Coolant Leaks in Porsche Engines

Owners have noticed coolant leaking from the thermostat housing, intake manifold, water pump, and busted coolant pipes.

Coolant leaks are bad for your engine. Hopefully this doesn’t surprise any of you. Antifreeze can mix with your car’s oil and create a toxic hell-stew that kills your engine. It can strip your combustion chambers of their oil and create excess heat and wear. It can also make a terrible mess of your driveway or garage.

Let’s look at some of the most common areas where coolant leaks happen in Porsche vehicles.

The Coolant Hose Slip

In 2014, the National Highway Traffic Safety Administration (NHTSA) opened an investigation into claims that a coolant hose fitting can disconnect from the engine block sending all the engine’s coolant spewing out in a moment that would make Old Faithful jealous.

The investigation was closed because NHTSA couldn’t tie any injuries or accidents directly to the problem and they said Porsche fixed the problem.

Try telling it to owners like this 2014 911 owner who said his hose disconnected at just 636 miles.

The Coolant Pipe Burst

Porsche was sued 8 times for using plastic coolant pipes that burst. Those lawsuits were eventually consolidated into one and Porsche agreed to reimburse 2003-2006 Cayenne owners for those defective pipes. Reluctantly.

Information about the settlement can be found at but – and I hurt to burst your coolant pipe here – the deadline has passed.

Vehicles That Might Have This Problem

Model Generation Years PainRank
Cayenne 2nd Gen 2011–2018 3.01
Macan 1st Gen 2015–2018 0.07

Story Timeline

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What Owners Are Saying

“I smelt something burning for about 20 minutes then as I was driving towards a robot in traffic at about 10 km an hour; I heard a loud explosion. The car adjacent to me on the passenger side told me that something exploded under my car and now there was water gushing out from under the left front passenger side of the car. I smelt burning.”

2013 Cayenne Owner in South Africa

“I was coming out a stop light, and then I noticed fluid spewing out the back of the car. When I got home, coolant light was on; looked inside the reservoir and it was empty. Filled it up; and it just leaked out on to the driveway.”

2006 Cayenne S Owner

“Got the car back yesterday, it was the water pump. I thought it would last longer than 70K. I didnt change the water pump in my Mercedes till 145K (and it was only showing signs of wear, not failure) One shop quoted $1K, had it towed to another and got it done for $540.”

2002 Boxster Owner

OK, Now What?

Maybe you've experienced this problem. Maybe you're concerned you will soon. Whatever the reason, you can help make sure it gets the attention it deserves.

  1. File Your Complaint is a free site dedicated to uncovering problem trends and informing owners about potential issues with their cars. Major class action law firms use this data when researching cases.

    Add a Complaint

  2. Notify CAS

    The Center for Auto Safety (CAS) is a pro-consumer organization that researches auto safety issues & often compels the US government to do the right thing through lobbying & lawsuits.

    Notify the CAS

  3. Report a Safety Concern

    The National Highway Traffic Safety Administration (NHTSA) is the US agency with the authority to conduct vehicle defect investigations & force recalls. Their focus is on safety-related issues.

    Report to NHTSA

  4. Contact Porsche

    Porsche Support

    2200 Ferdinand Porsche Drive Herndon VA 20171 USA

    This site is not affiliated with Porsche.