pin connector
• Maximum rotational speed: 2,250 RPM or greater
• Wattage: 600W
• Manufacturer warranty: 1 year
• Condition: New

Compatibility

Built to fit the BMW 135i (2008-2013), 335d (2009-2011), 335i (2007-2013), 335is (2011), 335xi (2007-2008), X1 (2013-2015), and Z4 (2009-2016). Because this fan spans multiple BMW model years and engine variants, it's worth confirming the OE numbers above against your original fan or reaching out with your VIN before ordering to help guarantee a correct fit.

Signs Your Cooling Fan Is Failing

A temperature gauge that climbs specifically in traffic or at idle but stays normal on the highway, a fan that doesn't come on when the engine reaches operating temperature, or a grinding or rattling noise from the fan assembly are all common signs of a failing cooling fan. Because this pattern of overheating only under low-airflow conditions is so specific, it's one of the more identifiable cooling system symptoms rather than a vague warning sign.

Why Replacing a Failing Fan Promptly Matters

Persistent overheating, even if it only shows up occasionally in traffic, puts stress on your engine, head gasket, and other cooling system components every time it happens. Replacing a weak or failed cooling fan before it leads to a full overheating event helps you avoid a much larger repair bill and keeps your BMW's engine running at the temperature it was designed for. It's a relatively affordable fix compared to the cost of repairing a warped cylinder head or a blown head gasket after a genuine overheating event.

Installation Notes

Installing this fan means removing the front fascia or working from above the engine bay depending on your specific model, disconnecting the factory electrical connector, unbolting the fan shroud assembly, and installing the new fan in its place before reconnecting the wiring. Because this job often involves accessing tight engine bay space, having your vehicle's specific service information on hand makes the process considerably smoother. Professional installation is worth considering given the complexity of accessing this component on some models. Once the new fan is installed, running the engine up to operating temperature while watching the temperature gauge is a simple way to confirm the fan is cycling on and cooling the system as expected.

Ordering Information

This cooling fan is in stock and ships ready to install. Our Shipping Information page covers current timelines, and our Warranty and Returns pages explain what to do if anything isn't right on arrival. Not sure this matches your specific BMW model and year? Our Request a Part page is the fastest way to confirm before you order.

Related Parts

This cooling fan is listed in our BMW collection, along with our Cooling System collection, where you'll find other radiator and cooling components.