The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain > LSx Swaps

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-09-2019, 02:02 AM   #1
SilverGT3RS
Registered User
 
Join Date: Apr 2019
Location: SC
Posts: 61
2003 LQ9, Entropy and Exp. Tank

Trying to figure out if I need to go ahead and run an expansion tank like the factory did on my new Entropy radiator. I went to electric fans, and its a 2003 LQ9 with and new LS radiator from Entropy.

From what I can tell, the cooling system is supposed to run pressurized at the expansion tank, or at least looking at the diagrams it appears thats the way it was originally set up.

The expansion tank keeps the motor from getting an air bubble that could hamper the cooling, correct?

Any help would be appreciated!
SilverGT3RS is offline   Reply With Quote
Old 06-09-2019, 07:36 PM   #2
87chevy.com
BMW & ASE Master Certified
 
87chevy.com's Avatar
 
Join Date: Feb 2004
Location: Houston, Texas
Posts: 1,255
Re: 2003 LQ9, Entropy and Exp. Tank

Ran stock 87 non pressurized tank .... aka stock reservoir.. for 7 years no problem. People have problems when they don't bleed the system from the start.
__________________
1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes
1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit

New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD

A poor man buy's it twice

finally got my domain name back, 87chevy.com.... site rework in progress
87chevy.com is offline   Reply With Quote
Old 06-09-2019, 07:54 PM   #3
mongocanfly
Post Whore

 
mongocanfly's Avatar
 
Join Date: May 2015
Location: Alabama
Posts: 14,558
Re: 2003 LQ9, Entropy and Exp. Tank

I'm also using the 81 overflow tank on mine..no issues...
__________________
Mongo...aka Greg

RIP Dad
RIP Jesse

1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598
Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334
Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563
2023 Chevy Z71..daily driver
mongocanfly is offline   Reply With Quote
Old 06-12-2019, 03:04 PM   #4
Nodnarb76
Registered User
 
Nodnarb76's Avatar
 
Join Date: May 2013
Location: Mississippi
Posts: 501
Re: 2003 LQ9, Entropy and Exp. Tank

I've been running a OEM overflow tank with an Entropy radiator/Cooling fans myself for about 3 years with my swap. you should be fine.
__________________


1987 R20 Suburban LQ4/4L80e swap: http://67-72chevytrucks.com/vboard/s...d.php?t=693824
Nodnarb76 is offline   Reply With Quote
Old 06-16-2019, 12:28 AM   #5
Ghost's68
Registered User
 
Ghost's68's Avatar
 
Join Date: Jun 2016
Location: American Canyon, CA
Posts: 253
Re: 2003 LQ9, Entropy and Exp. Tank

My buddy and I knocked out this over flow tank from left over intake tubing we had laying around. I’m running an LS3 with and Entropy Radiator and over flow tank. No issues with temps. Highest I seen was 195*. On a side note run green antifreeze if you run a overflow tank.
Ghost's68 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 Off

Forum Jump


All times are GMT -4. The time now is 01:43 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com