Hi,

 

We need some help bleeding the coolant system on a 1.2 tsi. We recently replaced some parts to the front of the car after a minor bump. Unfortunately the bump was enough to crack the end cap on the main rad and the aux also had a leak. 

 

So we have now installed new rads and went about filling the cooling system. Keeping the cap off and keeping the tank topped up as it pulls the fluid into the system which has worked on less complex cooling systems for me in the past. However I believe these engines have an electric pump for both cooling systems that may require a specific vdcs bleeding routing to help fluid cirulating?

 

There doesn't seem to be a great deal of fluid making its way out of the engine and into the main rad. The t-stat was operating fine previously. 

 

I dont have a vacuum system or the equipment to run the electric pump cycle but can this be done without? Any tips?

 

Thanks 

David

 

 

I'm going to order a vacuum kit. 

I had similar problem on my sons MK1. Think air lock was at heater matrix as no heat. I kept squeezing top rad hoze until fluid in tank dropped. Topped up and repeated. Took a while to get air out. Not sure if it will work on MK3

Alasdair

I've not changed the fluid in one of the EA211 16V 1.2TSI engines yet, I have done successfully on my other car using a draper coolant vacuum refill kit and a stupidly small compressor - and that worked okay, so I'm prepared for replacing the coolant in wife's 2015 Polo 1.2TSI "soonish".

 

Annoyingly on my other car, which has an electric pump for the supercharger heat exchanger, there is no option in VCDS to demand that pump to run - as in a "service routine" although there might be in the "demanded functions" though I didn't look for it. That car does have a bleed point on the heater circuit and a couple of bleed points on the supercharger heat exchangers.

 

I suspect that you can run the electric pump on the cars that have this 1.2TSI engine.

 

Edit:- since I bought that Draper kit, many cheaper kits have started to become available via China, so they should work just as well at least for a DIYer.

Edited 2 March, 20251 yr by rum4mo

19 minutes ago, rum4mo said:

I've not changed the fluid in one of the EA211 16V 1.2TSI engines yet, I have done successfully on my other car using a draper coolant vacuum refill kit and a stupidly small compressor - and that worked okay, so I'm prepared for replacing the coolant in wife's 2015 Polo 1.2TSI "soonish".

 

Annoyingly on my other car, which has an electric pump for the supercharger heat exchanger, there is no option in VCDS to demand that pump to run - as in a "service routine" although there might be in the "demanded functions" though I didn't look for it. That car does have a bleed point on the heater circuit and a couple of bleed points on the supercharger heat exchangers.

 

I suspect that you can run the electric pump on the cars that have this 1.2TSI engine.

 

Edit:- since I bought that Draper kit, many cheaper kits have started to become available via China, so they should work just as well at least for a DIYer.

I'm going to buy the 28pcs as I have three cars of my own which use different adapters. 

 

Thanks for your replies 👍

A pressure fill is what is best practice and if you're getting a kit then you'll be sorted.  2017 would silly German/VW spec G13 coolant for patrial refills but many place will give you the later G12evo which really is a flush out job but they will mix.

 

You can change  the coolant without a pressure filler but you might need a bit of nerve and patience if you are the cautious type.

 

Good luck.

 

. 

All sorted. 👍 Bought some proper hose clip pliers too fed up trying to make do with standard pliers. 😂

I bought a pistol-grip remote clip pliers and still struggled to get on to a couple of clips because of where the ends were on the hoses, PITA, and yet another "special" tool required to do a simple job, worm type Jubilee clips are fine as long as you don't overtighten them on all the fantastic-plastic bits.