|Rover 800 820 825 827 Expansion Tank.|
Car: 1999 Rover 800 825 V6 Coupe
Colour: Zircon Silver
When it comes to engines, the coolant (this is often referred to as coolant or antifreeze, because it does both) you use is just as important as the oil. Many people will leave items like this until the service, or until something goes wrong! Neither the oil or coolant levels should be left to chance, otherwise you may be causing irreversible and costly damage.
Oil and coolant levels should both be checked on a regular basis. Many people will just add water to the coolant level, but this just dilutes the concentration of antifreeze/coolant in the system. It is important to maintain the mixture correctly. Not only does the antifreeze & coolant fluid prevent the engine from freezing or overheating, but it also contains rust inhibitors which help maintain the entire engine/radiator/pipes within the coolant system. It also helps to prevent any blockages that may lead to future engine problems.
Most vehicles will simply need a 50/50 mix of water combined with the antifreeze. You should purchase the correct type of antifreeze for your vehicle, and most car shops will have charts or knowledgable staff to help you with this. If unsure consult your owners manual. You can use tap water in the coolant mix, but it is always better to use de-ionised water. Again this can normally be purchased alongside the coolant section in your local car shop.
Changing the coolant in this vehicle from green to pink recently has resulted in the coolant turning a bit of a funny colour. We are not sure if this was just some of the old green coolant in the mix, or if some muck had been disturbed within the cooling system.
So we decided that we would change it again, seeing as though we were changing the other fluids for the car too (engine oil and automatic gearbox oil).
This time though we would flush the system too, just to be sure.
To empty the old coolant out we required access to the bottom hose that attaches to the car radiator. To get to this hose we first had to undo the skid panel underneath the front of the car.
(The red bucket and container were being used to catch the auto gearbox oil because we were changing all the cars fluids.)
The skid plate has now been removed.
Undoing this pipe was easy, as the clip simply needed squeezing, before moving it further up the pipe, then pulling the pipe off the radiator.
When you pull the pipe off, several litres of water/coolant mix will come gushing out, this can be difficult to catch it all in a bucket, as it is not all that controllable! Removing the cap on the Reservoir bottle should help the flow. The reservoir bottle only emptied part way and so I blew into it (yuk!) many times until the flow from the radiator pipe became just drips (making me a bit light headed in the process).
Don't forget to put the pipe back before you refill the system.
Rather than just refill the system, this time we decided to use some cooling system flush, just to make sure we had no muck in the system.
Add the cooling system flush first.
Then we topped up with water. Tap water was used for this, as it was all going to be drained off again soon after.
We ran the car engine for 15 minutes on fast idle to allow the flush to work.
(At the same time we had added petrol engine flush to the engine oil as well.)
Then the water was drained off, we then kept filling the system with tap water from the hose, allowing it to drain off constantly, until we were happy the water coming out was clear. The bottom pipe to the radiator was then refitted.
We purchased some Comma Xtream G30 Antifreeze & Coolant and a tub of de-ionised water. We then added this a jug full at a time to the reservoir bottle.
Adding another jug of de-ionised water to the mix.
Adding another jug of coolant to the mix. Keeping the ratio of coolant to water at 1:1.
Once it was filled the engine was started and the level in the reservoir dropped back down. This was then topped up with more jugs of water and coolant. The car then took a few moments before the thermostat opened and as this happened air came through the overflow pipe, resulting in the level of coolant decreasing again and so a final litre of mix was added.
In all the coolant system took 7 litres of liquid to fill, this is the correct amount for the Rover 825 and so this would indicate we filled the system okay and without creating any airlocks. The cap was then refitted.