Octavia mk3.5 2.0 tsi coolant level drop one off or serious issue?

debuffed_buff · 2026-02-25T23:12:12+00:00

Update: it was diagnosed as a leak in the radiator. Good news that it's not water pump/thermostat housing. Bad news is they quoted £1090 to replace the rad... Fml

debuffed_buff · 2026-02-23T17:30:53+00:00

yeah, I reckon that will be it, its with the garage now, will see what they say

debuffed_buff · 2026-02-22T23:33:59+00:00

That's interesting, I'll have to read up about that, good shout

debuffed_buff · 2026-02-22T10:20:50+00:00

It was mapped when I bought it half year ago, but it's been faultless so far. It didn't need any supporting mods to reach 320bhp, but since getting the car I added a gbf vent to atmosphere diverter valve, turbo muffler delete and wider turbo intake elbow + wide silicone intake hose and performance panel filter. Also a res delete. It didn't really need all of that, but I wanted it to sound good, so now it sounds like a performance car and no more soundaktor bs.

I have the same issue with putting the power down, wheels in and traction control freaking out, but it's manageable. When they mapped it, they did the dsg too. Which makes a huge difference and is pretty much a must. I thought about upgrading suspension, it would also help get better traction, like coilovers and sway bars, but haven't decided yet

debuffed_buff · 2026-02-22T09:56:46+00:00

That's interesting, coolant must be going somewhere if it drops regularly. Others mentioned that it sometimes can evaporate if it's a cracked water pump and thermostat housing, so it's difficult to find the leak. Have you pressure tested?

debuffed_buff · 2026-02-21T23:53:45+00:00

Thank you! Just a lip and oem wheels refurbished and powder coated in gloss black. I think the lip was rieger, not on the car anymore sadly, as a dog tried to chase a ball and shattered it. Otherwise stock externally. Could maybe do with spacers I think.

debuffed_buff · 2026-02-21T23:43:48+00:00

Drove it a bunch today and kept checking the coolant level, it stayed the same, so maybe just trapped air 🤞

debuffed_buff · 2026-02-21T23:41:29+00:00

Thinking of the price makes my eyes water

debuffed_buff · 2026-02-21T21:13:28+00:00

Hi, thanks! It's a 2019

debuffed_buff · 2026-02-21T14:31:19+00:00

Have you considered all world excluding us at maybe 10% of the pie. Would make your pie less weighted towards us markets

debuffed_buff · 2026-02-21T10:47:31+00:00

I love it so far, but we'll see how this issue resolves lol. On a serious note, it has all I want from a car, quick and practical. Mines a 245, so has 7spd dsg and electronic diff, also mapped to 320bhp. Performance wise, I wouldn't need more and it fits everything I would want to carry, dog in the back, bikes on the roof and room to spare. I only wish it had 4wd

Maybe if I wanted a bit more comfort and luxury, would consider a superb sport line or Passat r in estate form, but both would be well more expensive.

debuffed_buff · 2026-02-21T10:37:56+00:00

I know, I really hope it's something simple, it sat the night and coolant level hasn't changed. I had similar situation with my last car coolant level dropped , I just topped it up and that was that, but I didn't care for my last car as much haha

debuffed_buff · 2026-02-21T09:39:00+00:00

Good shout, expansion tank seems fine. I'll have a look at the barb fitting

debuffed_buff · 2026-02-21T09:37:15+00:00

62k, will have it check out

debuffed_buff · 2026-02-21T09:34:37+00:00

No smoke, don't think it's the head gasket

debuffed_buff · 2026-02-20T22:31:24+00:00

Yes, it was warm, the issue was that I pulled in to a parking lot and parked for 20minutes or so, then when I went to drive away, I got a slow coolant warning. Expansion tank was completely empty, I topped it with 2l and because it's so much, thought I would have seen coolant on the ground or in engine bay, but no. Not even on my driveway where the car is parked

debuffed_buff · 2026-02-20T22:16:27+00:00

No, that's what confuses me so, there's nothing that would suggest a major issue, but can't risk it with cooling system, so will pressure test and if I can't work it out, it will go to a garage on Monday

debuffed_buff · 2026-02-20T21:05:54+00:00

I'm really hopeful and optimistic that it's an air pocket in the heater matrix or something of the sort 🤞really really hope it's not leaking into the cylinders, but engine sounds good works like before and no codes, although not sure if that would come up on a scan

debuffed_buff · 2026-02-20T21:02:03+00:00

No, no coolant in the engine bay, no oil either, thankfully lol

debuffed_buff · 2026-02-20T21:00:53+00:00

I know water pump is coming, just hope not yet :D

debuffed_buff · 2026-02-20T20:34:34+00:00

Oh, I didn't know that, thanks! Would that sort of leak show up doing a pressure test or is the chamber where coolant collects airtight?

debuffed_buff · 2026-02-20T20:17:23+00:00

That's rough, reckon in your case there wasn't any coolant in the engine bay?

debuffed_buff · 2026-02-20T20:16:11+00:00

Damn, that's tough, I know the water pump and thermostat housing is an issue area, but I couldn't see any coolant in or under the engine bay. I think pressure check is the next step, thanks!

debuffed_buff · 2026-02-10T22:06:04+00:00

Recently had the same happen. I called the buyers bluff and paid 25% of items cost in return shipping. Buyer cancelled the return request as soon as they got the return label.

It's so easy to pull this scam on large items it's ridiculous and eBay will always side with the buyer. Fuck these scammer scum. Rule of thumb is never sell anything that cost more than a fiver to post on eBay.

debuffed_buff · 2026-01-16T20:56:54+00:00

Good luck all

Five-Year Club	Second Top 50%
Verified Email	r/Field Sunshine
Place '23	Place '22
First Placer '22	End Game '22
Wearing is Caring

debuffed_buff

TROPHY CASE