Engine block coolant capacity
Thread Starter
Advanced
Joined: Nov 2013
Posts: 73
Likes: 2
From: Linköping
Engine block coolant capacity
Yet another coolant capacity thread... But I haven't found the answer by searching.
1975 L48
I need to know how much coolant the engine block alone takes. I want to treat the engine block with oxalic acid to remove any rust and I want to cap off all passages to radiator and heater core so that I treat the engine block only.
Cheers
Fredrik
1975 L48
I need to know how much coolant the engine block alone takes. I want to treat the engine block with oxalic acid to remove any rust and I want to cap off all passages to radiator and heater core so that I treat the engine block only.
Cheers
Fredrik
Thread Starter
Advanced
Joined: Nov 2013
Posts: 73
Likes: 2
From: Linköping
Thread Starter
Advanced
Joined: Nov 2013
Posts: 73
Likes: 2
From: Linköping
Pro
Joined: Jul 2021
Posts: 719
Likes: 156
Oxalic Acid:Sodium Carbonate
courtesy of CF member noonie ... I have relied upon the following several times and IT WORKS.
Unless a component is already so weak/worn that it's nearly scrap; it won't hurt it.
Search noonie's posts for more. search term 99-06-02-012D
Dunno block capacity. I've always done with engine running. The heat is an important part in driving the chemical reaction. The circulating/pumping action is as well.
Prestone used to make a cleaner for GM P/N 12346500.
It was also sold under Prestone P/N AS100 Heavy Duty Cooling System Cleaner
Here is the GM TSB and Instructions #99-06-02-012D (Online or at a GM dealer)
It is not made anymore but these are the components.
9 dry oz of Oxalic Acid (DAP Wood Bleach)
2 dry oz of Sodium Carbonate (Arm & Hammer Super Washing Soda)
-add-
FWIW above TSB covers vehicles with aluminum radiator and heater core.
Unless a component is already so weak/worn that it's nearly scrap; it won't hurt it.
Search noonie's posts for more. search term 99-06-02-012D
Dunno block capacity. I've always done with engine running. The heat is an important part in driving the chemical reaction. The circulating/pumping action is as well.
Prestone used to make a cleaner for GM P/N 12346500.
It was also sold under Prestone P/N AS100 Heavy Duty Cooling System Cleaner
Here is the GM TSB and Instructions #99-06-02-012D (Online or at a GM dealer)
It is not made anymore but these are the components.
9 dry oz of Oxalic Acid (DAP Wood Bleach)
2 dry oz of Sodium Carbonate (Arm & Hammer Super Washing Soda)
-add-
FWIW above TSB covers vehicles with aluminum radiator and heater core.
Last edited by ebbnflow; Dec 19, 2021 at 11:16 AM.
Thread Starter
Advanced
Joined: Nov 2013
Posts: 73
Likes: 2
From: Linköping
Cheers
Fredrik
Le Mans Master
Joined: Aug 2006
Posts: 7,411
Likes: 1,550
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
The total capacity for the radiator, the block and the heater core is 19 quarts.
Fill, drain and measure the radiator and you'll be close enough.
https://www.gmheritagecenter.com/gm-...tion-kits.html
Fill, drain and measure the radiator and you'll be close enough.
https://www.gmheritagecenter.com/gm-...tion-kits.html
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,036
Likes: 9,157
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
I just used the prestone stuff and added it and drove for a couple of days, completely drained and refilled and ran the prestone again. THen on the third lap I just ran straigght water and then kept flushing it until it was clear. THen took the radiator out and back flushed that until it was clear..... Refilled everything with premix 50-50 and every time I drain the block after that it was as green as the day it went in...
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
SAme here. Pull the T stat pour your sauce in and get it nice and hot...the open the pitcock, as it drains out keep adding water til youre happy. Reinstall Tstat and motor on
Good enough for me
Good enough for me