Shop by Make About Us Track Order
Contact Us
USA Flag
SUPPORT
SMALL BUSINESS
📦 My Cart
- OR -
Automatic Transmission Oil Cooler
This photo shows the same type of part you'll receive. Since each used part has its own wear and scratches, yours may look slightly different. Check the product notes for details about the condition of this specific part.

2009 - 2016 BMW Z4 Automatic Transmission Cooler (OEM)

Only 1 left in stock
$109.95

ℹ️ Product Notes

This is a used part. It is an auxiliary transmission oil cooler for vehicles with a 3.0L engine.

Fits automatic transmission models only. Check your old part for matching hose connection points before buying.
Condition: Excellent (A)
Like new, minimal to no wear
121,770 miles
Odometer reading when part was removed
See Other BMW Z4 Automatic Transmission Oil Coolers
SKU #
9373051-70S1MB.414

Why Buy Used OEM Parts?

✓ Quality-Verified: Every used OEM part we sell has been professionally inspected and tested to ensure it meets our quality standards. While it may show some cosmetic wear from previous use, it's fully functional and ready to install.

✓ Original Equipment: This is a genuine OEM (Original Equipment Manufacturer) part - the exact same part that came with your vehicle from the factory. It's designed specifically for your make and model, ensuring perfect fitment and performance.

✓ Works Like New: Despite some visual wear, this part will perform just as well as a brand new one. The internal components and functionality are intact, giving you the same reliability you'd expect from OEM quality.

✓ Significant Savings: Save 50-80% compared to buying new! Used OEM parts offer exceptional value - you get factory quality at a fraction of the cost. It's the smart choice for budget-conscious vehicle owners who won't compromise on quality.

✓ Risk-Free Purchase: We stand behind our used parts with a generous 6-month warranty, 30-day returns, and 100% money-back guarantee. If it doesn't work out for any reason, simply return it for a full refund. You have nothing to lose!

🛡️ 30-Day Returns + 6-Month Warranty - Buy with Confidence!

Wrenchy the Robot

Meet Wrenchy - The Amazing Parts Assistant!Meet Wrenchy
The Amazing Assistant!

Let Wrenchy help you confirm if this is the right part.

Ask Wrenchy -
Type or Speak! 🎤

Vehicle Fitment Guide

This part fits the following vehicles:

BMW
Z4 2009-2016 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
3.0si Convertible 2009 - 2010 L6 3.0L RWD | Automatic | 3.0L models only
sDrive30i Convertible 2009 - 2011 L6 3.0L RWD | Automatic | 3.0L models only
sDrive35i Convertible 2011 - 2013 L6 3.0L Turbo RWD | Automatic | 3.0L models only
sDrive35i Convertible 2011 - 2013 L6 3.0L RWD | Automatic | 3.0L models only
M Sport Convertible 2014 - 2016 L6 3.0L RWD | Automatic | 3.0L models only

⚠️ Important: Please verify your vehicle's year, make, model, and specifications before ordering. If you're unsure about fitment, contact our customer service team for assistance.

Policies

Shipping & Handling

  • Standard shipping: 3-7 business days via UPS Ground
  • Parts are carefully packaged to prevent damage during transit

Returns (30 Days)

We accept returns within 30 days of delivery for this part.

  • Defective parts: We will replace the part or issue a refund at our discretion
  • Electronic parts: Must be returned with the sealed inspection bag unopened. The clear bag allows full visual inspection before opening. Once opened, electronic parts can only be exchanged for a replacement if defective — no refunds
  • Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
  • Return shipping: We cover return shipping as part of our 100% money-back guarantee
  • Parts must be returned in original packaging and unmodified condition
  • Poorly packaged returns that arrive damaged will not be credited

6-Month Warranty

All used parts include a 6-month warranty from the date of purchase.

  • If your part fails within 6 months, we will send a replacement
  • Refunds are only issued if we cannot provide a suitable replacement
  • Warranty covers defects — not installation errors, misuse, or damage after installation

Note: Warranty is for replacement, not refund. A part failing on day 80? We'll replace it. But the return window for refunds is 30 days.

Damaged in Shipping?

If your part arrives damaged:

  • Stop immediately — do not install the part
  • Keep all original packaging and boxes
  • Take clear photos of the damage and packaging
  • Contact us within 48 hours of delivery

We will handle the carrier claim. You are not responsible for shipping damage — we just need your help documenting it.

Order Cancellation

Orders can be cancelled before shipment for a full refund. Once shipped, cancellations follow our return policy.

Symptoms & Diagnosis

Warning Signs Your Automatic Transmission Cooler Is Failing

  • Transmission slipping or harsh shifting
  • Overheating transmission
  • Transmission fluid leaks (often reddish-brown) near the cooler
  • Whining or unusual noises from the transmission
  • Check engine light illuminated (related to transmission temperature)

How to Test If This Part Is the Problem

  1. Check Transmission Fluid Level: Low fluid can mimic cooler problems. Add fluid if needed and retest.
  2. Inspect the Cooler: Look for physical damage, leaks, or corrosion.
  3. Pressure Test: A mechanic can pressure test the cooler to check for leaks.
  4. Temperature Check: Use an infrared thermometer to compare the temperature of the cooler inlet and outlet hoses. A significant difference may indicate a blockage.
  5. Bypass Test: A mechanic can bypass the cooler to see if transmission performance improves. This is a diagnostic step, not a long-term fix.

Common Failure Causes

  • Corrosion from road salt and debris
  • Physical damage from accidents or road hazards
  • Internal blockage due to debris or sludge buildup
  • Leaks due to worn seals or cracks

Buyer's Checklist

What to Look For When Buying This Part

  • Compatibility with your vehicle's year and model.
  • Condition of the cooler (especially for used parts).
  • Presence of any damage or corrosion.
  • Proper fittings and connections for your vehicle.

Quality Indicators

FeatureUsed OEMRefurbished OEMNew Aftermarket
OriginGenuine factory partGenuine factory partThird-party manufacturer
InspectionThoroughly inspected for damage and leaksInspected and restored to working conditionBrand new
RestorationCleaned and testedMay include replacement of worn componentsN/A
WarrantyTypically a limited warrantyTypically a warrantyTypically a warranty
PriceGenerally the most affordable optionMid-range priceCan vary widely, often mid-range or slightly higher

What's Typically Included

  • The transmission cooler itself.
  • Mounting brackets may or may not be included (check the product description).
  • Fittings and connectors may or may not be included (check the product description).

Installation Overview

Difficulty Level and Estimated Time

  • Difficulty: Intermediate
  • Estimated Time: 2-4 hours

Special Tools Needed

  • Socket set and wrenches
  • Screwdrivers
  • Pliers
  • Torque wrench
  • Fluid drain pan
  • Transmission fluid

Critical Steps and Tips

  1. Disconnect the Battery: This prevents electrical shorts.
  2. Drain the Transmission Fluid: Catch the fluid in a drain pan.
  3. Disconnect the Cooler Lines: Be careful not to damage the lines.
  4. Remove the Old Cooler: Unbolt or unclip the cooler from its mounting location.
  5. Install the New Cooler: Securely mount the new cooler.
  6. Reconnect the Cooler Lines: Ensure the connections are tight and leak-free.
  7. Refill the Transmission Fluid: Use the correct type and amount of fluid.
  8. Check for Leaks: Start the engine and inspect for leaks around the cooler and lines.

DIY or Professional Installation?

  • DIY is possible for mechanically inclined individuals.
  • Professional installation is recommended if you are not comfortable working on your car's transmission system. Improper installation can damage the transmission.

Buying Options

Compare: Used OEM, Refurbished OEM, New Aftermarket

| Option | Pros | | Used OEM | Best value, genuine factory part, tested and inspected, significantly lower price 6. Used OEM: Best value - genuine factory parts, tested and inspected, at significantly lower prices

  • Refurbished OEM: Factory parts professionally restored with new components
  • New Aftermarket: Brand new third-party parts built to OE specs

Typical Lifespan

  • The typical lifespan of an automatic transmission cooler is 5-10 years or 100,000-150,000 miles.

Factors That Affect Longevity

  • Driving habits (frequent towing or aggressive driving can shorten lifespan)
  • Environmental conditions (road salt and extreme temperatures can accelerate corrosion)
  • Maintenance (regular transmission fluid changes can help prevent blockages)

Price Ranges

  • Used OEM: $50 - $150
  • Refurbished OEM: $100 - $250
  • New Aftermarket: $80 - $300
  • Labor Cost: $150 - $400 (depending on the mechanic and location)
  • Total Job Cost: $200 - $700+

Vehicle-Specific Notes

  • Some 2006-2016 BMW models are known to have issues with transmission fluid leaks around the cooler lines.
  • Check for any Technical Service Bulletins (TSBs) related to the transmission cooler on your specific model. Some models may have updated cooler line designs to address leak issues.

Verification After Install

How to Confirm Proper Operation

  • Check the transmission fluid level after driving for a short distance.
  • Monitor the transmission temperature gauge (if equipped).
  • Observe shifting performance for smoothness and responsiveness.

What to Look/Listen For

  • No transmission fluid leaks around the cooler or lines.
  • No unusual noises from the transmission.
  • Normal transmission temperature.
  • Smooth and consistent shifting.

FAQ

Q: How do I know if my transmission cooler is leaking?
A: Look for reddish-brown fluid leaks near the front of your car, especially around the radiator area. You may also notice transmission slipping or overheating.

Q: Can I drive with a leaking transmission cooler?
A: It is not recommended. A leaking cooler can lead to low transmission fluid levels and overheating, which can cause serious damage to your transmission.

Q: How often should I change my transmission fluid?
A: Refer to your vehicle's owner's manual for the recommended service interval. Generally, it's recommended every 30,000-60,000 miles, but this can vary.

Q: Is it hard to replace a transmission cooler myself?
A: Replacing a transmission cooler requires some mechanical knowledge and tools. If you are not comfortable working on your car's transmission system, it's best to have a professional do it.

Q: Will a new transmission cooler improve my car's performance?
A: A properly functioning transmission cooler will help maintain optimal transmission temperature, which can improve shifting performance and extend the life of your transmission.

Part Specifications

OEM Part Numbers:

  • BMW: 17217529499, 17217551647, 17217553388

Fits Years: 2009 2010 2011 2012 2013 2014 2015 2016

Why Millions Choose Go-Parts

Your Go-To Place for Auto Parts!

✅

6-Month Warranty

Shop with confidence and peace of mind

🏆

Trusted Since 2007

Over 19 years of excellence

🏅

OEM Quality

Meets or exceeds OE standards

🚚 Fast Shipping • ↩️ 30-Day Returns • 🎯 Perfect Fit Guaranteed

Racing Partner Videos

×

Search by Vehicle

1
2
3