Mk2 GTi 16V coolant leak

Topic: Mk2 GTi 16V coolant leak (Read 837 times) previous topic - next topic

Mk2 GTi 16V coolant leak

August 02, 2023, 02:48:21 PM

Hi all,

Just joined this site as am the proud owner of an oak green 1990 16V GTI.

I have a coolant leak coming from the passenger side of the engine block just below and further forward of the distributor.

Appears to be a faulty flange that needs changing and probably the rubber hose going into it.

Two questions please;

1. Can someone direct me to the correct parts - I've been google'ing but I keep being directed to what I think is the wrong flange.

2. Is this an easy home job or should I go to a mechanic (I'm reasonably proficient but have only really worked on air-cooled VW'a) and don't really know my way around this engine just yet.

Thanks in advance.

Best,

Simon

Re: Mk2 GTi 16V coolant leak

Reply #1 – August 02, 2023, 03:00:52 PM

Hi Simon,

Welcome to the club!

First off, do you have an early or late 16v?
As this will dictate what flange you have.
I believe they're either plastic or metal.

It's not uncommon for these to leak, the flange can warp and the o ring usually goes hard and stops sealing.

Re: Mk2 GTi 16V coolant leak

Reply #2 – August 02, 2023, 03:05:06 PM

Is it like any of these?
https://www.autodoc.co.uk/car-parts/oem/027121145b

Re: Mk2 GTi 16V coolant leak

Reply #3 – August 02, 2023, 03:06:45 PM

Hi Monkey,

Thanks for the reply. It is a 1990 GTi 16V, I'm pretty sure the flange is black plastic. I've put some photos on the facebook page seeking some help.

Thanks.

Re: Mk2 GTi 16V coolant leak

Reply #4 – August 02, 2023, 03:09:06 PM

Yes, does look like one of those (i.e. only one in and out on the flange).

Re: Mk2 GTi 16V coolant leak

Reply #5 – August 02, 2023, 03:23:36 PM

From what I can see from looking in the engine one of these appears to be the one.

https://www.autodoc.co.uk/metalcaucho/8610008
https://www.autodoc.co.uk/original-imperium/10468687
https://www.autodoc.co.uk/nty/15068213

Maybe I should just bite the bullet and take it off alone with the hose I'll change too so I can have a proper look?

Appreciate the info on the website haven't seen this one before

Re: Mk2 GTi 16V coolant leak

Reply #6 – August 02, 2023, 03:55:22 PM

A top tip when shopping at Autodoc is if you use their phone app rather than the website, it's generally cheaper.

And the discount changes daily. So if you're not in a rush, stick the parts you want in your basket and log in each day till you get a good deal. You see 41% off fairly regular, I think I've only seen 45% off once or twice, maybe Christmas and New year.

Dave missed a trick, here's a £10 coupon if you do order:

AC11779033

Re: Mk2 GTi 16V coolant leak

Reply #7 – August 02, 2023, 04:05:38 PM

Thank-you!

Re: Mk2 GTi 16V coolant leak

Reply #8 – August 02, 2023, 04:41:31 PM

Eddy, coupon code is invalid. have you sent the correct one?

Re: Mk2 GTi 16V coolant leak

Reply #9 – August 02, 2023, 04:46:33 PM

Don't forget, you'll also want the O ring to go with it.

As Tim said, use the phone app, it's cheaper, but word of warning, it all comes from Germany, so can take up to two weeks.

Very useful site though, I literally rebuilt my 8v using it.

Re: Mk2 GTi 16V coolant leak

Reply #10 – August 04, 2023, 09:18:17 AM

I don't know, I just copied and pasted so would assume it would work.
This is the full info:

Quote

Great news! You've been given a gift of a £10 coupon.

1. Follow the link https://interstitials.onelink.me/1036709825?pid=Sharing&af_c_id=AC11779033 to install the AUTODOC app

2. Enter your coupon code AC11779033 at checkout

3. Get your £10 discount