Car: 2010 1.8 ES 5 door, Silver
Join Date: 2nd August 2016
Thanked 8 Times in 8 Posts
I did a partial flush on my 1.8 whilst changing the gearbox oil the other week, only via the radiator drain plug (not the block so can't comment on that).
- Waited until the engine was cold.
- Detached the entire undertray (not just the engine oil drain hatch).
- Unscrew the radiator drain plug, catch the dropped coolant somehow (I just used a bucket).
- Once finished draining, screw the drain plug back in and fill with distilled water.
- I then ran the engine for a couple of minutes to circulate things a bit, switched it off before it was showing any signs of serious temperature.
- Went and had a cup of tea, then took the dog for a walk to let the engine cool again.
- Drain again. Once empty, re attached drain plug and fill again but this time with Honda type 2 coolant until coming out of the radiator cap.
- Run the engine with the rad cap off until up to temp, this should get rid of most of the air pockets. it gurgled about three times in my experience doing this. Reattach the radiator top cap.
- Took the car for a run, watching the temperature gauge like a hawk. All solid, no issues (your mileage may vary, make sure to stop if anything looks amiss).
- I topped up the expansion tank too as that level dropped a bit after two runs. Its now rock solid though and hasn't moved for about three weeks.
That's how I did mine, I was planning to do several flushes / the block as well but what came out was so clean and debris free that I didn't bother.
I used a whole carton of type 2 coolant BTW so if you're attempting a block drain as well I'd have a spare on standby just in case (I'm not sure of the capacities).
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