The Anti-Freeze in my car which is now 6.5 years old wasnt changed since it last went to service at a Skoda workshop (or atleast that's what the receipt said) 3 years ago. I don't know what made me oversee this when I serviced my car (another DIY); the regular oil, oil filter, fuel filter, air filter (clean - A K&N cone), cabin filter and the sorts in April this year, luckily I was on one of my pop-up missions and noticed the weird brownish pink color in the expansion (coolant) reservoir when I was like: damn I've missed this one for long!
So this thread is purely for flushing and changing my coolant!
The research began as I wasn't too sure on how this was going to be done and whether I needed pro help, but what I found is what made this another great And satisfying DIY project.
The Skoda workshop manual for a 1.9 TDI engine showed what was needed to be done:
http://workshop-manuals.com/skoda/fa..._ii_roomster)/
The Coolant Drain Valve -
The Bottom Coolant Hose -
The tools/parts needed were simple:
1. Torx set (1/2 inch and 1/4 inch)
2. Plumbers Pliers
3. Bucket
4. Lots of water
5. Drinking water
6. Coolant Flush (i used Abro)
7. New Coolant
The process to be followed (as per manual)
1. Remove the underbody protection plate (if any - this was part of the rough road package on diesel Fabias Mk2)
2. Open the coolant drain valve and allow to drain
3. Remove the coolant hose and allow to drain
4. Fill new coolant
The actual process was somewhat different if you want better results.
Note: always ensure your car engine is cool; engine coolant can be very very hot!
1. Drain the coolant from the hose and the valve
2. Use a coolant flush with a mix of water filled in after draining the original coolant.
This can also be added to the old coolant.
3. Run the car in idle up to when the engine is at optimum temperature (regular)
4. Switch on the heater and set to maximum
5. Let the car run for another 20-30 minutes
6. Drain out the coolant and coolant flush
7. Repeat the process from steps 2-6 with water until the drained water is clear (usually about 2-3 times)
Note:
1. Always ensure you give about 15-20 minutes for the engine to cool after running before draining (coolant is hot)
2. Some coolant flushes ask you to run the car for 100kms before draining
3. One can also run flowing water from a garden hose in the coolant reservoir with the engine running and drain valve open (with heater too) - this too is very efficient in cleaning out old coolant
Now I followed the above steps to drain the coolant:
The car first on Jack Stands -
The engine protection plate off (to get this off you'll need to put your car up on jack stands, get under and remove the bolts - 1/2 inch ratchet set will do)
The engine protector plate -
Now off -
Now once the plate is off one can get under the car to see the position of the drain valves and coolant hose; problem is I couldn't find the drain valve as shown in the pic from skoda, it just aint there!
So with much deliberation and confusion I decided to continue.
Under the radiator were 2 hoses one bigger in diameter at the bottom and another just above it. The one right at the bottom was for the intercooler I removed that hose as to get access to the clamp on the bottom coolant hose.
This one is the hose from the inter cooler -
Here's a pic of the coolant being drained from the bottom coolant hose (without the drain valve)
From here it was simple, the second the coolant hose was off - out came the coolant in this color:
I knew it needed a lot of flushes before it was completely clear again!
I didn't have a garden hose or tap close by so I had to improvise a little with 2.5 litre bottles of water back to back.
First up was the coolant drain/flush liquid from Abro; I added this into the coolant tank with water and ran the engine for 30 minutes; with the heater (at max) on for 15 minutes.
I followed the Top-up, Run the Engine, Heater on, Switch off after 20 minutes, Let it cool down and Drain; Method 3 times.
Since I didnt have running water (you can skip this if you want) I ran the engine with the coolant hose off, feeding the expansion tank with water through 2.5 litre bottles (one after the other) I used about 5 such bottles.
Then finally another top-up and then drain which resulted in the following flush:
Now was the time to fill the reservoir with coolant; I mixed coolant in a 40/60 ratio with drinking water and filled it up to the max line.
Now the only thing is that in the manual it is mentioned that it would need 6.6 litres of coolant (mixed) but it drained only about 3 and the same with the fill and evertime it completely emptied the reservoir from both the radiator and the coolant hose.
Now the final process involved running the car a little and letting it cool off before the level of coolant stabilised; now I just topped it up with drinking water about 300ml and it's been good!
Loved every bit of this DIY, but confused about why the amount of coolant required was so little (atleast from what is mentioned in the manual). Overall I don't think I've missed anything here, as I had opened the hoses in the intercooler as well and it didn't drain any Coolant!
The coolant now is also running clean in the reservoir (the light pink color) as it is supposed to be; guess I'm overthinking this! This has been an awesome DIY!
Cheers!