Coolant Leaking Problems of Volkswagen GTI

Engine thermostat and pump failure with gradual coolant leak. Coolant required refilling multiple times within 45,000 miles, sometimes coolant getting dangerously low without warning until car is on interstate. Thermostat/pump has also begun overcooling engine, not allowing it to get up to operating temp when on interstate and shutting out usage of cruise control. This is a well known and documented issue with mk7 Gti.

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Thermostat housing seal failure has led to coolant leak. Discovered by technician during unrelated maintenance. Car has 76,000 miles.

Thermostat housing leak causes coolant leak and low coolant warnings. Was operating the vehicle under normal conditions when low coolant warning illuminated.

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The thermostat housing on the engine developed a significant leak, allowing coolant to drip on the roadway and also endangering the car's engine from overheating and possible power loss. This could of course cause a slippery road surface and could also result in the car losing power on the street creating a hazard.

Thermostat housing leaking coolant major amounts of coolant over the course of 5k miles, much more coolant than should be considered normal. Could lead to engine failure and/or stalling while driving.

2 years after purchasing my car brand new the coolant level was low. After calling the dealership they instructed me to top off the reservoir with distilled water. In February of 2019 I had the car in for general service including a coolant flush at a private, licensed, vw mechanic. He discovered my waterpump/thermostat housing was leaking and likely had been for a long time. He replaced the assembly and filled the car with new coolant. In August of 2019 I discovered once again my coolant level was low. Upon inspecting underneath my car I found dried coolant on my oil pan. My mechanic is again telling me the waterpump/thermostat housing is leaking and will need to be replaced. Nothing has been done to the cars cooling system and driving habits have not changed over the lifetime of this car. The mechanic pointed to a poorly designed seal on the thermostat housing where the leak occured. The replacement housing appeared similar in design. This is a widely reported issue, a slow coolant leak, on 2015+ vw golfs, Gtis, and rs and in extreme cases can lead to an overheated and ruined engine. The first incident occurred at roughly 60,000 miles, outside of the factory warranty. The 2nd incident occurred at roughly 88,000 miles.

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Waterpump had to be replaced at 49,000 miles was leaking coolant. This is a widespread issue with the ea888 engine and needs either a recall or warranties extended.

Noticed burning coolant smell coming from the engine compartment after the vehicle reached operating temperature and the car was stopped. Could hear a sizzling noise with the engine off and the hood open. The coolant level was at the minimum line. The dealer diagnosed a leaking thermostat housing. Dealership replaced the part under warranty. The repair was performed at 34,655 miles.

Waterpump/thermostat housing covered in dry coolant, leaking due to warpage of the plastic parts used my Volkswagen. Coolant needs to be topped off every 3 months, vw said they didnt find anything wrong. Problem is getting worse as the parts fail and will lead to catastrophic failure and damage/overheating to the engine.

Coolant pump leaking.

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I noticed that my speedometer was not properly functioning so I went to the vw dealership and they told me that I had a coolant leak and coolant migration. The coolant apparently migrated through the wiring harness to short my instrument cluster. The entire wire harness and part of my instrument cluster is now inoperable due to the migration. I was quoted a $3,800 estimate and my car only has 68,000 miles. I performed online research and several 1999 vw's had the same problem due to a design defect that dripped coolant over the wire harness. There is even a technical service bulletin filed with the NHTSA that instructs vw how to replace to massive problem. I contacted vw and they will not help even thought this is a widely reported problem with 1999-2001 vws and a design defect. Now I need to replace the wire harness, which apparently runs through most of the engine and car components and my instrument cluster- a $3,800 repair. Rather than correct their design defect, vw offered me $1,00 offer a new vw, which is totally unacceptable. Updated 12/12/07.

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