OEM Automatic Transmission Cooler for 1999-2006 BMW

What to look for when buying this part:

• Compatibility with your specific BMW model year.
• Condition of the cooler (if buying used or refurbished).
• Warranty offered by the seller.
• Price compared to other options.
• Seller's reputation and return policy.

Quality indicators for the available options:

What's typically included with the part:

• The automatic transmission cooler itself.
• Mounting brackets (sometimes).
• Fittings or connectors (sometimes).
• Seals or gaskets (sometimes).

Difficulty level and estimated time:

• Moderate. Requires some mechanical knowledge.
• Estimated time: 1-3 hours.

Special tools needed (if any):

• Socket set
• Wrench set
• Screwdrivers
• Pliers
• Torque wrench
• Transmission fluid (compatible with your BMW)
• Drain pan
• Hose clamps (if needed)

Critical steps and tips:

1. Disconnect the battery: Prevents electrical shorts.
2. Drain the transmission fluid: Use a drain pan to catch the fluid.
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. Connect 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.

Whether DIY is recommended or professional installation is better:

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

Compare: Used OEM, Refurbished OEM, New Aftermarket

Used OEM:

• Best value for money.
• Genuine factory parts, ensuring proper fit and function.
• Tested and inspected to meet quality standards.
• Significantly lower prices than new options.

Refurbished OEM:

• Factory parts professionally restored to like-new condition.
• Rebuilt with new components as needed.
• Offers a balance of quality and value.

New Aftermarket:

• Brand new, third-party parts built to OE specifications.
• Can be a cost-effective alternative to OEM parts.
• Quality may vary depending on the manufacturer.

Parts commonly replaced or checked at the same time:

• Transmission fluid
• Transmission filter
• Transmission cooler lines
• Radiator (if the cooler is integrated)
• Thermostat (if overheating is a concern)

Why replacing related parts prevents repeat failures:

• Replacing the transmission fluid and filter ensures clean fluid and proper filtration.
• Replacing the cooler lines prevents leaks and ensures proper fluid flow.
• Addressing other cooling system issues prevents the transmission from overheating.

How long this part normally lasts:

• 75,000 - 150,000 miles.

Factors that affect longevity:

• Driving conditions (stop-and-go traffic, towing).
• Maintenance habits (fluid changes).
• Climate (extreme heat or cold).
• Quality of the part.

Budget vs mid-range vs premium options:

• Used OEM: $50 - $150
• Refurbished OEM: $100 - $250
• New Aftermarket: $75 - $300

Labor cost considerations if applicable:

• Professional installation: $150 - $400

Total job cost estimates:

• DIY (Used OEM): $50 - $150 (plus fluid)
• DIY (New Aftermarket): $75 - $300 (plus fluid)
• Professional Installation (Used OEM): $200 - $550 (parts and labor)
• Professional Installation (New Aftermarket): $225 - $700 (parts and labor)

Known issues for this vehicle's system related to this part:

• Some models are prone to leaks at the cooler line connections.
• Overheating can be a common problem in certain driving conditions.
• Check for any Technical Service Bulletins (TSBs) related to transmission cooling issues.

Any TSBs or common complaints:

• Research common complaints about transmission overheating for your specific model year.
• Check for TSBs related to transmission cooling system issues.

How to confirm proper operation:

• Check the transmission fluid level.
• Monitor the transmission fluid temperature.
• Check for leaks around the cooler and lines.
• Test drive the vehicle to ensure smooth shifting.

What to look/listen for to verify it's working correctly:

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

Q: How do I know if my transmission cooler is leaking?
A: Look for red or brown fluid near the cooler or on the ground underneath your car. Also, check your transmission fluid level. If it's low, that could be a sign of a leak.

Q: Can I drive my car if the transmission cooler is leaking?
A: It's not recommended. A leaking cooler can cause your transmission to overheat, which can lead to serious damage.

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

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

Q: What kind of transmission fluid do I need for my BMW?
A: Use the type of fluid specified in your BMW's owner's manual. Using the wrong fluid can damage your transmission.

OEM Part Numbers:

• BMW: 17221436258, 17227505826, 7505826

Fits Years: 1999 2000 2001 2002 2003 2004 2005 2006