A.If you rebuild model year 2003 GM 4.8L, 5.3L or 6.0L VIN V, T and U truck engines, your customers may be unaware of new GM coolant fill procedures. The following is good information to duplicate and include with a rebuilt engine.

Following this procedure will ensure that the engine coolant system has been filled properly.

Improper coolant filling may occur following a condition where the engine coolant has been drained. If the cooling system is filled through the radiator neck and/or engine coolant overflow reservoir engine, overheating may result. When attempting to fill that way the engine coolant may not flow beyond the closed thermostat located on the lower engine at the radiator hose connection. The engine coolant level may appear to be full up to the radiator neck when actually the system may be 4-6 quarts low. If the engine is operated that way an engine overheating condition may occur.

GM offers the following information to correctly fill the cooling system on these engines.

1. Reposition hose clamp and remove the upper radiator hose.
2. Remove the coolant air bleed hose from the radiator.
3. Use a 50/50 mixture of DEX-COOL® antifreeze or equivalent and deionized water.
4. Slowly fill the cooling system through the upper radiator hose with 50/50 coolant mixture until the coolant comes out the coolant air bleed hose.
5. Connect the upper radiator hose to the radiator.
6. Install the upper radiator hose and reposition the clamp to the original position on the hose.
7. Connect the coolant air bleed hose to the radiator.
8. Fill the coolant overflow bottle to the full line.
9. Start engine and run at 2000-2500 rpm until the engine reaches normal operating temperature.
10. Allow engine to idle for 3 minutes.
11. Shut the engine off and allow to cool, top off coolant as necessary.
12. Check coolant for correct concentration.
13. Rinse away any excess coolant from the engine compartment.
14. Inspect cooling system for leaks.

NOTE: Tools required to do the procedure properly are J 26568 coolant & battery tester and a J 38185 hose clamp pliers.

Years	Models	Engine	Torque
1992-95	Mirage	4G1	14 ft.lb (20 Nm) plus 90 You May Also Like Brand Loyalty – is it a Thing of the Past? Engine Builder Attends SBI’s 40th Anniversary Gala Summer Vibes and a Dream Engine Giveaway Think You Got What it Takes to Brawl? Commentary Passion Runs Deep Having had the distinct opportunity to view this industry from my chair as editor of Engine Builder has certainly opened my eyes to a lot of great things this industry has going for it. However, my favorite thing about it – hands down – is the passion. Whether it’s passion for covering the industry (as By Greg Jones Mar 21, 2022 Having had the distinct opportunity to view this industry from my chair as editor of Engine Builder has certainly opened my eyes to a lot of great things this industry has going for it. However, my favorite thing about it – hands down – is the passion. Whether it’s passion for covering the industry (as we do), or passion for manufacturing components (as so many of our partners do), or passion for creating horsepower and engines (as all of our readers do) – there’s certainly no lack of passion here. That all said, where I’ve seen the most passion for what our industry is all about is on the track. That’s where the proverbial rubber meets the road, and where the manufacturing, the engines, the cars, and the people all come together to earn a longed-for result. Read Full Article More Commentary Posts PRI 2021: What a Show First things first – Happy New Year to you all. I sincerely hope you got to be with friends and family during the holidays and that you all had a safe and fun end to 2021. We’ve now officially welcomed 2022, and as the holidays have quickly come and gone, as they always do, I By Greg Jones Jan 20, 2022 New Year’s Resolution It’s crazy to think that 2021 is coming to a close. The days and weeks in a year always feel long, but the months and the year itself, absolutely fly by. It’s strange how that always is the case. There’s no stopping Father Time as they say! All we can do is forge ahead and By Greg Jones Dec 14, 2021 Not Your Father’s Engine Builder I’ve actually lost track of how long it’s been since people started claiming print was dead. It’s been a while! Now, I understand the ‘print is dead’ claim might be different for newspapers than it is for magazines, but I can tell you this – the content landscape has certainly been shifting. Related Articles – By Greg Jones Nov 22, 2021 Experience Always Wins Formula 1 racing often tells smaller stories within each individual race; the final stretches of the Russian Grand Prix proved in my eyes that experience always wins. By Greg Jones Oct 11, 2021 Other Posts Protect Yourself as a Small Business This month’s column is for all those folks in automotive performance with a small business, as well as those looking to get into this segment of the industry. Automotive performance is this gray area that comes with risks and rewards as well as customers who don’t know what they don’t know. If you’re not careful, By Nate Bush Apr 30, 2021 April Has Been Good to Me Two years ago this month, I was promoted to editor of this fine publication and brand we call Engine Builder. After having been in the managing editor role for the five years prior, I got my chance to run the ship, as they say, when Doug Kaufman accepted an editorial director role within Babcox Media By Greg Jones Apr 30, 2021 The EPA and Hot Rod Culture This is kind of a gray area for me. Obviously, being a passionate car guy who’s willing to throw turbochargers on anything and really enjoys performance, it creates this internal conflict between wanting to be somebody who participates in a greener view of the future and the well-being of my passion, career and industry. Related By Nate Bush Mar 24, 2021 One Year of COVID As we all know, March 2021 marks a full year since the Coronavirus began altering what we used to know as ‘normal life.’ I don’t think any of us will forget March 2020 when we began hearing that this then foreign flu strain was starting to make the rounds in the U.S. I remember we By Greg Jones Mar 24, 2021 Privacy Policy Terms of Use Copyright Babcox Media Inc. All rights reserved