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Bleeding Coolant

craig132

By craig132,
in General Maintenance

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Craig SLO33 Enthusiast

Craig SLO33

Posted
Posted (edited)
hey hey, does anybody know how to flush coolant from a rb25 engine block? the radiators removed and i have all the AC removed so i cant turn the heater on, and not sure on other ways to do it, cheers

you just need 2 block off the bottom hose, fill up the motor with water thru the top hose ,unblock the bottom hose to drain it again,. do that a few times should acheive what you want to do you might want 2 take out the thermostat first..

Edited by Craig SLO33
08yannch Rising Star

08yannch

Posted
Posted

i just did this 2 days ago lol

what i did was first undo top radiator hose then the bottom one i then flushed with water and then (first time trying this) ran compressed air through the system to flush out every last bit this cleaned out almost all of the old coolant as i know i used 8L of fresh coolant and the rb25 takes about that much.

alternatively there is a bolt on the drivers side of the engine that u can un do to drain every thing and then u could flush with water *note u need three bond 1386B to seal the bolt

and also when toping up with water only use distilled or (better) because tap water is what causes corrosion. i used 10L distilled water and 1L of coolant concentrate. also distilled water will extend the life of ur coolant so u dont need to change it as often

¿? why do we need a thermostat especially in sumer ? was thinking of taking mine out

mad082 Grand Master

mad082

Posted
Posted

the thermostat is needed at all times to make the car run properly. running without it can actually cause overheating issues, as weird as it sounds, if you are driving it hard. it will also cause you to use much more fuel not having it in as it will take you car much longer to heat up and on the highway the temp can drop back down to where the car is on cold temp enrichment. to explain that a bit better, when the car is cold the ecu makes the car run a bit richer than when it is at operating temp. it is basically like having the choke on on an engine that does have fuel injection.

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