Parts for your 2017 Volkswagen Amarok-Thermostat

2017 Volkswagen Amarok Thermostat — What it does and when to service it

Short answer: the 2017 Volkswagen Amarok does use a thermostat. This is documented in Volkswagen’s technical literature for both the V6 TDI (EA897) and 2.0 TDI engines, where a coolant thermostat is specified in the cooling system and covered in the removal/installation procedures.

• Volkswagen erWin/ELSA Workshop Manual: Amarok 2017 — Engine cooling, “Thermostat, removing and installing”.
• Volkswagen Self-Study Programme for the 3.0l V6 TDI (EA897) — cooling system overview and thermostat function.
• Volkswagen Self-Study Programme for the 2.0l TDI (EA189/EA288) — thermostat design and operation.

The Amarok’s thermostat is a small but mighty bit of kit, keeping the diesel humming at its ideal operating temperature. By staying closed when the engine’s cold, it speeds up warm-up, which reduces wear, sharpens fuel economy, and gets the heater working quicker on a frosty morning. Once the coolant’s up to temp, it opens to let flow through the radiator, holding the needle steady under all sorts of loads and Aussie–Kiwi weather. On V6 TDI models the thermostat is integrated in a housing and works with the Amarok’s smart cooling layout, 2.0 TDI variants use a conventional wax-type unit in a similar housing.

There’s no fixed replacement interval, but a crook thermostat will make itself known. Classic signs include slow warm-up or a temp gauge that sits low (stuck open), poor heater performance, rising temps in traffic or under tow (stuck closed), surging temperature, radiator fans running their heads off, and a stored fault like P0128. If any of that rings a bell, it’s time to test and likely replace.

When replacing, always fit a quality, correct-spec thermostat and a new O-ring. Clean the mating surfaces and torque the housing bolts to spec — no silicone goop unless the manual specifically calls for it. Top up with the right VW TL 774-spec coolant (G13 or the later compatible G12evo), mixed with demineralised water to about 50/50 for most climates. Avoid mixing unknown coolant types, if you’re changing type, flush thoroughly.

Bleeding matters. A vacuum fill tool is ideal, but if you’re doing it the old-fashioned way, set the heater to HOT, run the engine, squeeze the upper hose to burp air, and keep the expansion tank topped to the mark. Recheck the level cold over the next few drives and keep an eye for any seepage around the housing.

Good preventative practice is to pair thermostat replacement with other cooling jobs. If your 2.0 TDI is in for a timing belt and water pump, it’s smart to do the thermostat while you’re there. V6 TDI models often get the thermostat done alongside water pump or cooling hose refreshes around higher kilometres.

FAQs

Where is the thermostat on a 2017 Amarok?
The thermostat sits in a housing on the front of the engine. On the V6 TDI it’s integrated near the coolant pump assembly, on 2.0 TDI models it’s mounted at the front of the block. Access varies by engine — some trims may require moving intake ducting or the alternator bracket to get clear access.

What are the common symptoms of a failing Amarok thermostat?
Slow warm-up, a temp gauge that won’t reach normal, lukewarm cabin heat, overheating in traffic or while towing, and fluctuating temps are the big clues. You may also see a check engine light with a code like P0128. Any of these warrant testing and likely replacement to avoid bigger headaches.

What coolant should be used after thermostat replacement?
Use VW-approved coolant to TL 774 spec — typically G13 (purple) or the later G12evo — mixed with demineralised water. A 50/50 blend suits most Aussie and Kiwi conditions. Don’t mix unknown coolants, if switching types, flush the system completely before refilling.