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Old 10-11-12, 03:44 PM   #1
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Default How to: Change coolant on a 306 DW8 Engine

This guide is for the DW8 / DW8B engined Peugeot 306 diesel, from around 1999.

You will need:

Coolant
Water pump pliers
2L pop bottle
Black Tape (electrical or duct)
Water (watering can or hosepipe)

1) FAMILIARISATION

This is the engine. I've marked on the important bits we'll be working on.



ORANGE: Expansion Tank.

GREEN: Where we'll drain the coolant.

RED: Bleed points
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Old 10-11-12, 03:47 PM   #2
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2) DRAINING

The bottom hoses are very difficult to reach, but if you trace the smaller of the two pipes, it goes into the engine block right by the oil filter and behind the expansion tank:



Warm up the engine so the coolant gets warm and softens the pipes a little. Forcing cold pipes could cause damage.

When the engine is warm, use your water pump pliers to squeeze in the clip on the RIGHT hand pipe and draw it towards you.

The pipe should now come off. Remove it from the clip and drop it down to the bottom of the car.

Unscrew the expansion tank cap and let it drain.
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Old 10-11-12, 03:49 PM   #3
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3) FLUSHING

Give the system a good flushing with clean cold water.

When done, reconnect the pipe and put the pipe securing clip back.
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Old 10-11-12, 03:56 PM   #4
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4) REFILLING

To make refilling easier, fashion a funnel with a 2L pop bottle. Cut the base off and wash thoroughly.

Remove the plastic ring that sits on the neck after you've broken open the lid.

Wrap a few loops of tape around the neck to ensure a good watertight seal between the bottle top and the expansion tank.

There is a small overflow point on the expansion tank, you'll have to keep this blocked with your thumb or a bit of tape, otherwise the coolant will all leak out.



Put in about 3 litres of coolant. Capacities vary, but the coolant system is approximately 6 litres, so we'll do a 50% mix.

Then add water until the bottle is almost full.
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Last edited by Gibbo; 10-11-12 at 04:03 PM.
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Old 10-11-12, 03:59 PM   #5
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5) BLEEDING (1)

Start the engine and let the water get up to temperature.

As the coolant flows around the engine block the water in the bottle will go down, keep it topped up.

After a few minutes bleed the pipes.

The first bleed point is just by the fuel filter, to the left of the battery:



Carefully unscrew the cap, taking care not to lose it!

After a short time coolant will start to spit out and you'll see bubbles appearing in our bottle, keep it topped up!

When coolant flows constantly, replace the cap.
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Old 10-11-12, 04:02 PM   #6
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5) BLEEDING (2)

The second bleed point is at the back of the engine, just by the brake servo and brake fluid reservoir:



Again, remove the screw and let the air out.

Don't forget to keep topping up the bottle.

When coolant runs constantly, re-attach the cap.

Give it a couple of seconds then try the first bleed point again. You shouldn't need to remove the cap completely, just unscrew until coolant seeps out.

Tighten it back up and then repeat with the second bleed point.

Remove whatever you used to block the overflow and let the water drain. It should just be fresh water so it doesn't matter so much if it goes everywhere.

Re-attach the expansion tank cap, give your heaters a try and look out for the fan coming on. You may have to wait some time!

Let the system settle then re-check for air after you've taken the car for a run and it's got upto normal operating temperature.
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Last edited by Gibbo; 10-11-12 at 04:05 PM.
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