Mercedes-Benz CLK320 A/C Compressor Replacement Guide (1998-2005)
Is your CLK320's air conditioning blowing warm? Here’s what you need to know before replacing your A/C compressor.
- The original compressor is likely a Denso; buying a Denso or another OEM supplier brand like Valeo or Mahle is the safest bet for quality.
- You MUST replace the receiver/drier and O-rings when you replace the compressor to ensure longevity and validate the warranty.
- If the old compressor failed internally ('black death'), the entire system must be flushed and the expansion valve replaced to avoid immediate failure of the new part.
- A/C system service requires special equipment to evacuate and recharge refrigerant, making this a difficult job for most DIYers.
Is Your CLK320 A/C Blowing Hot Air?
When the air conditioning in a 1998-2005 Mercedes-Benz CLK320 stops working, the A/C compressor is a common suspect. This part works hard and can wear out over time. A complete failure leaves you without cold air, but there are usually warning signs before it quits completely.
🎬 Watch: How to diagnose a bad compressor on a CLK320Symptoms of a Failing A/C Compressor
Pay attention to these signs. Catching a failure early can sometimes prevent more expensive repairs.
- Warm Air from Vents: The most obvious symptom. Even with the A/C on max, the air is not cold.
- Loud Noises: A grinding, whining, or rattling sound from the engine bay when the A/C is turned on points to internal compressor problems or a bad clutch bearing.
- Compressor Clutch Issues: The clutch on the front of the compressor pulley should engage and spin when you turn on the A/C. If it doesn't move, it could be a bad clutch, a wiring issue, or the system may be low on refrigerant. 🎬 See how to replace the compressor clutch without removing the unit
- Visible Leaks: You might see an oily, greenish substance on or around the compressor body. This is refrigerant oil, indicating a leak in the compressor seals.
Black Death: A Catastrophic Failure
If the compressor fails internally, it can send metal shavings and black, sludgy debris throughout the entire A/C system. This is known as "black death." If this happens, you must replace not only the compressor but also the receiver/drier, expansion valve, and thoroughly flush the entire system. Failure to do so will cause your new compressor to fail immediately.
Choosing the Right Aftermarket A/C Compressor
You don't have to pay dealership prices for a quality A/C compressor. The original compressor in your CLK320 was likely made by Denso. Several aftermarket brands offer reliable replacements, but quality can vary. They generally fall into three tiers.
Tier 1: OEM Supplier Brands
These brands are known to manufacture parts for Mercedes-Benz and other carmakers. They offer the highest quality and best fit, often identical to the dealer part without the high price tag.
- Denso: Widely considered the original manufacturer and the best overall choice for a replacement.
- Valeo & Mahle: Excellent quality European brands that are often original equipment suppliers.
- Bosch: Another trusted German OEM supplier with a strong reputation for quality.
Tier 2: Reputable Aftermarket Brands
These companies specialize in aftermarket parts and offer a good balance of quality and price. They are a solid choice for most repairs.
- Nissens: A well-respected specialist in climate control and engine cooling parts.
- Delphi: A major OEM supplier to many brands, offering quality aftermarket components.
Tier 3: Economy Brands
These brands offer the lowest prices but may have more mixed reviews regarding longevity and fit.
- Four Seasons: A popular aftermarket brand with generally acceptable quality, though some users report issues like incorrect oil levels in new units.
- Global Parts (GPD), UAC: Budget-friendly options, but some mechanics report a higher failure rate compared to Tier 1 or 2 brands.
Pro Tip: Always Buy a Kit
To ensure your new compressor lasts, it is critical to replace other system components at the same time. Many brands offer kits that include the compressor, a new receiver/drier (also called an accumulator), and new O-rings. Replacing these parts is required by most manufacturers to keep the warranty valid.
A/C Compressor Replacement Cost for CLK320
The cost can vary significantly between doing it yourself and having a shop perform the work. A professional replacement is expensive, largely due to the high cost of an OEM part from a dealer.
| Part or Service | Estimated Cost |
|---|---|
| New Aftermarket Compressor | $317 - $660 |
| New OEM Compressor (Dealer) | $1,200 - $2,700 |
| Shop Labor (incl. evac/recharge) | $350 - $900+ |
| Total Professional Job (Aftermarket Part) | $700 - $1,500 |
| Total Professional Job (OEM Part) | $1,600 - $3,500+ |
Frequently Asked Questions (FAQ)
Can I replace the CLK320 A/C compressor myself?
This is a challenging DIY job. While the compressor itself is held on by just a few bolts, accessing it requires removing the engine splash shield and possibly the front bumper. More importantly, you legally need a certified shop to evacuate the refrigerant before you start and to vacuum and recharge the system after you are done. If you are an experienced mechanic with the right tools, it is possible, but for most owners, this job is best left to a professional.
🎬 Watch: Full walkthrough of the compressor replacement and recharge processDo I need to replace anything else with the compressor?
Yes, this is critical. You MUST replace the receiver/drier (also called the accumulator or desiccator) and all the O-rings for the lines you disconnect. Most compressor warranties require this. If the old compressor failed internally, you should also replace the expansion valve to protect the new unit from debris.
What kind of oil does the A/C system use?
The system uses PAG 46 oil. New compressors come with shipping oil that must be drained. You then need to add the correct amount of new PAG 46 oil before installation. The amount needed depends on which parts of the system you are replacing.
Are there any recalls for the CLK320 A/C compressor?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no specific recalls or technical service bulletins (TSBs) for the A/C compressor on the 1998-2005 Mercedes-Benz CLK320.
What is the difference between the W208 and W209 compressors?
The 1998-2005 CLK320 range covers two chassis: the W208 (1998-2003) and W209 (2003-2005). While the 3.2L V6 engine is similar, some parts, including the A/C compressor, can have different part numbers or designs. It is essential to use your vehicle's year and VIN to confirm you are ordering the correct part for your specific model.
Helpful Videos
Technical Specifications
OEM Part Numbers: 0002306511 0002308011 0002308111 0002308511 0002308811 0002309011
Pulley: 6-Groove Clutch, System Oil: PAG 46
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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.
- Mercedes-Benz CLK320:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your CLK320 A/C Blowing Hot Air?
- Symptoms of a Failing A/C Compressor
- Black Death: A Catastrophic Failure
- Choosing the Right Aftermarket A/C Compressor
- Tier 1: OEM Supplier Brands
- Tier 2: Reputable Aftermarket Brands
- Tier 3: Economy Brands
- Pro Tip: Always Buy a Kit
- A/C Compressor Replacement Cost for CLK320
- Frequently Asked Questions (FAQ)
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