The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

Coolant Leak and Low Coolant Warning on 2017 Cayenne S

0

Sarah K. · rep 0 · May 25, 4:49 AM · 1 replies · solved · Question

Vehicle: 2017 Porsche Cayenne S

Hello fellow Porsche owners,

I've been having an intermittent issue with my 2017 Porsche Cayenne S. For the past few weeks, I've noticed a faint sweet smell, which I now realize is coolant, especially after the car has been running. More recently, I've started getting 'Low Coolant Level' warnings on the dash, requiring me to top up the reservoir every few days.

I've looked under the hood, but I can't pinpoint an obvious leak. There are no puddles under the car, which makes me think it might be a slow leak or evaporating before it hits the ground. The engine temperature gauge seems normal, but I'm worried about potential overheating or more serious damage if this continues.

Has anyone with a 958.2 generation Cayenne S experienced similar coolant loss issues? Are there common failure points I should be aware of? Any advice on where to look or what this might indicate would be greatly appreciated before I take it in.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:49 AM

0

ClearTheCode admin answer:

Coolant loss in a 2017 Porsche Cayenne S, even without visible puddles, is a serious concern that requires prompt attention. The sweet smell is a classic indicator of an ethylene glycol-based coolant leak. While your temperature gauge may read normal, a slow leak can eventually lead to insufficient cooling and potential engine damage.

Common Causes for Coolant Leaks in Cayenne (958.2 generation):

  1. Plastic Coolant Pipes/Fittings: Porsche, like many manufacturers, uses plastic components in the cooling system. Over time, these can become brittle, crack, or seals can fail, especially in areas subjected to heat and pressure. Common culprits include the 'T' connectors, various hose junctions, and pipes located beneath the intake manifold.
  2. Water Pump: The water pump's seals can fail, leading to a slow drip that might be hard to spot as it often drips onto hot engine components and evaporates. Look for residue or staining around the pump housing.
  3. Thermostat Housing: The housing itself or its gasket can develop leaks. This is often located near the water pump or engine block.
  4. Radiator/Hoses: While less common for intermittent leaks, a pinhole leak in the radiator or a small crack in a rubber hose could be the source. Check all visible hoses for bulging, softness, or hard spots.
  5. Expansion Tank: The coolant expansion tank itself can develop hairline cracks, particularly around the seams or where hoses connect.
  6. Heater Core: A leak in the heater core would typically manifest as a coolant smell inside the cabin, and potentially dampness on the passenger floorboard.

Diagnostics:

  • A pressure test of the cooling system is the most effective way to find elusive leaks. A technician will pressurize the system and then look for drops in pressure or visible leaks.
  • UV dye can be added to the coolant. After driving, a UV light can reveal the exact source of the leak.

When to See a Shop:

  • Immediately: You should take your Cayenne S to a qualified Porsche specialist as soon as possible. Driving with low coolant can lead to engine overheating, which can cause catastrophic damage, including warped cylinder heads, blown head gaskets, or even a seized engine. The cost of repairing an overheated engine far outweighs the cost of fixing a coolant leak. Do not ignore the 'Low Coolant Level' warning.
Menu

Help & account