BYD Engine Cooling Parts — Two Cooling Systems Inside One Brand

BYD sells combustion, plug-in hybrid and fully electric vehicles under one badge, and it sells them in Europe under names that do not always reveal which is which. That matters more in cooling than almost anywhere else, because cooling is the first place where the two technologies stop sharing parts. A plug-in hybrid sold in Europe as the Seal U DM-i has an engine loop with a thermostat in it. A battery-electric model has a battery loop and a drive-unit loop with electrically driven pumps in them and no thermostat to speak of. Both arrive at the same workshop desk, both present as coolant work, and they do not use the same numbers. In our own BYD index the category that carries these lines runs to thirty-three entries, "Electric Coolant Pump" alone carries five numbers and "Thermostat, Coolant" carries four. This page sets out how to tell the two worlds apart before you order, and why the shelf label on the category is not a technical boundary.

1. What the thirty-three lines actually contain

Two things jump out of that table, and both change how you should search. First, fewer than a third of the lines are coolant-circuit items in the narrow sense. The category also carries seals, gaskets, exhaust hardware, an EGR valve and a spark plug — items that only have meaning on a vehicle with a combustion engine. Second, every one of those combustion-side items sits here rather than in a separate engine category, which means searching a European-style "engine" heading for them will come back empty. The category name is a shelf label, not a technical boundary.

2. The three loops, described only as far as purchasing needs it

You do not need the plumbing to buy the parts, but you do need the shape of it, because the shape decides whether a given line can exist on the car in front of you.

The engine loop is the classical one on any DM-i or combustion model: coolant moved through the block and head, a thermostat controlling when it reaches the radiator, heat rejected at the front of the car. Lines such as the four Thermostat, Coolant numbers belong here and have no counterpart on a vehicle without an engine.

The battery loop is what BYD's battery-electric models add. Their packs are the LFP Blade type with a cell-to-pack structure, and keeping that pack inside its working window is a dedicated circuit with its own pump, its own sensors and its own control logic.

The drive-unit loop covers the electric motor and its reduction gearing, sometimes sharing a circuit with the power electronics and sometimes not.

None of these three necessarily shares a pump, a sensor or a joint with either of the others. That is the whole reason a request written as "the coolant pump for a BYD" cannot be answered.

3. Why "the pump" is ambiguous on BYD

In our index there are five Electric Coolant Pump lines and two more under the label Additional Electric Coolant Pump. Read the two labels literally: the existence of a family named "additional" tells you that some configurations distinguish more than one electric pump position. It does not tell you which one your customer's car has, and the index does not carry that fitment, so we do not state it.

What we can say is that the five mainstream pump numbers are not numerically clustered. They sit at 13039980-00, 13099350-00, 13206366-00, 13641450-00 and 14502808-00, with the two additional-pump lines at 13012862-00 and 14967245-00. Numbers spread across several numeric blocks, all carrying the same English family name, is exactly the pattern you would expect when one part family has been developed separately for several platforms rather than revised sequentially on one platform.

The second layer of ambiguity is electric versus engine-driven. A pump driven off the engine exists only where there is an engine; an electric pump can run with the engine off, which is why it appears on hybrid and electric thermal management. The English names in the data separate them clearly — Electric Coolant Pump versus Additional Electric Coolant Pump — so quote the exact name with the exact number. If your customer describes the symptom rather than the part, get the VIN before you get the quotation.

4. The combustion-only lines, and why they are the trap

This is where European workshops lose the most time. Several families in the data presuppose an internal combustion engine, and asking for them on a battery-electric BYD is a category error rather than a stock question.

Two useful rules follow. A thermostat request implies you have diagnosed a combustion or hybrid model, so confirm which one you have on the ramp. And several coolantside sensors are not filed here at all: Sensor, Coolant Temperature lines 10509783-00, 11261371-00 and 12849640-00 are indexed in the electrics and sensors category, not here. Searching one heading alone will miss lines that belong logically to this circuit.

5. Ordering: what has to be in the enquiry

Because the index carries no model-year fitment, none of the reasoning above can substitute for the two identifiers. Application is confirmed per enquiry against the OE number and the VIN.

Send us the VIN first. It settles the questions you would otherwise argue about: whether the car has an engine loop at all, whether the pump in question is engine-driven or electric, and whether the numeric block matches the vehicle's production position. Then send the number off the label or the casting, including the -00 suffix, which is part of the identifier in this format. Then send the position — pump, thermostat housing, joint — read from the vehicle rather than inferred from the symptom. A photograph of the label costs nothing and settles most arguments on its own.

Where the customer's description is all you have, send us that description plus the VIN, and we will check whether we can source what the number turns out to be. We confirm, part number by part number, whether we can supply it. Remanufactured units can be quoted on request by part number; availability is confirmed order by order. Minimum order value is €50 per shipment; guide prices are shown on the parts pages, and trade and volume pricing on request. Typical dispatch time is confirmed on the quotation; transit depends on the shipping method you choose. If a line is not in the published index, send us the part number or a photo of the label, and we will check whether we can source it. Start from the BYD-compatible parts — OE reference index or the engine cooling category, and use the enquiry page to have a number checked.

Short answers

Does a BYD have a conventional thermostat? Where it has a combustion engine, yes — four Thermostat, Coolant numbers are listed in our index, including 12668319-00 and 17058015-00. The component belongs to the engine loop; we do not state which configuration each number serves.

Why are there seven electric pump numbers? Because coolant has to be moved in more than one circuit, and because the same English family name has been developed across several platforms. Five lines are named Electric Coolant Pump and two Additional Electric Coolant Pump.

Can I use battery-loop reasoning on a DM-i? Not as a shortcut. A DM-i has the engine-loop items — thermostat, EGR hardware, oil-side gaskets — layered on top of whatever electrical thermal management it carries. Identify the car from the VIN, then choose the number.

Why is the sensor I want missing from this category? Because our index files Sensor, Coolant Temperature lines under electrics and sensors. Cooling-related parts are spread across more than one heading, which is why the VIN-plus-number route beats category browsing.

Where this comes from.

The references quoted above are taken from GNSGO's own parts index for BYD vehicles — the same list at BYD-compatible parts — OE reference index. Application is confirmed per enquiry against the OE number and the VIN; the published index does not carry model-year fitment, so we do not infer it here. Model names follow the export designations listed on this page. We have not drawn on BYD's copyrighted workshop documentation, and we do not reproduce any manual or wiring-diagram pages.

This page is general information only. It is not a repair instruction, not a diagnosis of a particular vehicle, and not a substitute for professional advice. Restraint-system and high-voltage parts are outside the scope of this page. Work on high-voltage systems, restraint systems and structural repairs belongs with technicians qualified for it. Confirm the application against the VIN before ordering. Have any work carried out by a suitably qualified workshop.