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[mathewst]

Was thinking od giving a rad a thorough flush in the next few days.
I have some problems with coolant cause the car seems to be loosing it slightly (but cannot find where HBV seems ok, coolant bottle doesn't have oil inside, and no leak can be seen) but the rad has never probably been flused so I guess it could use some cleaning cause it is bloody hot here now.
Plan is to connect the ordinary garden hose instead of the hose on the upper left side of the rad and open the valve on the lower side and simply run tap water for some time.
Read somewhere that the 2.5td has a block drain plug.
Should I look for this block drain plug or simply unscrew the radiator bleed valve

[Agemo]

It's always a good idea to give it a good flush, and the TD has a drain on the block, (I think it's a Torx if memory serves) as well as the Rad drain. It's a chance to flush the block as well as just the Rad.

[cem_devecioglu]

disconnect from engine and use some lime dissolver.. wait for 20-30 minutes for the chemical to work ..
 
and then you will see many holes
 
seriously , loosing coolant is another problem.. use some dye additives so you can see..

[tgm147]

disconnect from engine and use some lime dissolver.. wait for 20-30 minutes for the chemical to work ..
 
and then you will see many holes
 
seriously , loosing coolant is another problem.. use some dye additives so you can see..

As above. You can make your own dye additive easy enough. You need 4 highlighter pens (the fluorescent looking green ones), a litre of water and a UV light. Crack the pens open and leave them to sit in the water for half an hour. Squeeze out the dye as much as you can then throw them in the bin. Empty the water bottle on the car by removing one of the pipes and tip in the green dye after the bottle has drained and you've replaced the hose. Start the engine and let it pump round and mix with the coolant for a while. After it's had a while to mix check over the engine with a UV light. Any leaks will be nicely apparent.

Once you're done throw a bottle of coolant flush into the tank and do a water change as usual.

[dbug]

disconnect from engine and use some lime dissolver.. wait for 20-30 minutes for the chemical to work ..
 
and then you will see many holes
 
seriously , loosing coolant is another problem.. use some dye additives so you can see..

As above. You can make your own dye additive easy enough. You need 4 highlighter pens (the fluorescent looking green ones), a litre of water and a UV light. Crack the pens open and leave them to sit in the water for half an hour. Squeeze out the dye as much as you can then throw them in the bin. Empty the water bottle on the car by removing one of the pipes and tip in the green dye after the bottle has drained and you've replaced the hose. Start the engine and let it pump round and mix with the coolant for a while. After it's had a while to mix check over the engine with a UV light. Any leaks will be nicely apparent.

Once you're done throw a bottle of coolant flush into the tank and do a water change as usual.

Easier to use a food dye