2017-2023 GMC Acadia Radiator Upper Mounting Bracket: Identifying Rattles and Replacement
A quick guide to diagnosing, sourcing, and replacing the simple but crucial brackets that hold your Acadia's radiator in place.
- The radiator upper mounting brackets for the 2017-2023 Acadia are side-specific, with different part numbers for the driver (LH) and passenger (RH) sides.
- The most common symptom of a failed bracket is a rattling noise from the front of the engine bay when going over bumps.
- Replacement is extremely easy and takes less than 30 minutes with basic hand tools, making it an ideal DIY repair.
- Driving with a broken bracket is possible, but it should be fixed promptly to prevent long-term vibration from damaging the radiator itself.
Symptoms of a Failing Radiator Upper Bracket
Failure of the radiator upper mounting bracket is most common after a minor front-end collision or due to long-term metal fatigue. The symptoms are often subtle and may be mistaken for other issues.
- Rattling or Clunking Noises: The most common symptom is a metallic rattle or a light clunking sound coming from the front of the engine bay. This noise is most noticeable when driving over bumps or on rough roads as the unsecured radiator moves up and down.
- Visible Radiator Movement: With the engine off, you can open the hood and gently push on the top of the radiator. If it moves back and forth more than a fraction of an inch, the brackets may be broken, loose, or missing.
- Physical Damage: A visual inspection may reveal a cracked, bent, or heavily rusted bracket. The mounting points on the radiator support or the bracket itself can also break. 🎬 See how to replace a damaged radiator support
Pro Tip: A broken radiator bracket itself will not cause the engine to overheat immediately. However, the resulting vibration and movement can put stress on the radiator's inlet and outlet necks or the coolant hoses, potentially causing a leak over time. Addressing a broken bracket early is a cheap insurance policy against a much more expensive radiator replacement.
🎬 Watch: How to replace the radiator on a GMC AcadiaBuying a Used Radiator Upper Mounting Bracket
For a simple, non-wear part like a steel bracket, a used OEM component is an excellent, cost-effective choice. The original GM part has guaranteed fitment and material quality, often superior to cheap aftermarket alternatives. Here’s what to check before buying.
1. Verify the Correct Side
Unlike some components, these brackets are side-specific. There is a unique part for the driver's side (left) and the passenger's side (right). Ensure you are purchasing the correct one for your needs.
- Driver (Left) Side OEM Part #: 23342339 or 84152505
- Passenger (Right) Side OEM Part #: 23342340 or 84152504
2. Physical Inspection
When inspecting a used bracket, look for the following:
- No Cracks or Bends: Check the entire bracket, especially around the bolt holes and bends, for any signs of stress cracks or deformation. A bent bracket will not align properly.
- Check the Bolt Holes: Ensure the bolt holes are round and not elongated or damaged. This indicates the bracket was held securely and wasn't rattling around.
- Surface Rust: Minor surface rust is purely cosmetic and can be easily cleaned or painted over. However, avoid any brackets with deep, flaking rust that compromises the metal's structural integrity.
Known Issues, TSBs, and Recalls
As of this writing, there are no specific recalls or Technical Service Bulletins (TSBs) from General Motors related to the failure of the radiator upper mounting brackets for the 2017-2023 GMC Acadia. Failures are typically isolated incidents resulting from physical damage or corrosion rather than a widespread manufacturing defect.
Replacement Overview & Difficulty
Replacing these brackets is a very straightforward job, suitable for any DIY skill level.
- Difficulty: 1 out of 5
- Estimated Time: 15-20 minutes
- Tools Required: Ratchet with a 10mm socket, trim panel removal tool (optional).
The process involves removing the plastic radiator sight shield that covers the top of the radiator support. This is typically held in with plastic push-pins. Once the shield is off, each bracket is exposed, secured by two 10mm bolts. Simply unbolt the old bracket and bolt the new one in its place.
Warning: Always perform this work on a cool engine to avoid any risk of burns from the radiator or other engine components.
Cost Comparison
The cost to replace a radiator upper mounting bracket is very low, especially if you do it yourself.
| Part/Service | Estimated Cost | Notes |
|---|---|---|
| New OEM Bracket | $20 - $35 (per side) | Purchased from a GM dealer or online OEM parts retailer. |
| New Aftermarket Bracket | $15 - $30 (per side) | Available from various online auto parts stores. Quality may vary. |
| Used OEM Bracket | $15 - $30 (per side) | A cost-effective option with guaranteed OEM fit. |
| Shop Labor Cost | $50 - $100 | Most shops will charge their minimum fee, typically 0.5 hours of labor. |
Frequently Asked Questions (FAQ)
Can I drive with a broken radiator upper bracket?
Yes, for a short time. The vehicle is drivable, but you should avoid rough roads. The main risk is that prolonged vibration can cause the radiator itself to fail, leading to a much more serious and expensive repair. It's best to replace the bracket as soon as possible.
Is the driver's side bracket the same as the passenger's side?
No, they are not the same. They are mirror images of each other and have different part numbers. Be sure to order the specific side you need. The driver's side is Left (LH) and the passenger's side is Right (RH).
Do I need to drain the coolant to replace this bracket?
No. The bracket is mounted externally on the radiator support structure. The cooling system does not need to be opened or drained for this repair.
Will a broken bracket cause my 'Check Engine' light to come on?
No, a broken bracket itself will not trigger a check engine light as it is a simple mechanical part with no sensors. However, if the resulting movement causes a coolant leak and the engine overheats, that could trigger a warning light for an engine coolant temperature issue.
Helpful Videos
Technical Specifications
OEM Part Numbers: 23342339 (Driver Side, Left) 84152505 (Driver Side, Left) 23342340 (Passenger Side, Right) 84152504 (Passenger Side, Right)
Material: Stamped Steel
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- GMC Acadia: