MK7 Golf GTI Coolant Leak

**stellio78** · 18-09-2021, 07:37 PM

Hi all,

Coolant level has dropped a few times and I finally had time to investigate. Looks like the coolant is leaking from where the lower radiator hose (Part# 5Q0122051B) attaches to the engine.

Attachment plate looks like it bolts onto the block with 3 torx screws and I'm guessing there is an O-ring between that is leaking.

Or am I incorrect and this is a common leak coming from elsewhere?

Is there a recommended site that I can use to look up to see how this is assembled and what part numbers I will need to order? (illustrated parts catalog)

Hope you guys can help.

Cheers, Stellio

**gregozedobe** · 19-09-2021, 01:13 AM

Most coolant leaks I've read about were coming from the thermostat/water pump housing. Could it be seeping down from there on your car ?

**stellio78** · 19-09-2021, 06:28 AM

Ok, thanks for that info. I’ll have another look

**stellio78** · 19-12-2021, 08:01 PM

Alright. So after some searching I see I'm going to be needing quite a few parts to repair this leak.

Am I just going direct to my local VW dealer for parts or is there a better option people are using?

Will be needing thermostat housing, water pump, water pump union seal and probably a few more parts once I research the job more.

Thanks for any help.

**h100vw** · 20-12-2021, 06:48 AM

Vagparts. You need a water pump there.

**Lucas_R** · 20-12-2021, 08:05 AM

Here is the link to a new water pump and thermostat assembly. If you are going to do the repair yourself then this is what you need + new coolant.

The repair is not an easy one as the waterpump is buried under the inlet manifold.

Audi 8V & Volkswagen MK7 - MQB EA888.3 - Water Pump /Thermostat Bundle
– VAGPARTS Australia

**Sharkie** · 20-12-2021, 08:09 AM

Take your MK7 to a VW dealer and ask for a warranty repair. They do waterpumps and ancillaries as goodwill warranty repairs as it is a VERY common problem. Well documented on the Net and if they push back (which they shouldn't) drop the words ACCC and "it is reasonable to expect that a waterpump will last more than (INSERT the age of your car here) years."

Had our MK7.5 TSI done after the factory warranty (3yrs and the issue was at 3yrs and 3 months) expired under that and my MK7.5 R just had it done after 3 years and 2 months(5 yr warranty though).

the moment a metal pump comes out, I'm fitting that ....

**stellio78** · 20-12-2021, 09:41 AM

Thanks for the info guys.

Regarding getting it repaired under warranty, my car is 6.5 years old and I haven’t been back to the dealer for the last 3 years so is there any chance they will fix it under this poor designed part warranty?

**stellio78** · 20-12-2021, 09:52 AM

Gave them a call, they will inspect and submit a report for a good will repair with VW Australia.

Won’t be till mid January, I’ll let you know how it goes.

Thanks again