How we fixed our Volkswagen with a low coolant issue

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How we fixed our 2016 VW Passat 1.8 tsi low coolant issue. We were having an issue where we’d have a low coolant light come on every couple of weeks. We brought it in to get checked, no leaks. The only component not tested with the pressure test was the cap, we changed the cap and the problem hasn’t come back.

[ArlandoJenkins-nyrm]

I’m having this issue right now, I’ve been to two shops in the last week and when I googled it they mentioned head gasket issues smh, going to try this now!

[aaron___]

Good idea to check or clean the cap sealing surface

[abovetheridge]

Crazy it was the cap. I'm working on my 2011 VW Jetta now. Coolant reservoir looks good, but I might just replace since it's only $23 for a new one. One hose has some discoloration which I will replace as well, but I have to trace it all the way through the other lines and engine. But parked, the coolant leaks directly below the right front passenger tire, so it's somewhere on that side that is causing the level to drop consistently. Just started happening so I'm trying to assess myself before having VW dealership charge me $600.

[steverichardson]

Hi just had the same problem. Thanks for the Tip.

[mmafinesse]

I'm having coolant shortage, with my treg and I suspected the cap because there's significant patches of vapour around the cap.

I'll get a replacement straight away.

Tnx.

[mitshumarner]

I had numerous refills and top offs with my 2022 Taos. This might explain why. One VW dealer told me that these cars consume coolant normally. That sounded ridiculous!

[Panda]

My old 98 Pontiac almost died from no oil due to the oil leaking out of the oil sensor plug. The replacement costed 7 bucks. Car almost died for something that costed 7 bucks lmao.

[thEstRonGr]

I think the issue can be very different, dependihrg on the symptoms.
Like, does it leak or not.
Does it smoke white for example or not.
Does it overheat.
Etc etc
By these issues they can find the issue.

[Lil-peskyBlinder]

Man look how clean that engine is I hate my job always destroys my cars dirty building sites 😂

[scarsfromdasouth]

Hi i have the following technique did once when changing the coolant of the mk4 2.0 golf; For like 15 minutes, the engine is On and i accelerate hard each 3 seconds with the drain port open emptying the used coolant but at the same time im filling the coolant from upperside ( were we add coolant) with a an average garden (mineral water) hose with normal water flowing, and we check down till all the drained strange color dissapears. After this process, never had a problem using the car on average but i just did it once, you recommend me to do this again?, or should i just limit to change the coolant without this other cleaning method?, thanks in advance!

[ezerffgcvvv]

I have the opposite problem on my twin charged 1.4 TSI Fabia RS, my coolant level is the same since several months, it should have dropped a bit but no !
What should I do ?

[ridu]

Hi ! I just replaced mine on my Skoda about a month ago and it seems like I lost a couple drops . Is it normal?

[Mahiiwayy]

Today my car just blew white from under my hood and there was a big puddle under my car but no overheating or nothing. I checked the reservoir it was empty I put coolant in there but it drained right out underneath the car. Any ideas would be much appreciated!

[ironbloodedmyth]

In my Mk5 R32 I had a coolant leak from the expansion tank so i changed it, but 2 days in and i noticed my coolant disappeared no leaks so im puzzled maybe the cap i didn't change it to a new one with o ring ill try that.

[barrygreen]

Same issue. After short run if 10 miles, "Low Coolant Lever" alert and coolant is found to have gone from full to dangerously low level. Refill, and repeat 10 mile run and same issue returns. Subsequent visible leak inspection shows wetness under coolant bottle and just a few drops on floor beneath area of bottle. Bought a new cap for 10$ but I want to test if original 4 year-old cap is faulty. How to test for faulty cap pressure level? Why? If I cannot prove the original 4yr cap is faulty, there has to be a fault somewhere still lurking ! Vehicle 2018 Arteon 2.0L Petrol.

[Roberto-]

The cap can cause to have a pressure on coolant system when the cap does not work doe to age or broke

[Data]

Thnxs a lot yes sure easy things first;) yes very good man very good yes 1 cap number 2 see leaks on hoses and number 3 lak test, 4water pump, 4 egr cooler if diesel egine.

[leebee]

I just changed my radiator and now my coolant steams out the coolant cap and I could hear it boiling/pressure . What do you think the problem would be with the thermostat or a blown head gasket??. I start the car and within 5 minutes of driving it starts steaming and boiling

[Tracksavvy]

Can you confirm that this fixed the issue? Or are you still having issues with the cars? I have a 2017 GLI and about 2 weeks ago it was just above the minimum line and tonight it threw a check coolant warning at me just as I had got home. I have yet to investigate if there is some other issue, I just got the car from a reputable dealer and figured there likely wasn't anything wrong with it, I'm going to follow up with them after I check under the hood and conduct my own investigation.

[matejpetrovic]

Hello, i have a Golf Variant 1.9 TDI year 2008 and i am having this issue atm when i turn the car or i get the message STOP and check the antifreeze light comes on..there is no smell, no visible leaks no smoke coming from the car...could really the cap be the problem?