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07-23-2022, 05:36 PM | #1 |
Registered User
Join Date: Apr 2019
Location: SC
Posts: 74
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Help with expansion tank
I’ve installed a coolant overflow/expansion tank supposedly made for LS1 engine swaps. I’m a bit confused on the radiator caps and actual hose routing. I’ve followed the attached diagram below, along with another diagram showing how I routed my hoses based on the expansion tank barbs, aftermarket radiator barbs and Vintage Air system I installed. I idled the engine as a quick test with the caps off for now, and idling it’s sitting around 185 degrees with the fan popping on low speed around 190 degrees . I’m not sure if I need pressurized cap on both tanks or just 1. Are there any issues with the way the hoses are run?
Last edited by SilverGT3RS; 07-24-2022 at 06:22 AM. |
07-23-2022, 05:40 PM | #2 |
Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 2,090
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Re: Help with expansion tank
On my LS swaps I just run a basic over flow tank from Speedway. It's not pressurized. I run a 15 lb radiator cap.
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07-23-2022, 11:13 PM | #3 |
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Join Date: Mar 2020
Location: The Woodlands,Tx
Posts: 585
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Re: Help with expansion tank
I also just ran a plastic oem overfow tank from rad to tank with a rubber hose. No issues in Houston at all.
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07-24-2022, 06:10 PM | #4 |
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Join Date: Sep 2020
Location: Cleveland, Ohio
Posts: 543
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Re: Help with expansion tank
Count me in with the others. Just a basic overflow tank and an 18 lb. cap. I did have one of those small stainless versions and it was always either empty or overflowing. I put a normal size on and it works great.
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07-25-2022, 10:47 AM | #5 |
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Join Date: Mar 2020
Location: The Woodlands,Tx
Posts: 585
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Re: Help with expansion tank
looking at your hand drawn diagram. I don't know much about vintage air BUT you show a crossover pipe and a shut off valve that then results in the heater hose flowing thru your overflow tank. If you have it set up this way then i think you need a pressure tank. I think you can get rid of the tee and let it flow back into the engine. My set up doesn't have but a heater hose in and one out no shut off or tees. I think vintage air is doing this because they want the hot antifreeze not to run through the heater core while the ac is cooling. I am in the process of completing my ac system using original parts so I may end up doing what you did if the coolant is stopping me from getting cold a/c.
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03-17-2023, 01:02 PM | #6 | |
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Join Date: Nov 2000
Location: Wheatfield IN, USA
Posts: 1,118
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Re: Help with expansion tank
Quote:
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1972 K5 Build - plans - LS3-6L80e-One Tons..... 1971 CREWMAX Build.....at body shop for couple more years |
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03-17-2023, 01:05 PM | #7 |
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Join Date: Nov 2000
Location: Wheatfield IN, USA
Posts: 1,118
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Re: Help with expansion tank
I just relooked at the install instructions and don't see anything in regards to the use of a TEE ....??
https://www.vintageair.com/instructions_pdf/751170.pdf
__________________
1972 K5 Build - plans - LS3-6L80e-One Tons..... 1971 CREWMAX Build.....at body shop for couple more years |
03-18-2023, 08:36 AM | #8 | |
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Join Date: Sep 2020
Location: Cleveland, Ohio
Posts: 543
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Re: Help with expansion tank
Quote:
I did not put a tee in front of the VA shut off valve and mine works fine. |
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03-19-2023, 05:10 PM | #9 | |
BMW & ASE Master Certified
Join Date: Feb 2004
Location: Houston, Texas
Posts: 1,266
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Re: Help with expansion tank
Quote:
On my 5 series bmw LS1 swap, at a long stop light or going through a drive through, I could watch the aftermarket coolant temp gauge start to rise, when I turn on the heater (not even, it opens the water valve and lets coolant flow in the heater core. almost instantly, the coolant temp dropped. I could blip the throttle some and it would also cool it down... Since I havnt installed the cross over tube, I just leave 1 valve open so the flow is like factory.
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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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