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<h2>What is a fan clutch in the car?</h2>
A&nbsp;fan clutch is a quietly efficient and essential player within the cooling system of the vehicle. Positioned between your car's engine and the radiator fan, its primary task is to manage the fan's speed to control engine temperature effectively.
When the engine begins to heat up due to the demands of driving or environmental conditions, the fan clutch senses this temperature rise. It responds by engaging and allowing the radiator fan to spin at a faster rate. This action pulls in more air through the radiator, performing a crucial role in cooling down the engine.&nbsp;Now, when the engine cools down, perhaps during highway cruising or after shutting off the vehicle, the fan clutch disengages. This reduces the fan's speed or stops it altogether, which conserves engine power and contributes to improved fuel efficiency.
<h2>Bad fan clutch symptoms</h2>
Notice a few things&nbsp;to check if your fan clutch gets lazy or sick:
<ul>
<li>Overheating: If your car gets too hot, especially in traffic, the fan clutch may not be cooling the engine properly.</li>
<li>Loud noise: A noisy fan when it's not supposed to be could mean the fan clutch is acting up.</li>
<li>AC weakness: If your AC isn't as cool as usual, blame the fan clutch for reduced airflow.</li>
<li>Temperature fluctuations: Unusual temperature gauge swings can indicate a problematic fan clutch.</li>
<li>Leaks or damage: Fluid leaks or physical damage on the fan clutch are bad signs.</li>
<li>Traffic heat: If your car overheats in traffic but cools down on the open road, the fan clutch might be slacking.</li>
<li>Easy fan spin: Fan blades that spin too easily suggest a lazy fan clutch.</li>
</ul>
<h2>Fan clutch replacement</h2>
If you're experiencing issues with your car's fan clutch, it might be time for a replacement. Keep in mind that this job can be a bit tricky, so it's usually best left to a professional mechanic. However, if you're a seasoned DIY enthusiast and have the necessary tools, here's a general idea of how it's done:
<ol>
<li>Ensure safety: Park on level ground with the engine off.</li>
<li>Drain coolant (if needed): Place a drain pan, open the radiator drain valve, and collect coolant.</li>
<li>Remove fan shroud: Use tools to detach the shroud if required.</li>
<li>Loosen fan clutch nut: Use a holding tool or wrench to loosen the nut counterclockwise.</li>
<li>Take out the fan and clutch assembly: Carefully remove it from the engine.</li>
<li>Install the new fan clutch: Hand-tighten the nut, then torque it to the manufacturer's specs.</li>
<li>Reattach the fan shroud: Secure it with bolts or clips.</li>
<li>Refill coolant (if drained): Top off the radiator with fresh coolant.</li>
<li>Test it: Start the engine and ensure the new fan clutch is working correctly, maintaining a normal engine temperature.</li>
</ol>

Fan Clutch

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

BMW 735i Fan Clutch