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Failed Thermostat Housing/Coolant Loss Info Gathering

Boltsfan17

New member
Location
Tampa, FL
Checked my coolant level after a week of driving and noticed a loss close to midway between full and minimum. To top it off, today I noticed a small pinkish puddle in my garage.

I know for sure there’s a leak. I guess the next question is from where. I’ve heard about the faulty water pumps. Regardless, I’m due for service in 700 miles and thankfully this is part of the powertrain warranty as I’ve just eclipsed the 39k mark.
 

jimlloyd40

Autocross Newbie
Location
Phoenix
Ride
2018 SE DSG
Checked my coolant level after a week of driving and noticed a loss close to midway between full and minimum. To top it off, today I noticed a small pinkish puddle in my garage.

I know for sure there’s a leak. I guess the next question is from where. I’ve heard about the faulty water pumps. Regardless, I’m due for service in 700 miles and thankfully this is part of the powertrain warranty as I’ve just eclipsed the 39k mark.
Almost surely the thermostat housing.
 

Judas

New member
Location
Tempe az
not on reddit

2015 vw gti s dsg non pp
bought new

replaced waterpump around 25k under warranty
replaced thermostat and housing at 59k (just before warranty ran out, wouldve cost me 1100)
also had to replace top timing belt cover at the same time as thermostat for 450 not under warranty
when replacing the thermostat and housting they found 3 leaks i think as well

long story short

bought this car brand new

every single day i can smell a faint bit of coolant after driving it
and coolant was always getting lower and lower
had two dealers check multiple time kept saying they couldnt find anything
until my car shit on me with a dashboard full of error codes, turned out to be waterpump
after the waterpump it kept smelling like hot coolant
both dealers said it was normal for vw to smell that way
iv drivien cars a long time and never had any smell of coolant unless it was leaking
i had them check probly 5 times over four years and could never find a leak apparently
after replacing thermostat housing i hoped thatd fix me smelling it, but no its still there
of course dealer cant smell it,

has me very worried especially having to fix an oil leak from the top cover of the timing chain,
cars too young to have leaks,
 

theDoktor

Ready to race!
Location
Buffalo, NY area
Looks like I get to join this party. No sign of any coolant leakage in early Sept. when I had an oil change & 30K service at the dealer. Shortly after that service I noticed that the perpetually wet spot in my driveway where the nose of the car sits when parked had a reddish tint to it. Then a week or so ago I noticed a puff of steam from under the hood about 15-20 seconds after I shut the car off. This has happened several times since the first observation. Looked under the hood- no obvious signs of a coolant leak except for an overflow tank with coolant at the Min mark when hot. I now have an appointment at the dealership for next week to look at, & hopefully fix this problem.
Thank you all for all the helpful information on this issue. If suspicions are confirmed, I plan on filing an NHSTA complaint. Hopefully enough of these complaints to NHSTA will turn our complaints into a recall.
 

jimlloyd40

Autocross Newbie
Location
Phoenix
Ride
2018 SE DSG
Looks like I get to join this party. No sign of any coolant leakage in early Sept. when I had an oil change & 30K service at the dealer. Shortly after that service I noticed that the perpetually wet spot in my driveway where the nose of the car sits when parked had a reddish tint to it. Then a week or so ago I noticed a puff of steam from under the hood about 15-20 seconds after I shut the car off. This has happened several times since the first observation. Looked under the hood- no obvious signs of a coolant leak except for an overflow tank with coolant at the Min mark when hot. I now have an appointment at the dealership for next week to look at, & hopefully fix this problem.
Thank you all for all the helpful information on this issue. If suspicions are confirmed, I plan on filing an NHSTA complaint. Hopefully enough of these complaints to NHSTA will turn our complaints into a recall.
That could be the biggest recall in history. 😂
 

jimlloyd40

Autocross Newbie
Location
Phoenix
Ride
2018 SE DSG
As long as VW has to pay less for the warranty $ than re-engineering the water pump thermostat housing
it will be warranty repair. That is the way I see it.
That obviously is the way VW sees it also which is really stupid on VW's part. Warranty repairs have cost them far more than finding a permanent fix. Maybe VW should ask another car manufacturer how it can be done. Nobody else has this problem. 😂
 

1fastmk7

New member
Location
Florida
Ride
2017 GTI SE
2017 GTI SE, have started to lose coolant on a regular basis. Slight coolant smell sometimes. Reservoir going from max to min every 5-6k or so.
 

theDoktor

Ready to race!
Location
Buffalo, NY area
Just got my 40K mile, 2017 Sport back from the dealer to check for a leak. Naturally the system held pressure- I was told by the Service Writer that the coolant "just evaporated" from the system. And can anyone explain to me just how evaporation occurs in a sealed, pressurized cooling system? Who wants to be the first to volunteer to use just their hands to remove the overflow tank cap for me the next time the car gets warmed-up? Those warning stickers on the cap are just B.S., right?
So the dealership "topped off" (in writing, too!) the overflow bottle by overfilling it to the seam, not the Max line. It took less than 10k miles for the level to drop below the Min line prior to the coolant loss to start happening. I wonder how long it will take this time? At least I now have dated photos to document the various coolant levels. Looks like I need to get it up on a lift, take the splash pan off & take some photos from below as recommended by a previous poster. (Thanks for the heads-up!)
 

Johaan

Passed Driver's Ed
Location
Atlanta
2018 GTI S, 18k miles, dealer replaced my oil cooler a few weeks ago. I was leaking oil and smelling coolant.

Wager I have to go back, I'm still smelling coolant, but its less than before. Levels are holding pretty steady as far as I can tell. 150 miles should have been long enough to burn off any residuals.
 

ReadTheBook

Drag Race Newbie
Location
Bay Area Smoke Hell
Ride
2017 GTI Sport DSG
2018 GTI S, 18k miles, dealer replaced my oil cooler a few weeks ago. I was leaking oil and smelling coolant.

Wager I have to go back, I'm still smelling coolant, but its less than before. Levels are holding pretty steady as far as I can tell. 150 miles should have been long enough to burn off any residuals.
Leaking from oil cooler down onto the thermostat housing/seal is the second failure mode I personally experienced with my thermostat housing...
 

2016manualgolf

New member
Location
Toronto
just got my oil changed today, 134,000km/83,000miles, the car is 3 years and 9 months old.

the thermostat housing assembly is leaking, my garage called the local VW dealer, they recommend changing the seals, hoses, and water pump. Over $1,000cdn in parts and approximately that again in labour. the dealer said this part has been changed 3 times since the mark7's came out, and that they have done 5 golfs already this month with the same problem.
ummmm this is a pretty major $$ repair, like 25% of the value of this car.
the dealer says its only covered till 100,000km
called VW Canada, they want me to take it to the dealer, then the dealer and VW Canada will have a conversation about it and decide how much, if any, they will cover.

this is my second new golf (1st 2012), and I've noticed a big change in VW that since the diesel scandal, not the sweet 'we love our customers' company, now its all very adversarial. so disappointing: the car (multiple warranty repairs), the dealer, and VW.
thanks for letting me vent, cheers

p.s. oh anyone had their rear callipers fail yet? they will, and VW doesn't have replacements in stock... had to rent a car for three days to have mine rebuild.
should have bought a dull but reliable Toyota
 

RichardCranium

Ready to race!
Location
Arizona
That obviously is the way VW sees it also which is really stupid on VW's part. Warranty repairs have cost them far more than finding a permanent fix. Maybe VW should ask another car manufacturer how it can be done. Nobody else has this problem. 😂
Lol, yes, they do. Google the Ford Powershift transmission debacle. Instead of redesigning the transmission, they chose to continue on with the problematic design, and it's cost them billions in warranty repairs. They knew even before the transmission made it into production that it was a piece of trash and they ignored it.

 
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