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05-11-2016, 08:42 PM
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#1 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Coolant overflow
So when my truck gets up to temp and driven for a while the radiator will have lost a decent amount of coolant once cooled. Obviously I need an overflow... is anyone using the factory radiator and cap with an overflow that seems to be functioning? I don't want to replace the radiator right now it's only 3 years old thanks in advance guys
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70 C10 working on a LSx swap  4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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05-11-2016, 10:17 PM
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#2 |
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Post Whore
  
Join Date: May 2015
Location: Alabama
Posts: 14,670
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Re: Coolant overflow
Are you loosing water out overflow tube or into engine? Probably not your radiator..have you changed the cap?
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05-11-2016, 10:41 PM
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#3 |
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Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: Coolant overflow
You don't necessarily need an over flow bottle. The full mark on a radiator without an overflow is several inches down from the cap, so if you fill it all the way to the top, it will puke out what it cant hold, after that it should be fine if it isn't overheating.
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
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05-12-2016, 11:33 AM
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#4 | |
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Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: Coolant overflow
Quote:
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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05-12-2016, 09:40 PM
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#5 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: Coolant overflow
I have changed the cap. Are there higher pressure caps available?
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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05-13-2016, 12:21 AM
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#6 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,670
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Re: Coolant overflow
I have a 25lb cap on mine..
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05-13-2016, 12:49 AM
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#7 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: Coolant overflow
I've always run a 16lb I believe.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  |
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05-13-2016, 08:35 AM
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#8 |
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Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: Coolant overflow
I use a 7# cap and 50 50 anti freeze with a catch can
I run a electric fan and A/C Are you sure you do not have any air trapped in your system
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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05-13-2016, 02:06 PM
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#9 |
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Registered User
Join Date: Aug 2012
Location: Indiana
Posts: 470
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Re: Coolant overflow
Engine has about 15-20 hours on it so I would think that the air bubbles would be gone. Where do you get a higher pressure cap
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70 C10 working on a LSx swap 4.8L MS3 edelbrock pro flo intake, pacesetter long tubes, 4l60e 2500 stall hoping the tranny holds up lol |
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05-13-2016, 03:12 PM
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#10 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Coolant overflow
Just for the sake of doing our part for the environment put a over flow on it. They are cheap enough and it will save you money in the long run. Just take the hose that it runs out of now and hook it to the over flow.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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05-13-2016, 04:02 PM
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#11 |
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Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,670
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Re: Coolant overflow
The air pockets solidaxle is talking about is in the engine..did you fill the engine through the top radiator hose until full? This will eliminate most of the air that's trapped..if you've ran it that long without it overheating I don't think you've got that problem..if its got air trapped it will immediately run hot and the thermostat doesn't open. Radiator caps are sold by parts stores everyday..from my research when doing my swap I found they recommend less than 20lb for older style engines and over 20lb for newer ls engines..doesn't mean a lower than 20lb won't work its got more to do with how much pressure your system can stand without problems and they also said get the biggest one you can find..my old 350 already had the 25lb on it so I just left it on. Like andy suggested get you a overflow tank..that way any coolant that goes out the overflow due to high pressure will be pulled back in when it cools off and the pressure drops...in theory..
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