Genuine Porsche Thermo-Pneumatic Control Valve PAB121678A

Product Overview

The Genuine Porsche Thermo-Pneumatic Control Valve PAB121678A is the original coolant shut-off valve assembly for Porsche models powered by the EA839 2.9 litre and 3.0 litre V6 engines. Working with the water pump circuit, this valve uses engine vacuum and coolant temperature to open and close a coolant path, which lets the engine warm up faster from cold and then run at its full designed cooling capacity once up to temperature. Faster warm-up means lower cold-running wear, better emissions control, and cabin heat sooner on a cold morning.

The assembly is supplied as Porsche delivers it, including the gaskets, housing, and thermostat components noted in the factory catalogue listing. It is a known service item on these engines: when the valve ages, coolant can weep from the valve area and, in documented cases, migrate toward the vacuum system shared with the water pump, so prompt replacement with the genuine assembly protects far more expensive components downstream. This listing is for the genuine Porsche part, cross-referenced to the earlier number 9A712167800.

Part Numbers & Reference Codes

OE part number: PAB121678A, also written PAB 121 678 A or PAB-121-678-A. Related and superseded references include 9A712167800 and the base number PAB121678. If your catalogue, estimate, or old invoice shows 9A712167800, this is the current genuine assembly to order. Always verify by the OE part number and share your VIN with our parts team, and we will confirm the valve listed for your exact model and engine before dispatch. Ordering the correct assembly first time also avoids opening the cooling system twice for one repair, which saves labour, coolant, and workshop time on every job.

Vehicle Compatibility & Fitment

This thermo-pneumatic valve fits Porsche models with the EA839 V6 petrol engines: the Panamera (971) from 2017, the Cayenne (9YA) from 2018, and the Macan (95B.2), including the Macan S with the 3.0 litre V6. The engines covered are the 2.9 litre twin-turbo V6 and the 3.0 litre turbocharged V6. The full breakdown is set out in the Fitment Details tab on this page. Because the valve belongs to a specific cooling circuit layout, VIN verification before ordering is essential.

Key Features & Benefits

• Complete genuine assembly: supplied including gaskets, housing, and thermostat components, as listed in the Porsche catalogue.
• Faster, cleaner warm-up: shuts off a coolant path when cold so the engine reaches operating temperature quickly, reducing cold wear.
• Factory vacuum control: thermo-pneumatic operation matched to the EA839 cooling strategy, with no coding or adaptation substitutes needed.
• Protects the vacuum system: replacing a weeping valve early guards the water pump and vacuum circuit against coolant migration.
• Current factory number: cross-referenced to 9A712167800, so you receive the correct current genuine part.

Technical Specifications

Installation Position & Fitment Notes

The valve sits in the engine cooling circuit in the water pump group, diagram position 19 in Porsche parts illustrations for these models. It is plumbed into the coolant hoses and connected to the engine vacuum system, which is what actuates it. The factory notes for this part state that it cannot be reused once removed and that its associated O-rings must be replaced during installation, so plan the job as a one-time fitment with fresh seals. Access is tight in the engine bay of the Panamera, Cayenne, and Macan, and the cooling system must be drained, refilled, and bled correctly afterwards.

Product Brand, Type & Condition

Brand: Porsche. Type: thermo-pneumatic coolant control valve assembly for the engine cooling system. Condition: brand-new genuine OEM part, supplied exactly as Porsche produces it, complete with the gaskets, housing, and thermostat components included in the factory assembly. It is not a delete kit, bypass, or aftermarket substitute.

What’s Included in the Box

This listing includes one (1) Genuine Porsche Thermo-Pneumatic Control Valve assembly, OE part number PAB121678A, including the gaskets, housing, and thermostat components supplied with the factory assembly. Associated O-rings that the factory requires to be renewed during installation, coolant, and any hoses your technician judges worn are separate items and are not included in this listing.

Installation Requirements

Professional installation by a qualified Porsche technician is strongly recommended. The cooling system must be drained, the valve exchanged with new O-rings, the vacuum connection checked for coolant contamination, and the system refilled and bled to the workshop procedure. If coolant has already leaked from a failed valve, the technician should inspect the water pump and vacuum lines before returning the car to service, because coolant migration can damage components beyond the valve itself.

Warranty & Returns

This brand-new genuine part is covered against manufacturing defects, and your statutory consumer rights apply in the UAE. If the part arrives damaged or is incorrect due to our error, we will replace or refund it. Please keep the part in its original condition and packaging until fitment is confirmed, and contact us promptly if anything about the delivery does not match your order.

Confirm Fitment & Order

Ready to order? Order the Genuine Porsche Thermo-Pneumatic Control Valve PAB121678A from European Autospares Trading LLC, with fast delivery across the UAE. Not sure it fits your car? Contact us with your VIN and our parts team will confirm fitment before you buy. You can also browse genuine engine parts or browse genuine Porsche spare parts for related genuine parts for your vehicle.