What is total cooling system capacity? - Chevrolet Forum - Chevy Enthusiasts Forums

Go Back   Chevrolet Forum - Chevy Enthusiasts Forums > Current Chevy Trucks, SUV's, Crossovers & Vans > Tahoe & Suburban
Log In 

Tahoe & Suburban The power, space, and brutal towing ability make the Tahoe and its longer sibling, the Suburban, arguably the best full size SUV's on the market today.

2013 Chevrolet Suburban
Platform: GMT 400, 800, 900
Sponsored by: Dorman

LinkBack Thread Tools Search this Thread
Old 09-22-2009, 11:48 PM
CF Beginner
Join Date: Sep 2009
Posts: 6
Default What is total cooling system capacity?

The owners manual for my '03 Suburban says the cooling system capacity for a Vortec 5300 V8 with the Z vin # is 15.8 quarts. So I drained & flushed (3 times) the entire system over the weekend finally adding back 8 quarts concentrated Dex-Cool (not 50/50 premix) along with ~ 4-5 quarts water to bring the whole system up to the fill mark on the coolant tank. 8 quarts coolant should be a little over 50% concentration in 15.8 qt. system.

The only problem is that my antifreeze tester showed -19 degrees when finished, not -34 as you'd expect with a 50% concentration. Borrowed the neighbor's tester ... it too read -19 degrees. Had a shop do some other work today and asked them to check coolant strength. You guessed it ... minus 20 degrees.

According to the antifreeze tables I could find online, a -19 degree reading equates to roughly a 40% coolant concentration. 8 quarts is 40% of 20-quart system.

So my question is, is the owner’s manual wrong? Do I have more than 15.8 quarts in the Sub? My manual also carries cooling system specs for the Vortec 8100 V8, which as a coincidence is 20.7 quarts.

Thanks for the help.
Reply With Quote
Old 09-23-2009, 09:01 AM
CF Addict
Join Date: Feb 2008
Posts: 2,560
Default cap

these things are never 100% accurate and you never get 100% of the water out

just drain some fluid and add pure antifreeze then retest...
2005 Mazda Tribute (Molly)
2009 Tahoe LTZ (Mikayla)
2013 Tesla Model S85 (Mystique) 1 Billion Miles
Tesla Model X SUV
Tesla Saves Mother & Child in Landslide
Tesla Saved My Life - DreamWorks CEO
GM 2nd recall for fires
124 killed by GM. Will you be next?
Reply With Quote
Old 09-23-2009, 04:17 PM
tm4hammer's Avatar
CF Active Member
Join Date: Jun 2009
Location: Colorado
Posts: 159
Default tricky stuff

are you looking at the table that includes the rear cargo compartment aux. heater and plumbing and air condtioning or the table that has not got air or aux heater what i have seen is about a 2 1/2 quart differance between the one and the other dont know if that helps
Reply With Quote
Old 09-23-2009, 07:17 PM
CF Beginner
Join Date: Sep 2009
Posts: 6

Problem solved.

It took about 50 miles to do it, but the coolant reading is now better than -34 degrees. I was going to drain some and add back pure coolant tonight to fix the problem, but it checked out okay before I did that. I'm guessing the water/pure antifreeze installed this past weekend simply wasn't mixed together enough throughout the system to give an accurate reading until today.

So I'd say the owners manual capacity figure is correct.
Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
'00 Tahoe Total Blackout Hamron1775 General Tech 0 09-08-2009 02:41 PM
Trip counter switches back to total miles B_Van General Tech 0 12-01-2008 03:04 AM
low coolant light and total system shut down...what's going on? christiee Impala 2 02-15-2008 06:58 PM
total newbie question nighshifter Tahoe & Suburban 1 06-30-2007 09:06 AM

03, 06, 2002, 88, beretta, blazer, capacity, cobalt, concentration, coolant, cooling, impala, suburban, system, tahoe

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


All times are GMT -5. The time now is 03:06 AM.