Recent Topics
1994 Buick Century 63k miles pics
by MuzzleFlash40 - 02/26/20 04:10 AM
Oils for old engines
by puma4440 - 02/25/20 08:18 PM
Do you still use liquid and paste sealants
by WhyMe - 02/25/20 08:16 PM
VW dealer hilarity - window tinted the wrong car.
by pezzy669 - 02/25/20 07:53 PM
New style Goodyear Duratrac
by NHRATA - 02/25/20 07:44 PM
Need oil additive advise for replacement engine.
by 13Track38 - 02/25/20 07:18 PM
New member with UOA to share
by JamesGames - 02/25/20 07:10 PM
When do you do DIY?
by BMWTurboDzl - 02/25/20 06:47 PM
synchromesh
by hunter29 - 02/25/20 06:41 PM
Ever buy a stranger lunch ?
by Mr Nice - 02/25/20 06:18 PM
36 bucks for balancing two tires....
by Vern_in_IL - 02/25/20 05:20 PM
project farm like test for Maxlife vs toyota WS
by danez_yoda - 02/25/20 05:09 PM
Audi Q5 Transmission oil?
by John344 - 02/25/20 04:35 PM
Valvoline Modern engine
by Villalobos - 02/25/20 04:35 PM
Rust bubbles
by WA1DH - 02/25/20 04:27 PM
Which of these sub $4 filters
by jayjr1105 - 02/25/20 04:05 PM
Flaring tool
by P10crew - 02/25/20 01:52 PM
Hazet 600LG/8 Wrench set - $160
by drtyler - 02/25/20 01:34 PM
Newest Members
akarip, BJD2020, ToyTaco2002, EarlT500, Newbie111
70801 Registered Users
Who's Online Now
23 registered members (53' Stude, Aichiguy, Amenhotep, Brian553, Bjornviken, 5 invisible), 1,161 guests, and 20 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics301,933
Posts5,205,755
Members70,801
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
Page 1 of 2 1 2
Can't purge coolant, radiator slowly overflows even when thermostat is closed. #5346630 02/10/20 07:36 PM
Joined: Jun 2012
Posts: 1,005
D
DemoFly Offline OP
OP Offline
D
Joined: Jun 2012
Posts: 1,005
1996 Jeep Grand Cherokee 5.2L V8 (Magnum 318) Stock everything.

I have a gurgle in the heater core on startup, I didn't use to so something changed.

Bleeding proceedure:

RADIATOR CAP = OFF
HEATER SET = HIGH
BLOWER FAN = HIGH

Let idle at varying speeds until engine reaches 195F and the thermostat opens.

The problem:

Even from a cold start the radiator level will slowly rise and start pouring out the radiator fill neck at a rate of ~4fl. oz. per minute. Attempting to bleed the coolant system results in a net loss of coolant in the system even after the thermostat has cycled several times.

I did the exhaust gas in coolant test with the blue reactive fluid and it passed. Is the next step buying a leak down tester?


Pushrods, please.
Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: DemoFly] #5346650 02/10/20 08:00 PM
Joined: Dec 2005
Posts: 110
J
JohnG Offline
Offline
J
Joined: Dec 2005
Posts: 110
Some vehicles take something like 3000 rpm to bleed air properly. The coolant overflow is probably just from thermal expansion of the cold coolant. Don't let the car warm up too much with the cap off. Try to rev the engine with the coolant still cold, or cool. If that fails, make sure that if there is a small bleeder hose running into the reservoir, that it is open and CONSTANTLY flowing coolant, hot or cold.

Other than that, try to run it normally, getting the revs up.

Most cars that I've seen recently have a high point hose that serves that purpose, just to keep air always being directed to the reservoir. They can become plugged with sludge or bits of rubber, sometimes even the steel fittings will corrode inside, reducing the flow to almost nothing. If you find one, and it is plugged, do not blow the debris back into the engine. Remove the fitting and clean it out off of the car, otherwise your problem will return soon.

Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: DemoFly] #5346663 02/10/20 08:11 PM
Joined: Jul 2013
Posts: 1,408
S
splinter Offline
Offline
S
Joined: Jul 2013
Posts: 1,408
I've had good luck using a funnel to aid the process of bleeding and purging cooling circuits.

https://www.amazon.com/Lisle-24680-...&hvtargid=pla-436789109021&psc=1


PUP 0W-40
Total Quartz 5W-40
M1 5W-50

Past performance is no guarantee of future results.
Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: DemoFly] #5346669 02/10/20 08:19 PM
Joined: Apr 2010
Posts: 4,022
A
atikovi Offline
Offline
A
Joined: Apr 2010
Posts: 4,022
Get a vacuum bleeder or you'll never get all the trapped air out.

[Linked Image from tooltopia.com]

Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: DemoFly] #5346675 02/10/20 08:24 PM
Joined: Sep 2015
Posts: 2,437
M
mk378 Offline
Offline
M
Joined: Sep 2015
Posts: 2,437
Without symptoms like overheating or no heat, no need to do anything drastic yet. Before starting for the first trip every day, when the engine is completely cold check the radiator. If its not full to the top, fill it up. Then put the cap on, start up and drive. Do this several days. If you find coolant keeps moving to the expansion tank and not returning it could be a bad head gasket or a problem with the radiator cap or the hose between the radiator and the tank.

Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: mk378] #5346682 02/10/20 08:35 PM
Joined: Oct 2010
Posts: 1,222
M
mattd Offline
Offline
M
Joined: Oct 2010
Posts: 1,222
FWIW those “block” testers are completely useless IME.

Have you tested your cap?

Last edited by mattd; 02/10/20 08:35 PM.

2007 Ford F-350 4x4 6.0 PSD

ASE Master, L1, L2
Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: DemoFly] #5346684 02/10/20 08:37 PM
Joined: Oct 2002
Posts: 572
C
Cressida Offline
Offline
C
Joined: Oct 2002
Posts: 572
In addition to the other good ideas given, consider driving it for a week and determine if you are using or loosing any coolant .

Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: DemoFly] #5346696 02/10/20 08:46 PM
Joined: Apr 2018
Posts: 1,604
I
Imp4 Offline
Offline
I
Joined: Apr 2018
Posts: 1,604
The Lisle type funnels work great and knockoffs can be had for about $20.
In order to use the vacuum bleeder, you need compressed shop air, which might not be available to us shade tree types.


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: Imp4] #5346699 02/10/20 08:50 PM
Joined: Apr 2010
Posts: 4,022
A
atikovi Offline
Offline
A
Joined: Apr 2010
Posts: 4,022
Originally Posted by Imp4
The Lisle type funnels work great and knockoffs can be had for about $20.
In order to use the vacuum bleeder, you need compressed shop air, which might not be available to us shade tree types.


Just how do those funnel things get trapped air pockets out?

Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: mattd] #5346701 02/10/20 08:52 PM
Joined: Nov 2006
Posts: 22,997
T
Trav Offline
Offline
T
Joined: Nov 2006
Posts: 22,997
Originally Posted by mattd
FWIW those “block” testers are completely useless IME.

Have you tested your cap?


I have to disagree with that. I used one on an engine with a very minor crack in the head next to the intake valve and it turned the fluid yellow in seconds.
The fluid does react quickly to hydrocarbons, granted it will not detect a internal leak into the oil or an external one but that does not render the tool "useless".
I think of it as just another testing tool in the arsenal.


ASE L1, Master. Deutsch Meisterbrief.
Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: DemoFly] #5346748 02/10/20 10:29 PM
Joined: Jun 2012
Posts: 1,005
D
DemoFly Offline OP
OP Offline
D
Joined: Jun 2012
Posts: 1,005
I went out and bought the lisle spill free funnel and gave it another go.

The level kept rising in the funnel up until it almost started overflowing and then the thermostat opened and the engine took a big gulp and sucked back about 2 quarts. I never actually saw any air bubbles, but once the engine sucked back that coolant the level never rose again. I put the radiator cap back on, we'll see how it goes.

Makes sense that this method would work better because if not for the funnel holding all that fluid, my old method would have puked all that coolant into my drain container.

Still, however, after my 3 or so bleed attempts I have not added any coolant haha. Only net losses.

Radiator cap is new and tested, expansion reservoir hose has been checked for blockages, system holds 18lbs of pressure, no overheating issues and I have good but not stellar heat.

Last edited by DemoFly; 02/10/20 10:32 PM.

Pushrods, please.
Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: atikovi] #5346840 02/11/20 04:58 AM
Joined: Jul 2005
Posts: 33,988
D
demarpaint Offline
Offline
D
Joined: Jul 2005
Posts: 33,988
Originally Posted by atikovi
Get a vacuum bleeder or you'll never get all the trapped air out.

[Linked Image from tooltopia.com]

That tool is worth its weight in gold.


God Bless Our Troops

Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: Trav] #5346856 02/11/20 05:47 AM
Joined: Oct 2010
Posts: 1,222
M
mattd Offline
Offline
M
Joined: Oct 2010
Posts: 1,222
Originally Posted by Trav
Originally Posted by mattd
FWIW those “block” testers are completely useless IME.

Have you tested your cap?


I have to disagree with that. I used one on an engine with a very minor crack in the head next to the intake valve and it turned the fluid yellow in seconds.
The fluid does react quickly to hydrocarbons, granted it will not detect a internal leak into the oil or an external one but that does not render the tool "useless".
I think of it as just another testing tool in the arsenal.


I have had several engines with badly blown head gaskets and it has never changed color. I can probably say it worked on 1 vehicle that coolant was boiling out of the reservoir. I find the best tool for this is a 5 gas analyzer. Heck I have even stuck the tester near a tail pipe of a running car (for testing purposes) and was reluctant to change color. Again, just my experience with this particular tool.

Last edited by mattd; 02/11/20 05:49 AM.

2007 Ford F-350 4x4 6.0 PSD

ASE Master, L1, L2
Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: atikovi] #5346884 02/11/20 06:35 AM
Joined: Apr 2018
Posts: 1,604
I
Imp4 Offline
Offline
I
Joined: Apr 2018
Posts: 1,604
Originally Posted by atikovi
Originally Posted by Imp4
The Lisle type funnels work great and knockoffs can be had for about $20.
In order to use the vacuum bleeder, you need compressed shop air, which might not be available to us shade tree types.


Just how do those funnel things get trapped air pockets out?

Hey, thanks for the snide comment...

Upon reflection, I guess it's the exact same way as a vacuum bleeder does when you're like me and you don't have a compressor. And the answer there is that neither works in those circumstances.

Put another way, the Lisle funnel doesn't get trapped air pockets out and a vacuum bleeder with no compressor doesn't get trapped air pockets out either.

Now, a shade tree type like me is never going to buy a compressor, so a Lisle funnel, while a flawed solution in the circumstances you describe, is much better in the preponderance of situations than the multiple thermal cycle method and much faster too.

And it's only $22....

Cheers!!!
cheers


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: Can't purge coolant, radiator slowly overflows even when thermostat is closed. [Re: DemoFly] #5346893 02/11/20 06:48 AM
Joined: Apr 2010
Posts: 4,022
A
atikovi Offline
Offline
A
Joined: Apr 2010
Posts: 4,022
HAHA! $22 for something that doesn't fix your problem is a bargain. banana

Page 1 of 2 1 2
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™