Flushing water from the radiator and block.

djj62478

Member

Feb 25, 2026

42

4

18

Nj

Yesterday at 6:07 PM

#1

• Yesterday at 6:07 PM

• #1

So when I first put the motor in my 90, I put water in the radiator this way if there were any leaks I would not have wasted coolant and also have it all over my driveway. Now I want to swap it over to coolant. What is the proper way to do this, do you just empty the radiator and overflow and refill?

 

nickyb

I gotta say i never painted my nuts, Never Ever

15 Year Member

Apr 3, 2009

3,026

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nevada

Yesterday at 6:52 PM

#2

• Yesterday at 6:52 PM

• #2

I personally would drain that water out and refill with distilled water. Run up to temp and then drain that,if any water is left it will mix with coolant and distilled water is what you want with coolant.

 

djj62478

Member

Feb 25, 2026

42

4

18

Nj

Yesterday at 7:08 PM

#3

• Yesterday at 7:08 PM

• #3

Does the block have to be drained? Thing is I already drained the radiator and removed the old coolant from the reservoir. I started filling up the radiator with coolant it was almost to the top then stopped and thought a minute does the block need to be drained? If so how do I do it and is there an easy way to do it?

 

DadLife0724

Advanced Member

Mar 22, 2024

385

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73

Cooperstown, PA

Yesterday at 7:35 PM

#4

• Yesterday at 7:35 PM

• #4

You would probably only have a couple quarts in the block. If you did what @nickyb said, you wouldn't need to worry about it. I mean, with only a couple quarts I probly wouldn't worry about it too much anyways, unless the water is absolutely filthy.

 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

Admin Dude

Jan 4, 1985

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Box behind Walmart

Yesterday at 7:49 PM

#5

• Yesterday at 7:49 PM

• #5

Stop by your local autoparts store and pickup a flush kit.

 

Reactions: DadLife0724

gkomo

now i can hopefully expect to receive the shaft

Aug 2, 2024

2,287

1,513

133

San Diego, CA

Yesterday at 9:39 PM

#6

• Yesterday at 9:39 PM

• #6

Reminds me I need to do a flush kit. My coolant was straight up brown when I replaced it during the supercharger install.