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Persistent Coolant Leak in 2016 Cayenne S - Common Failure Points?

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Mike T. · rep 0 · May 25, 4:54 AM · 1 replies · solved · Question

Vehicle: 2016 Porsche Cayenne S

I've recently started noticing a faint, sweet smell of coolant, and on a few occasions, a small, pinkish puddle under the front of my 2016 Porsche Cayenne S (V6 engine). The coolant reservoir level seems to be dropping slowly over time, which confirms my suspicion of a leak.

I've tried to visually inspect the obvious hoses and connections around the engine bay, but I haven't been able to pinpoint the exact source of the leak. It's not a massive leak, but it's definitely concerning for a vehicle with only about 60,000 miles on it.

Are there any common failure points or notorious areas for coolant leaks on these 958.2 generation Cayenne S models that I should specifically investigate? I'm hoping to get some insight before I have to take it in for a potentially costly diagnosis and repair.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:54 AM

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ClearTheCode admin answer:

Coolant leaks in the 958 generation Porsche Cayenne, particularly with the V6 and V8 engines, are unfortunately not uncommon. Here are several frequent failure points to investigate on your 2016 Cayenne S:

  1. Thermostat Housing and Water Pump: These are common culprits. The plastic components of the thermostat housing can become brittle and crack, leading to leaks. The water pump, being a wear item, can develop leaks from its seal or shaft. Inspect the area directly below the front of the engine for tell-tale coolant residue.
  2. Coolant Pipes/Hoses in the 'Valley': On V6 engines, there are several plastic coolant pipes and hoses located in the 'valley' of the engine (under the intake manifold). These plastic components are prone to cracking and leaking over time due to heat cycling. This often requires intake manifold removal for inspection and repair.
  3. Coolant Crossover Pipe: There's a plastic coolant crossover pipe at the rear of the engine that can also crack and leak. This leak might be harder to spot as it can drip down the back of the engine.
  4. Radiator End Tanks: The plastic end tanks of the radiator can develop hairline cracks, especially where they crimp to the aluminum core. Check the top and bottom corners of the radiator.
  5. Auxiliary Coolant Pump: Some models have an auxiliary coolant pump, which can also be a source of leaks.

When to see a shop:

  • Urgently if the coolant level drops rapidly or if the engine temperature gauge starts to rise above normal. Driving with insufficient coolant can lead to severe engine damage.
  • If you cannot locate the source of the leak yourself, or if it appears to be coming from an inaccessible area (like under the intake manifold).
  • A professional pressure test of the cooling system can quickly identify even small, intermittent leaks that are hard to see visually.
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