Dayco Accessory Drive Belt Tensioner Assembly 89387
Dayco Accessory Drive Belt Tensioner Assembly 89387 - view 2
Dayco Accessory Drive Belt Tensioner Assembly 89387
Dayco Accessory Drive Belt Tensioner Assembly 89387 - view 2

Dayco Accessory Drive Belt Tensioner Assembly P/N:89387

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$93.99
MPN: 89387
Item Package Quantity: 1
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Dayco Accessory Drive Belt Tensioner Assembly P/N:89387
Dayco Accessory Drive Belt Tensioner Assembly P/N:89387
$93.99

Keep the air-conditioning accessory belt properly tensioned with the Dayco Accessory Drive Belt Tensioner Assembly 89387. It installs as a direct-fit replacement for the 2004-2009 Cadillac CTS, 2004-2009 Cadillac SRX, and 2005-2011 Cadillac STS, in the air-conditioning belt-drive position.

This spring-loaded tensioner assembly applies constant force to the accessory drive belt through its arm and pulley, taking up slack so the belt stays seated on the pulleys as engine speed and load change.

  • Air-conditioning position: serves the A/C accessory belt drive on the listed Cadillac applications.
  • Spring-loaded arm and pulley: maintains steady belt tension to help keep the accessory belt tracking correctly.
  • Assembly: supplied as a complete tensioner assembly for the listed applications.

Worn or weak tensioners are a common source of belt squeal, belt flutter, or a rattle from the accessory drive. If a failed tensioner is the cause of those signs, this unit replaces it; diagnose the cause before replacing.

Interchange: 38419 · 49389 · 49390 · 38418 · 999689A · 999690A · Manufacturer part number 89387

This part cross-references / interchanges with the following part numbers:

38419, 49389, 49390, 38418, 999689A, 999690A, 12577655

Frequently Asked Questions

What does this tensioner do?

It uses a spring-loaded arm and pulley to apply constant tension to the air-conditioning accessory drive belt, keeping the belt seated on the pulleys as engine load and speed change.

Which vehicles does the Dayco 89387 fit?

It is a direct-fit replacement for the 2004-2009 Cadillac CTS, 2004-2009 Cadillac SRX, and 2005-2011 Cadillac STS. See the Buyer's Guide tab to confirm your vehicle.

Where is this tensioner located?

This unit serves the air-conditioning accessory belt drive on the listed Cadillac applications.

What are signs my tensioner may need replacing?

Belt squeal, belt flutter, or a rattle from the accessory drive can be signs of a worn tensioner. Diagnose the cause first, since these symptoms can have other sources.

What interchange numbers does this part replace?

It cross-references 38419, 49389, 49390, 38418, 999689A, and 999690A. Its own manufacturer part number is Dayco 89387.

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