Description
Jeep Grand Cherokee coolant reservoir
This Jeep Grand Cherokee coolant reservoir is listed for WK models from 2011–2015 with the 3.0L diesel engine. Reference 55037999AJ identifies this listing. Compare the tank shape, hose outlets, cap arrangement and mounting tabs. Confirm the original part and vehicle details before ordering; send your VIN and clear part photos to Parts Factory Australia if you need help.
Ask our team about fitment ↗Reference 55037999AJ. Send our team your exact model, build date and a photo of the original part if you need a fitment check.


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before dispatch.
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More driving.
Australian orders under 500g receive free express postage. Orders weighing 500g or more receive free regular postage. Dispatch is from Queensland; availability and delivery estimates are shown at checkout.
Delivery information ↗Free express postage.
Express delivery is included for Australian orders under 500g.
Free regular postage.
Heavier orders travel by regular post at no delivery charge. See the shipping policy for available options.
Know what to expect.
Check the shipping policy for delivery information, or contact our team before ordering.


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Get to know Parts Factory Australia, then explore our installation tutorials, parts guides and practical tips on YouTube.
Explore our YouTube tutorials ↗Tutorial availability varies by part and vehicle. Check the exact application and follow the product’s professional installation requirements.
Years of replacement cover.
Professional installation and receipts are required.
Read the full warranty terms ↗
Help when you need it.
Contact our team for fitment, delivery or after-sales support. View our 7-day returns policy and conditions ↗
Good questions.
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A few details now can help you choose the right part first time.
Ask us a question ↗How do I check this Grand Cherokee WK diesel expansion tank fits?
For this Grand Cherokee WK diesel expansion tank, confirm WK models from 2011–2015 with the 3.0L diesel engine and compare reference 55037999AJ with the original component. Compare the tank shape, hose outlets, cap arrangement and mounting tabs. Model year alone is not a complete fitment check.
What should I check before fitting the 55037999AJ overflow bottle?
Before fitting the 55037999AJ overflow bottle, have the fault diagnosed and the replacement matched to the vehicle. Have the cooling system checked for leaks and use the specified coolant filling procedure. Professional installation and retained receipts are required for the three-year replacement warranty.
Is it shipped from Australia?
Australian orders under 500g receive free express postage. Orders weighing 500g or more receive free regular postage. Dispatch is from Queensland; availability and delivery estimates are shown at checkout.
Is there a guide for my installation?
Our YouTube channel includes installation tutorials and parts guides. Check for your exact part and vehicle; not every application has a guide. The video on this page introduces our business.
What does the replacement warranty require?
Professional installation and retained receipts are required. Read the warranty terms for the cover, exclusions and claim process.
More parts. Local support.
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