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#969833 - 04/26/13 01:47 PM Any ideas for coolant overflow bottle/cap?  
Joined: Jul 2012
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breakneck88 Offline
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breakneck88  Offline
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lehigh Valley pa
Why did you Chevy make such an awful overflow/cap setup? I bought n a new overflow any cap from a member here. It was brand new gm part. I bought it to replace my original overflow because the "threads" on the overflow were ripped of when I bought the car. So now I have a brand new one and still, the threads are messed up. During the summer last year I actually had water evaporate from the overflow.
Sooooooo, what mods have u done to make the overflow cap stay tight on that crappy plastic threads?
Any help us appreciated.

#969844 - 04/26/13 03:40 PM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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pacheco Offline
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pacheco  Offline
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Spring Hill,Fl
just need new overflow container


Bust your asx during the week..bust your knuckles on the weekend
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#969878 - 04/26/13 08:55 PM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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86ttop Offline
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86ttop  Offline
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Brooksville, Fl
go to Carlisle Swap meet and get one from Mike's Monte's, he is there as a vendor, good luck.


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#969881 - 04/26/13 10:13 PM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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breakneck88 Offline
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breakneck88  Offline
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lehigh Valley pa
I already have a new gm overflow. Still the same problem. Cheap plastic threads strip out on the bottle.

#969887 - 04/26/13 11:55 PM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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Richie Cat Offline
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Richie Cat  Offline
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Lake Ronkonkoma, N.Y.
Could it be the cap is split on the threaded area and you think the bottle is no good? Mine is original from 1983 with no problems.


83 SC, 355 w/TPI
#969888 - 04/27/13 12:21 AM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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pacheco Offline
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pacheco  Offline
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Spring Hill,Fl
The cap does not go on gorilla tight


Bust your asx during the week..bust your knuckles on the weekend
350 with vortec heads,Edelbrock intake,headers with 2.5"exhaust,SS sway bars,SS rims,spoiler,3:73 wit a POWERTRAX,tubular rear control arms,JEG'S trany,GBODY front brace,umi rear chassis brace.
http://www.cardomain.com/ride/3193776
#969891 - 04/27/13 01:15 AM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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breakneck88 Offline
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breakneck88  Offline
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lehigh Valley pa
They cap on bottle are both new. I think I'm going to check out the local pull a part and see what other vehicles I can borrow from. It's just a bad design or I have really bad luck. Both bottles stripped out. Maybe I might have over tightened at one point. But it's driving me nuts. I don't know if I have a bad headache gasket or the water in the coolant is evaporated.

#969931 - 04/27/13 02:32 PM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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Jameson Offline
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Jameson  Offline
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Elizabeth City, NC
The cap doesn't go on tight, Its a vented cap. Just needs to be finger tight if that. And you also cant have a sealed catch can, this coolant system isn't setup for that. Air and vapor vent from the system Via that tank. That's why it evaporates, Also coolant doesn't evaporate, Are you running straight water?


1988 Monte Carlo SS Eaton 112 5.3/T56 swap, Way to many mods to list.
2015 GMC Sierra Denali



#969990 - 04/28/13 02:09 AM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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breakneck88 Offline
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breakneck88  Offline
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lehigh Valley pa
No, I'm running 50/50. It's definitely evaporated. There is green on my hood right above the bottle. I thought the same thing. I guess the water in the mix evaporates. I figured out a fix. I found some tubing that fits dug inside the threaded part of the bottle. I just need to make a small lip that will keep it from falling inside the bottle. That should hep keep the threads rigid. I know this might sound a little crazy considering it's just a plastic bottle. But I love my car and I hate leaving any part of my projects unfinished or done half way. I've done that with other cars. Then when you look at it, it looks like a bunch of quick fixes. This car will be different. I really love my aero.

#970038 - 04/28/13 03:11 PM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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Richie Cat Offline
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Richie Cat  Offline
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Lake Ronkonkoma, N.Y.
Could you post a picture of the bottle?


83 SC, 355 w/TPI
#970107 - 04/29/13 01:21 AM Re: Any ideas for coolant overflow bottle/cap? [Re: Richie Cat]  
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CYACOP Offline
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CYACOP  Offline
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Dallas, TX
Electrical tape wrap on threads in the right direction

#970125 - 04/29/13 09:53 AM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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Richie Cat Offline
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Richie Cat  Offline
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Lake Ronkonkoma, N.Y.
Originally Posted By: breakneck88
I figured out a fix. I found some tubing that fits dug inside the threaded part of the bottle. I just need to make a small lip that will keep it from falling inside the bottle. That should hep keep the threads rigid.

Clean and scuff up the bottle and tubing and put some epoxy on then. Don't use the 5 minute stuff. You should be OK with the fix.


83 SC, 355 w/TPI
#970163 - 04/29/13 06:46 PM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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SKIDMARK Offline
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SKIDMARK  Offline
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New Bern NC
I have a spare coolant bottle you can have to try. Your about 1 hour from me.

#970186 - 04/29/13 10:53 PM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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AkronAero Offline
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AkronAero  Offline
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Akron OH
Suggest its not evaporating.

The radiator cap keeps pressure on the fluid, about 15 psig. This converts to about 45 deg F increase in boiling point (about 260 deg), but again this depends on the setting and conditon of the radiator cap. If there is air inside, its the first to be purged. The gas and then expanded liquid are pushed past the cap and into the reservoir, which operates at atmospheric pressure (so it doesn't fight the radiator) thanks to a small weep hole (sometimes) an overflow line and the aforementioned messed up GM threads (LOL!). Whe the car is off, the liquid contracts as it cools and pulls the liquid back into the radiator.

Problem 1. There may be a leak or poor fitting in the line between the radiator and the overflow. Imagine that when the radiator is cooling it pulls a vacuum on the line running to the overflow. But the line has a small leak and instead air is pulled in to the radiator, leaving excess fluid in the overflow and a large airpocket above the radiator. On running the car the next day, the expanding fluid pushes trapped gas out, not a small volume as with the expanding liquid, but a very large volume which blows through the filled reservoir and is pressured (bubbles) out the cap. Then sucks more in when its cooling on the down cycle. I mentioned this first because I have seen this with several cars.... This is only observable when the car first heats up. Not a problem once running.

Problem 2. Failed radiator cap (pressure control) or low antifreeze concentration (causing a lower boiling point and higher pressure) or failed thermostat running high will all cause boiling continually during operation. If you see venting or bubbles going into or out of your overflow tank during operation this is your problem. Boiling will create high volume gas stream which will blow fluid out the reservoir also. Water that is boiling will create (at stp) 1600 fold increase in volume.... enough to blow liquid though the reservoir cap. Lastly, ensure you have liquid in your reservoir. Its cooler and will condense any hot fluid/gas as it exits, making it available for recovery.


Again, coolant bottles are open and run at atmospheric pressure.
HTH?

#970317 - 05/01/13 09:19 AM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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Slackerzinc Offline
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Slackerzinc  Offline
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Saint John, New Brunswick
Canton racing sells a real nice aluminum overflow tank

#970888 - 05/06/13 04:56 PM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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breakneck88 Offline
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breakneck88  Offline
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lehigh Valley pa
I think I have a leak somewhere in the cooling system. I had to top it off again. All hoses look fine as does thermostat area. Nothing on the water pump and it's a new radiator. Sooooooo looks like the heater core or a head gasket. Oh well. Almost done with the new motor. As long as it makes it to then. I do like the epoxy idea. I could put vasoline on the inside of the cap or coat the bottle threads and cover it with oily plastic wrap. Then remove when dry.

#971167 - 05/09/13 07:45 AM Re: Any ideas for coolant overflow bottle/cap? [Re: breakneck88]  
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84LS1T56SS Offline
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Central, Arkansas
If you have green(coolant) on the bottom of the hood, then the radiator cap isn't holding the pressure it should be or you have motor problems causing the system to have way too much presure on it.



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