Motor Vehicle Maintenance & Repair Asked by Tim Angus on June 9, 2021
I recently replaced the head gasket in my Renault K9K (700) 1.5 DCi, due to a cylinder/cooling system type failure. As such, the cooling system is full of partially burned diesel. Despite having flushed the cooling system every few days for a couple of weeks and having used commercial coolant flushing products a couple of times, the coolant continues to turn black after relatively little use.
Has anybody got any tips or tricks on flushing a stubbornly contaminated cooling system? I’ve read of people having success with using a pre-dissolved low suds washing powder, is that a sensible idea? Do I just need to be more patient?
I had a blown head gasket in my Mercedes and I went to AutoZone and bought a bottle of k-seal you don't have to flush radiator just change oil it's been months now and not one problem with it overheating since also you don't have to run the heater when applied just pour it in and crank car for about 30 min to hour let it idle and it should fix it
Answered by Tory Stone on June 9, 2021
You'll want to drain the coolant out, of course. Then fill the cooling system with straight water and add dish soap, or better, an industrial degreaser like Purple Power. Run it for about 30 minutes, drain it out, and do another identical flush (water and whatever chemical you used the first time around). After that you'll want to do a third flush, but with straight water (no chemicals). If you are really that worried you can do another water flush. Once the water flushes are done, you can put fresh coolant in, and many guys will recommend vacuum-filling your cooling system to get any air pockets out.
Hope this helps.
Answered by El Ectric on June 9, 2021
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