Coolant Expansion Tank for BYD Song L & Seal 05, OE 12999861-00

Fit on this tank depends on your exact model and build, not just the make. Check the fitment table on this page against the model and model year shown on your registration document before ordering, since closely related BYD models can use a different expansion tank. The OE number 12999861-00 covers confirmed applications, so matching your car there is the surest way to avoid ordering the wrong part. If anything is unclear, use the table to settle it rather than guessing.

If the number stamped on the part you are removing does not match 12999861-00, go with the number on the part in your hand rather than this listing. Read it directly off the old tank before you order, since that is the figure that decides whether the replacement bolts straight in. Do not rely on memory or on what the last tank looked like, read the number itself, as this is the detail that removes any doubt before you commit to an order.

Delivery takes 8 to 25 days from your order to your door. While you wait, check the model and the model year as written on your registration document, since that confirms you are ordering against the right version of your car. Keeping that detail to hand also makes it quicker to sort out anything with us if a question comes up before the tank arrives.

Plastic is what this tank is made from. It carries the OE number 12999861-00 and is also listed under the reference SA3HE-1311020, which is worth having to hand if you are matching this against a parts list or an old invoice. Use whichever number is in front of you, OE or the alternative reference, to confirm this is the tank your car needs before ordering.

Under the bonnet is where this part sits, in the engine bay, fitted as part of the cooling system alongside the other hoses, tanks and sensors. Have a look at the photographs on this page before you order, so you can see exactly where it sits and check the shape and connections against what is currently fitted on your car. If the images do not clearly match what you are looking at under the bonnet, hold off and check further rather than guessing.

This page lists one tier, the Original/Genuine tank, rather than a choice against an Aftermarket copy. That means there is no cheaper alternative to compare it with here, only the question of whether this is the correct tank for your car. Check the OE number 12999861-00 against the marking on your existing tank before ordering. If you are specifically after an Aftermarket priced alternative and cannot see one listed, use the quote route on this page to ask whether one can be sourced.