TomB Posted May 12, 2020 Share Posted May 12, 2020 Ahead of changing from pink OAT to blue EG coolant for my new Radtec, I’m trying to clean out the coolant system. I think I’ve probably neglected to flush and clean out with each coolant change as it’s filthy and taking some doing. Despite doing three fill up, run to temperature and drain down with tap water, it’s still coming out mucky and pink.Do the radiator flush additives on the high street do anything, should I run one through the system? Any issues with using it on a new radiator? Something like this https://www.halfords.com/tools/garage-equipment/tyre-inflators-and-pressure-gauges/holts-speedflush-250ml-741462.html Link to comment Share on other sites More sharing options...
Wrightpayne Posted May 12, 2020 Share Posted May 12, 2020 Watching with interest :-)Similar journey imminent Link to comment Share on other sites More sharing options...
TomB Posted May 12, 2020 Author Share Posted May 12, 2020 Suggested that removal of the thermostat might be needed? That’s a nuisance if that’s the case! Link to comment Share on other sites More sharing options...
7 wonders of the world Posted May 12, 2020 Share Posted May 12, 2020 reverse flush the block and rad with the hose on full bore, you might need to pop the stat housing out, don't forget the heater if you run one as if it turned off there will be residual in there too. Link to comment Share on other sites More sharing options...
TomB Posted May 12, 2020 Author Share Posted May 12, 2020 Thanks to advice from Dave Gemzoe, I have just returned from the garage with a much cleaner looking coolant flush. I took the bypass hose, attached the hose pipe to it with a jubilee clip and ran the hose through it. The flow was turned up reasonably high looking at the flow out of the radiator, it has done the job. I think this has flushed the engine behind the stat, up through the block and out of the top hose/ rear of the block. I have filled with water again, and plan to run up to temperature tomorrow and repeat which should do it. Link to comment Share on other sites More sharing options...
elie boone Posted May 13, 2020 Share Posted May 13, 2020 Holts speedflush say's that after using this you need to refill with coolant and radweld, maybe this is just a disclaimer ? that is why i never used it. Link to comment Share on other sites More sharing options...
TomB Posted May 13, 2020 Author Share Posted May 13, 2020 Having had some apparent success with the hose flush, I don’t think I’ll need the Holts radiator flush now, it coming out clean enough. Link to comment Share on other sites More sharing options...
Guy Lowe Posted May 13, 2020 Share Posted May 13, 2020 I have just changed over from pink to BLUCOL, didn't bother with a flushing agent just filled with fresh water and used an airline to blow it all out. Did this about 5 time until the water came out clear. Link to comment Share on other sites More sharing options...
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