how to replace coolant? - Page 2 - Renault Forums :: Independent Renault forum

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post #6 of 17 (permalink) Old 8th January 2017 Thread Starter
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Re: how to replace coolant?

So :

1. When engine is cold remove bottom hose and filler cap

2. Flushing (not needed on newer car) what do you mean from bottom to top??

3. I have one bleed screw i think

4. Fill with new coolant (heaters set to max temperature is not needed because in radiator is temperature regulated by flaps on airflow)
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Re: how to replace coolant?

There ya go

Flushing.

Water normally flows in one direction around engine and to radiator.
Hot water into top of radiator from engine
Cold water from bottom of radiator to engine.

So to flush radiator, where gunk is most likely, hose into bottom of rad and flush so jammed gunk is pushed out, not further in.
But messy unless you can get a good seal on bottom pipe connection or remove radiator.
Engine flush easier as you can stuff a hose pipe into top hose and back flush it that way.

With a newish engine and no worries that coolant has broken down (looks sludgy), I simply refill with water, run it a little to circulate, then drain down again.
If more concerned, I've taken to following advice on here and popping a dishwasher tablet (without powerball) into the system and let it work for a day before draining and flushing.

Heater setting.... good practice as not all cars work on flaps.
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post #8 of 17 (permalink) Old 8th January 2017 Thread Starter
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Re: how to replace coolant?

Jack car using jack stand or another type or not jacking car?
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Re: how to replace coolant?

Quote:
Originally Posted by nexon View Post
Jack car using jack stand or another type or not jacking car?
You need access to bottom hose so probably means jacking up.
And never get under a car with only a jack supporting it so yes, an axle stand.

You will need to lower again once hose is off to level the engine and avoid coolant getting trapped.
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post #10 of 17 (permalink) Old 8th January 2017 Thread Starter
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Re: how to replace coolant?

The problem is that i dont have axle stand... can use only jack which is in car... or something like this
but when i drain fluid (must go down from these) and after is problem with bottom hose when car is down and no coolant (can not start again and go up on ramp).
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coolant , d4f , flush , liquid , replace

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