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 > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 11-04-2019, 09:58 AM   #1
SunSoaked
Registered User
 
SunSoaked's Avatar
 
Join Date: Dec 2011
Location: Yuma Arizona
Posts: 1,525
Coolant evaporated?

Is it normal for 50/50 mix coolant to evaporate over time?
I've noticed my level slightly lower in my surge tank. I know it's not an engine issue. I don't have the issue on any of my other vehicles so I'm wondering if the "vented cap" on the surge tank is the culprit. Was this just a common maintenance issue back in the day?
SunSoaked is offline   Reply With Quote
Old 11-05-2019, 09:36 AM   #2
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,733
Re: Coolant evaporated?

Shouldn’t change,
Either it’s leaking somewhere, being burned away from a crack in the heads or your catch can is the culprit.
How big is your catch can?
How low do you keep the low level at?
Do you have an overflow hose on the vented cap or on the catch can?
geezer#99 is online now   Reply With Quote
Old 11-05-2019, 10:17 AM   #3
SunSoaked
Registered User
 
SunSoaked's Avatar
 
Join Date: Dec 2011
Location: Yuma Arizona
Posts: 1,525
Re: Coolant evaporated?

It's the OEM setup. It's obviously not a sealed system so it's open to the atmosphere. The cap has slots in it, kinda like a castle nut for lack of a better description.
Here in S. Arizona, it's dry and temps reach 115 daily in the summer. Most any liquid will evaporate over time. I just thought that glycol wouldn't?
I only fill the jug to the fill line that is maybe 20% of it's volume.
Attached Images
 
SunSoaked is offline   Reply With Quote
Old 11-05-2019, 10:31 AM   #4
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,733
Re: Coolant evaporated?

You got capacity.
Is that the cold line marking on the side?
geezer#99 is online now   Reply With Quote
Old 11-05-2019, 01:10 PM   #5
SunSoaked
Registered User
 
SunSoaked's Avatar
 
Join Date: Dec 2011
Location: Yuma Arizona
Posts: 1,525
Re: Coolant evaporated?

Yes, the cold line is on the front. After a month or two, the level usually drops about a quarter or half inch. Further research on the net revealed that it is normal for a small amount to evaporate over time. Maybe our 115 degree summer days have more of an effect than others.
SunSoaked is offline   Reply With Quote
Old 11-05-2019, 01:32 PM   #6
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,733
Re: Coolant evaporated?

To see if it’s evaporation you could put some coolant in a similar container and see what happens.
A gallon jug with a hole in the cap would work.
Put it on a high secure shelf to protect it from kids, pets and varmints.
geezer#99 is online now   Reply With Quote
Old 11-05-2019, 01:50 PM   #7
100%Chevy
Registered User
 
Join Date: Jun 2008
Location: Moss Point,Ms.
Posts: 1,439
Re: Coolant evaporated?

Glycol won't evaporate but the alcohol and water will
Replace it once a year to keep the mix correct.
Mike.
100%Chevy is offline   Reply With Quote
Reply

Bookmarks


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 10:20 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com