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06-09-2019, 02:02 AM
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#1 |
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Registered User
Join Date: Apr 2019
Location: SC
Posts: 74
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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! |
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06-09-2019, 07:36 PM
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#2 |
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BMW & ASE Master Certified
Join Date: Feb 2004
Location: Houston, Texas
Posts: 1,266
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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 |
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06-09-2019, 07:54 PM
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#3 |
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Post Whore
  
Join Date: May 2015
Location: Alabama
Posts: 14,671
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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 |
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06-12-2019, 03:04 PM
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#4 |
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Registered User
Join Date: May 2013
Location: Mississippi
Posts: 501
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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 |
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06-16-2019, 12:28 AM
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#5 |
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Registered User
Join Date: Jun 2016
Location: American Canyon, CA
Posts: 253
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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.
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