BMW part number 11 52 1 740 963 (11521740963) is the Fan coupling (cooling system fan fan coupling), a cooling part catalogued for the E34 (520i, 525i). As of our last check (2026-09-28, bmwpartsdeal.com), it has been superseded by 11527505302. Interchange records list it on E36, E46, E39, E38, E53, E36/7 as well. 4 aftermarket options, 1 kit or reman option, 1 repair guide below.
Replaced by 11527505302. Order the newer number.
Each option links to the page that lists it as replacing this BMW number (price as listed on the check date). Tiers marked “brand class” are our classification of the brand, not a test of this part. Aftermarket parts are not BMW parts: quality varies and fitment is not guaranteed.
“Ships internationally” is shown only where we read it on the vendor’s own shipping page (checked 2026-09-28); otherwise check with the vendor. Import duties and taxes are the buyer’s responsibility. Amazon links carry our Associates tag, so we may earn a commission; other seller links are not affiliate links today.
Older numbers on the left, newest on the right. Numbers without a record open a lookup.
Same BMW part number, but the source list is truncated or market-specific. More models may apply.
+23 more models not listed by the source.
No forum workaround recorded yet. If you know a thread, the hunt team wants to hear about it.
No DIY route recorded yet.
Write-ups and videos from owners, forums and specialists on removing and fitting this part. Summaries are ours; follow the link for the full steps, photos and torque values, and credit goes to the original author.
How to spot a failed viscous fan clutch (temperature climbing in traffic, a hot fan that stops easily) and swap it: shock the 32 mm left-hand-thread nut loose with a hammer on the wrench, then move the blade over with its three Allen screws. Also peeks inside the old clutch at its fill hole.
Tools mentioned: 32 mm box wrench, hammer, Allen keys
Successor 11527505302 listed at $314.57 on bmwpartsdeal (InStock).
Live eBay listings are coming soon. Until then, search eBay directly for this number with the links below.