Coolant flush

Heads, valves, pistons, rods, crankshaft, etc...

Moderators: Helpinators, Moderators

Post Reply
BSOD2600
Fourth Gear
Posts: 1636
Joined: Tue Sep 12, 2006 6:49 am
Location: Seattle, WA

Coolant flush

Post by BSOD2600 »

During the engine swap, I've noticed some of the coolant draining out is a light brown color. Obviously need to flush everything out.

To flush the coolant passages in the engine, I assume I have to remove the thermostat, and then stick a hose in the top coolant tube? Probably should flow some water from the condenser tank too on top. Anything else to be done?

'11 WRX Limited
'94 SS | 3" TBE, 07 TMIC, TD05H-16G, Revtronix Stage 2, Walbro -- Sold
'94 TW | R.I.P.
kimokalihi
Fifth Gear
Posts: 8360
Joined: Mon Nov 06, 2006 3:41 am
Location: Tenino, WA

Post by kimokalihi »

I've never done a coolant flush before. Do you only use water or is there another chemical you can use to clean it out better?
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson
Legacy777
Site Admin
Site Admin
Posts: 27884
Joined: Tue Oct 15, 2002 11:37 am
Location: Houston, Tx
Contact:

Post by Legacy777 »

What you described is about right to flush the engine.
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT

If you need to get a hold of me please email me rather then pm
94.GT.Wagon
First Gear
Posts: 120
Joined: Tue Sep 16, 2008 3:42 am
Location: Kalamazoo, MI

Post by 94.GT.Wagon »

Flushing out the radiator and heater core would be a wise idea while you're at it, but you probably already know that.
Todd

2002 Legacy GT Wagon 2.5/5mt
1999 Legacy Outback Limited Wagon 2.5/4eat(wife)
1998 Forester S 2.5/4eat
1972 Buick Electra Limited 455/TH400
1988 Jeep Grand Wagoneer 360/TF727
kimokalihi
Fifth Gear
Posts: 8360
Joined: Mon Nov 06, 2006 3:41 am
Location: Tenino, WA

Post by kimokalihi »

So just water then?
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson
ericem
Fifth Gear
Posts: 3242
Joined: Mon Oct 16, 2006 9:44 pm
Location: Toronto,ON Canada

Post by ericem »

i used only water and i am still seeing a little bit of debree. I am going to bring my car to a dealer and get it flushed as well as replace the thermostat as i think my new one is defective.
1993 Subaru Legacy L AWD Wagon R.I.P
1994 Subaru Legacy SS R.I.P :(
2004 Nissan Titan LE 4X4
2007 Subaru Legacy GT :)
kimokalihi
Fifth Gear
Posts: 8360
Joined: Mon Nov 06, 2006 3:41 am
Location: Tenino, WA

Post by kimokalihi »

Why do you think it's defective? Is it OEM?
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson
ericem
Fifth Gear
Posts: 3242
Joined: Mon Oct 16, 2006 9:44 pm
Location: Toronto,ON Canada

Post by ericem »

yes and it seems like the car only overheats a slight bit but not enough to show on the needle.
1993 Subaru Legacy L AWD Wagon R.I.P
1994 Subaru Legacy SS R.I.P :(
2004 Nissan Titan LE 4X4
2007 Subaru Legacy GT :)
Skruyd
Second Gear
Posts: 263
Joined: Mon Sep 29, 2008 2:36 am
Location: Clarksville, tn
Contact:

Post by Skruyd »

I use CLR to flush the coolant passages. Really REALLY cleans everything out.
91 Subaru Legacy SS (Driving) 3"TBE, Vrg FCD, 440cc, HKS Safc, Vf10, ebay FMIC, Jecs
92 Toyota Corolla (fixing then selling)
06 ZZR600
kimokalihi
Fifth Gear
Posts: 8360
Joined: Mon Nov 06, 2006 3:41 am
Location: Tenino, WA

Post by kimokalihi »

What is CLR?
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson
Skruyd
Second Gear
Posts: 263
Joined: Mon Sep 29, 2008 2:36 am
Location: Clarksville, tn
Contact:

Post by Skruyd »

kimokalihi wrote:What is CLR?
house hold cleaner. Calcium Lime Rust cleaner is what it is. I just put that in the system and let it run around for about 15 to 20 minutes. Then let that drain and run water through the system open while the motor is on.
91 Subaru Legacy SS (Driving) 3"TBE, Vrg FCD, 440cc, HKS Safc, Vf10, ebay FMIC, Jecs
92 Toyota Corolla (fixing then selling)
06 ZZR600
Post Reply