Antifreeze Vanishing - Chevy Impala SS Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 23 (permalink) Old 11-25-2016, 07:30 PM Thread Starter
Senior Member
 
Join Date: Aug 2001
Location: ny
Posts: 660
 
Antifreeze Vanishing

I'm losing 2 gallons of antifreeze a year, and I only drive 3000 miles annually. It's not on the ground. It's not in the passenger compartment. The exhaust isn't white.

The oil looks ok, but I need to change the oil, and send it out for analysis. Otherwise there is no way to tell if antifreeze is in the oil.

The motor never had a major overheat. It's 100% bone stock. Never opened up. Original opti, original everything.

Is there any other place the antifreeze can be going ? Or is it time to pull the heads?

94 + 95 + 96 = 3
the blur is offline  
Sponsored Links
Advertisement
 
post #2 of 23 (permalink) Old 11-25-2016, 08:08 PM
Senior Member
 
Join Date: Jan 2001
Location: St. Louis
Posts: 6,337
 
No on the pulling heads yet. 10 hits in .12 seconds with a search, "Pinhole"

Chevy Impala SS Forum - Search Results

Otherwise, if it took a full year with that few miles to discover that much loss, then suspect a simple open break in the system evaporating the water, v. an active leak under power. Maybe busted crossover tube grommet(s), crap cap, split tank seam, warped gooseneck....

Have you filled it back up with distilled water, bled it, and run it really really hot to see if it blows out somewhere under pressure? You have to be quick - pinholes close in a second.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, SLP SS, 3000 Edge, F/HO bars, METCO extendeds and CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: SS Bars, METCO LCAs, Koni Reds, PowerTrax No-Slip
96 Black is offline  
post #3 of 23 (permalink) Old 11-26-2016, 03:39 PM
HUF
Senior Member
 
HUF's Avatar
 
Join Date: Aug 2009
Location: Western Massachusetts
Posts: 967
 
Radiator side tanks are plastic. The inlet one (driver side) develops a vertical crack on the upper surface facing the grill. The crack opens up when the coolant is hot and you will not see the leak while driving. I have replaced the side radiator tanks on both my Cadillacs.

I doubt you could lose 2 gallons that way, though. Wrap up whatever hose connections you can access with toilet paper to catch the leaking coolant. Say, the connections at the heater core, plastic T, etc. This is a low-tech solution.

There’s nothing as permanent as a temporary solution.

1995 Cadillac Fleetwood Brougham 118,XXX miles.

Last edited by HUF; 11-26-2016 at 07:56 PM.
HUF is offline  
 
post #4 of 23 (permalink) Old 11-26-2016, 04:37 PM
Senior Member
 
Join Date: Oct 2009
Location: northeast
Posts: 2,591
 
2 gallons and 3K miles .. you got me on that one .

leaks will show when the engine is cold and has been sitting several hours.

cast iron heads/gaskets on these are tough compared to aluminum.

install some UV dye then when cold using a UV flash light look for the dye showing.

if its burning the coolant the spark plug will be white and very clean compared to the other plugs. spark plugs should be brown ..
j cat is offline  
post #5 of 23 (permalink) Old 11-26-2016, 10:41 PM
Senior Member
 
Join Date: Jul 2005
Location: Los Angeles
Posts: 3,425
 
It is possibly leaking from the heater core and exiting thru the condensation drain unnoticed. Worth a check. As stated, a pressure test is on order.

Jim B.

'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.
fbi9c1 is offline  
post #6 of 23 (permalink) Old 11-26-2016, 11:14 PM
Senior Member
 
Join Date: Feb 2009
Location: Winnipeg MB Canada
Posts: 300
 
I'd look around that plastic restrictor tee.
JackFish is offline  
post #7 of 23 (permalink) Old 11-27-2016, 06:47 AM
Senior Member
 
Fred Kiehl's Avatar
 
Join Date: Feb 2009
Location: Largo, FL 33774
Posts: 9,955
 
I had a leak that would pool on the intake manifold. The liquid never got to the ground, because it would evaporate before it made a big enough pool to overflow onto the ground.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check http://www.impalassforum.com/vBullet...ion-parts.html
Fred Kiehl is offline  
post #8 of 23 (permalink) Old 11-27-2016, 07:50 AM
Senior Member
 
Join Date: Jan 2001
Location: St. Louis
Posts: 6,337
 
Good one. In my case it was a microscopic pinhole in the radiator hose. It never overheated, never a leak, but the fill tank would empty every 6 months. This went a couple of years, then I happened to pop the hood while running to check a squeak or something right after a run and noticed the teeny stream for only 10 seconds and vaporizing right onto a little green "mossy" looking spot on the block.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, SLP SS, 3000 Edge, F/HO bars, METCO extendeds and CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: SS Bars, METCO LCAs, Koni Reds, PowerTrax No-Slip
96 Black is offline  
post #9 of 23 (permalink) Old 11-27-2016, 12:32 PM
HUF
Senior Member
 
HUF's Avatar
 
Join Date: Aug 2009
Location: Western Massachusetts
Posts: 967
 
Quote:
Originally Posted by 96 Black View Post
Good one. In my case it was a microscopic pinhole in the radiator hose. It never overheated, never a leak, but the fill tank would empty every 6 months. This went a couple of years, then I happened to pop the hood while running to check a squeak or something right after a run and noticed the teeny stream for only 10 seconds and vaporizing right onto a little green "mossy" looking spot on the block.
Visual inspection will be even more helpful if you increase RPMs to some 2000 by lifting up the throttle lever (next to the throttle body) by hand.

There’s nothing as permanent as a temporary solution.

1995 Cadillac Fleetwood Brougham 118,XXX miles.
HUF is offline  
post #10 of 23 (permalink) Old 11-27-2016, 02:31 PM Thread Starter
Senior Member
 
Join Date: Aug 2001
Location: ny
Posts: 660
 
I was just under the car. Radiator / radiator supports are bone dry. No stains, no drip marks..... Nothing.

What was weird, I ran the car for 1/2 hr, with the radiator cap off. I stepped away for 1 minute, when I got back, antifreeze was gushing over the top of the coolant tank. I've never seen this happen, but I'm not familiar with the reverse flow systems. I'm an old timer from the standard flow SBC's...

Is it normal for the tanks to over flow with the cap off ?

94 + 95 + 96 = 3
the blur is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy Impala SS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome