MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Beanmk5 on March 16, 2023, 06:41:34 pm

Title: Coolant stop once a week can't find leak
Post by: Beanmk5 on March 16, 2023, 06:41:34 pm
Been getting a STOP coolant warming once a week and just been filling with water, obv with weather changing I want to get some antifreeze in but wanted to find leak and fix it
Ordered some of this stuff, u put it in coolant tank and run car then shine uv torch and it glows like a glow stick but can't see no drips or any sign of a leak
So now I'm baffled

Only thing I have noticed when it says stop coolant low is the screw on cap isn't tight any more so bought new cap and still have same issue
(https://i.postimg.cc/15SfCtH7/FB-IMG-1678992044755.jpg) (https://postimg.cc/RqPSqv2w)
Title: Re: Coolant stop once a week can't find leak
Post by: GVK on March 16, 2023, 07:53:53 pm
Some garages will have a coolant system pressure tester, to pressurise the system to show up leaks
Title: Re: Coolant stop once a week can't find leak
Post by: bobby_fodge on March 17, 2023, 11:24:06 am
Quote from: GVK on March 16, 2023, 07:53:53 pm
Some garages will have a coolant system pressure tester, to pressurise the system to show up leaks

This test found a tiny crack in a coolant flange that was the cause if my mk4 losing coolant. The test only took them 20 mins.
Title: Re: Coolant stop once a week can't find leak
Post by: breeze on March 17, 2023, 02:00:36 pm
Depending on how affordable your garage is, it may be worth buying a pressure testing kit on Amazon. They are not expensive, just a pump with a pressure gauge and a couple of adapters.