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 09-23-2019, 05:26 PM   #1
MDPotter
Registered User
 
MDPotter's Avatar
 
Join Date: Aug 2018
Location: Western Colorado
Posts: 368
What to do with steam line?

I had done some research months ago on how to deal with the steam line on my engine but I'm not sure if my plan will work. I don't plan on buying a radiator that has the steam inlet and would rather not have one welded in because it will probably void the warranty. I don't quite understand what happens with the steam lines either. I bought the Dorman 47112 tee so I can tap into a heater hose line, but won't that allow hot coolant to run into the steam line? If so, is that an issue? If it's not an issue, should I tee into the return line?

I have always had this idea that the steam line was basically a vent and that it didn't have coolant running through it so it needed to have a clear outlet such as just beneath the cap on the radiator tank.
__________________
1968 GMC C15 - Gen III 6.0 Restomod in progress http://67-72chevytrucks.com/vboard/s...d.php?t=772047
1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632
2016 Sierra 1500 All Terrain SLT - 33's, leveling kit, muffler delete
MDPotter is offline   Reply With Quote
Old 09-23-2019, 07:25 PM   #2
sprint_9
Registered User
 
sprint_9's Avatar
 
Join Date: Nov 2012
Location: 9
Posts: 759
Re: What to do with steam line?

The steam line is there to help carry away any steam or air build up in the heads created from hot spots. It will have coolant flowing in it. From what Ive read is the best routing is for it to have a path to the radiator with constant coolant flow. This way any steam can be burped off with the radiator cap.

Now if I remember correctly there is something older, like a trailblazer or something that ran the steam port down by the heater hoses, I dont remember exactly where it went but it was in that area. So you would probably be ok with your plan.

I think a better alternative is tapping the back of the upper radiator hose port on the water pump and threading it for a barb. This gives it a good path to the radiator with good flow, and is nice and clean. There have been a few on here do this including myself. Here is a pic of mine.
Attached Images
 
sprint_9 is offline   Reply With Quote
Old 09-23-2019, 08:38 PM   #3
mongocanfly
Senior Member
 
Join Date: May 2015
Location: Alabama
Posts: 9,607
Re: What to do with steam line?

On my C30 I ran it into the water pump as well.....on the IH I'm running it into the top radiator hose....I think as long as it's got somewhere to go itll be ok
__________________
Mongo...aka Greg

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
2013 GMC Z71..daily driver
mongocanfly is online now   Reply With Quote
Old 09-24-2019, 09:18 AM   #4
MDPotter
Registered User
 
MDPotter's Avatar
 
Join Date: Aug 2018
Location: Western Colorado
Posts: 368
Re: What to do with steam line?

Thanks guys. If I end up with a radiator without a steam inlet, I'll know how to deal with it.
__________________
1968 GMC C15 - Gen III 6.0 Restomod in progress http://67-72chevytrucks.com/vboard/s...d.php?t=772047
1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632
2016 Sierra 1500 All Terrain SLT - 33's, leveling kit, muffler delete
MDPotter is offline   Reply With Quote
Old 09-25-2019, 06:23 PM   #5
bigmoe
Registered User
 
Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 303
Re: What to do with steam line?

I heard it works better if it's routed into somewhere higher, especially to get trapped air out of an engine that's just been filled with coolant. I've seen many that have purchased a T fitting for the upper rad hose. Someone on here will respond with a pic and/or part source.
bigmoe is offline   Reply With Quote
Old 09-25-2019, 07:12 PM   #6
mongocanfly
Senior Member
 
Join Date: May 2015
Location: Alabama
Posts: 9,607
Re: What to do with steam line?

I simply made my own
Attached Images
 
__________________
Mongo...aka Greg

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
2013 GMC Z71..daily driver
mongocanfly is online now   Reply With Quote
Old 09-26-2019, 06:01 PM   #7
bigmoe
Registered User
 
Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 303
Re: What to do with steam line?

Here is the supplier I was thinking about. Jagsthatrun.com
Attached Images
 
bigmoe is offline   Reply With Quote
Old 09-26-2019, 06:53 PM   #8
MDPotter
Registered User
 
MDPotter's Avatar
 
Join Date: Aug 2018
Location: Western Colorado
Posts: 368
Re: What to do with steam line?

The Jagsthatrun tees are nice, but they seem pretty expensive to me for what they are. I plan on utilizing a steam port on the radiator or getting a cheaper plastic tee for the upper hose.
__________________
1968 GMC C15 - Gen III 6.0 Restomod in progress http://67-72chevytrucks.com/vboard/s...d.php?t=772047
1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632
2016 Sierra 1500 All Terrain SLT - 33's, leveling kit, muffler delete
MDPotter is offline   Reply With Quote
Old 09-28-2019, 11:47 PM   #9
87chevy.com
Registered User
 
87chevy.com's Avatar
 
Join Date: Feb 2004
Location: Houston, Texas
Posts: 973
Re: What to do with steam line?

I had a stock 454 radiator, probably same fittings and everything but the size of the core. Simply connected the steam line to the radiator on the passenger below the cap. Had it that way for 7 years as a daily.
__________________
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
A poor man buy's it twice
87chevy.com is offline   Reply With Quote
Old 09-29-2019, 10:30 AM   #10
Willie Makeit
Registered User
 
Willie Makeit's Avatar
 
Join Date: Oct 2013
Location: Alabama
Posts: 972
Re: What to do with steam line?

seems a lot of folks are hesitant to drill and tap the water pump? why is that? seems the easiest to route and to make for a cleaner looking install.
Willie Makeit is offline   Reply With Quote
Old 09-29-2019, 10:33 AM   #11
mongocanfly
Senior Member
 
Join Date: May 2015
Location: Alabama
Posts: 9,607
Re: What to do with steam line?

Willie...Ive found that some water pumps are very thin walled...hard to get a good thread in it
__________________
Mongo...aka Greg

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
2013 GMC Z71..daily driver
mongocanfly is online now   Reply With Quote
Old 09-29-2019, 01:51 PM   #12
ls1nova71
Senior Member
 
ls1nova71's Avatar
 
Join Date: Dec 2009
Location: Independence Mo
Posts: 3,713
Re: What to do with steam line?

I've drilled and tapped the water pump before, but my only reservation about it is what to do if that water pump ever decides to crap the bed in the middle of nowhere. I usually carry tools to change one, but dont generally carry a drill and tap. But I drive my cars, so that's why I like to keep them closer to stock so I can get replacement parts easily.
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10 (avatar truck)
http://ls1tech.com/forums/conversion...71-c-10-a.html
ls1nova71 is offline   Reply With Quote
Old 09-30-2019, 08:20 AM   #13
Willie Makeit
Registered User
 
Willie Makeit's Avatar
 
Join Date: Oct 2013
Location: Alabama
Posts: 972
Re: What to do with steam line?

Quote:
Originally Posted by ls1nova71 View Post
I've drilled and tapped the water pump before, but my only reservation about it is what to do if that water pump ever decides to crap the bed in the middle of nowhere. I usually carry tools to change one, but dont generally carry a drill and tap. But I drive my cars, so that's why I like to keep them closer to stock so I can get replacement parts easily.
Excellent point that I never thought of.
Willie Makeit is offline   Reply With Quote
Old 09-30-2019, 03:58 PM   #14
ls1nova71
Senior Member
 
ls1nova71's Avatar
 
Join Date: Dec 2009
Location: Independence Mo
Posts: 3,713
Re: What to do with steam line?

I know if you had to swap pumps, you could always cap the steam line off in a pinch, but I would just rather not have to mess with it. Maybe that's why I've never had to swap a pump out on a trip? And maybe I just jinxed myself? LOL!
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10 (avatar truck)
http://ls1tech.com/forums/conversion...71-c-10-a.html
ls1nova71 is offline   Reply With Quote
Old 09-30-2019, 07:46 PM   #15
kipps
Registered User
 
Join Date: Jul 2014
Location: North-central Virginia
Posts: 397
Re: What to do with steam line?

Quote:
Originally Posted by ls1nova71 View Post
...my only reservation about it is what to do if that water pump ever decides to crap the bed in the middle of nowhere....I drive my cars, so that's why I like to keep them closer to stock so I can get replacement parts easily.
Totally agree with this sentiment. The common replacement parts of a vehicle need to be kept stock. A goal for anyone doing a LS swap, is that the drivetrain should be as easy to service and repair as the donor vehicle would have been.
__________________
1987 V20 truck, with a 2010 LMG 5.3, and a sm465 tranny.
kipps is offline   Reply With Quote
Old 10-04-2019, 07:11 AM   #16
jnickell41
Registered User
 
Join Date: Aug 2015
Location: Farmington Hills
Posts: 19
Re: What to do with steam line?

I also tapped the water pump. I also added a plastic tee that fits the heater hose to my roadside parts box. That way if the water pump has to be replaced while away, I can splice into the heater hose and have a place for the steam hose.
jnickell41 is offline   Reply With Quote
Old 10-04-2019, 03:49 PM   #17
skyphix
Registered User
 
Join Date: Sep 2018
Location: Brooklin, ME
Posts: 248
Re: What to do with steam line?

Before I decided to just use a radiator out of an LS equipped vehicle, I was going to use this.

https://www.amazon.com/Dorman-902-99...0218488&sr=8-4


seems weird to use VW parts on a chevy truck, but beggers can't be choosers...
__________________
Eric
1980 C10 SWB
skyphix is offline   Reply With Quote
Old 10-11-2019, 02:40 AM   #18
prodjay10
Registered User
 
Join Date: Jun 2016
Location: Phoenix AZ
Posts: 254
Re: What to do with steam line?

Wouldn’t your heater core have constant coolant flow? If I remember correctly, there is no shut off valve.

Anyone seen the four seasons version of that tee? I’m trying to find it but can’t.
prodjay10 is offline   Reply With Quote
Old 10-11-2019, 04:49 AM   #19
ls1nova71
Senior Member
 
ls1nova71's Avatar
 
Join Date: Dec 2009
Location: Independence Mo
Posts: 3,713
Re: What to do with steam line?

67-72 Factory air trucks have a shut off valve as do most aftermarket AC units.
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10 (avatar truck)
http://ls1tech.com/forums/conversion...71-c-10-a.html
ls1nova71 is offline   Reply With Quote
Old 10-11-2019, 01:28 PM   #20
bigmoe
Registered User
 
Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 303
Re: What to do with steam line?

This is the one I bought on Ebay that I plan to use. It will allow the coolant to always circulate but allow you to shut off the supply to the heater core. I probably won't even hook up a cable. There's many versions if you search bypass heater valve but this one was pretty inexpensive.
Attached Images
 

Last edited by bigmoe; 10-11-2019 at 01:30 PM. Reason: add more
bigmoe is offline   Reply With Quote
Old 10-11-2019, 07:48 PM   #21
sweetk30
selective wrench turner guy
 
sweetk30's Avatar
 
Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,198
Re: What to do with steam line?

Quote:
Originally Posted by bigmoe View Post
This is the one I bought on Ebay that I plan to use. It will allow the coolant to always circulate but allow you to shut off the supply to the heater core. I probably won't even hook up a cable. There's many versions if you search bypass heater valve but this one was pretty inexpensive.
ebay item # or link please .
__________________
77-k30lb BIG truck build .
87-k30lb budget beater build .
85-k30lb the plow machine build .
85-c10sb summer fun toy .
-----------------------------
HOLLEY SNIPER efi = worst case of p.i.t.a i ever had .

EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
sweetk30 is offline   Reply With Quote
Old 10-11-2019, 08:22 PM   #22
ls1nova71
Senior Member
 
ls1nova71's Avatar
 
Join Date: Dec 2009
Location: Independence Mo
Posts: 3,713
Re: What to do with steam line?

That looks just like the heater shut off on an LLV, the small postal trucks that I work on every day. LOL!
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10 (avatar truck)
http://ls1tech.com/forums/conversion...71-c-10-a.html
ls1nova71 is offline   Reply With Quote
Old 10-11-2019, 08:25 PM   #23
ls1nova71
Senior Member
 
ls1nova71's Avatar
 
Join Date: Dec 2009
Location: Independence Mo
Posts: 3,713
Re: What to do with steam line?

HA! It is! That's too funny.
Attached Images
 
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10 (avatar truck)
http://ls1tech.com/forums/conversion...71-c-10-a.html
ls1nova71 is offline   Reply With Quote
Old 10-11-2019, 08:37 PM   #24
FAKKY
Registered User
 
Join Date: Sep 2016
Location: Redington Beach
Posts: 838
Re: What to do with steam line?

IM probably going to use this for both my TEMP sensor and steam line.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Top for 1 and Ill drill and tap the flat flange for the other
__________________
FAKKY 57 PANEL BUILD
FAKKY is offline   Reply With Quote
Old 10-11-2019, 09:56 PM   #25
prodjay10
Registered User
 
Join Date: Jun 2016
Location: Phoenix AZ
Posts: 254
Re: What to do with steam line?

FAKKY I like it. Thanks.

That way I can put a valve on the heater core if I have to.
prodjay10 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 06:20 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com