Blowing coolant out reservoir. No coolant in oil.

jb138411 · 08-25-2008, 04:14 PM

I'm blowing coolant out of my '96 12v at the coolant reservoir at idle without truck even warming up. Loses coolant even when cranking without full start up. Not finding any coolant in the motor oil, nor is there any oil coming through into my coolant. Truck runs fine, does not seem to miss. Thought it was head gasket at first but now am not so sure. PLEASE HELP!!

renopker · 08-26-2008, 09:21 AM

its a head gasket your blowing comp in to the coolent.

__________________
98 12v,2wd twins,3:55,g56 6speed,elec fan clutch,100 hp sticks, 10 plate FF aFC fB,3gsk Valair ats,fluid damper,60#springs,o6 exhaust brake,High Idle,prime loc, 4"exh,piller mount

clc · 08-26-2008, 09:48 AM

Sounds like the head gasket to me. I'd check the head for flatness and cracks while I had it off.

Fill out your signature so we will know more about your truck and any modifications. That will help us help you in the future.

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96 3500 4WD, 47RE, gauges; 97 3500 4WD 47RE, gauges; 97 3500 2WD 5-spd; all club cab. 98.5 2500 2WD SB, 5-spd, gauges, quad cab

DORKWEED · 08-26-2008, 01:57 PM

with the above posts!!

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jb138411 · 08-27-2008, 04:41 PM

Thank y'all very much. The help is appreciated.

bart9505 · 08-27-2008, 05:06 PM

my '97 did that after the jokers at the dealer replaced the short block and left the radiator cap loose. I didn't think to check for that, or the vacuum lines left disconnected, and drove it for a couple weeks in the summer, towing and everything. Luckly, the 5.9 is a tough motor, and does not overheat easily, even when the coolant system is not pressurized. The cap was partway on, so it would build a little pressure, but let the coolant out to the reservoir bottle, and then leak air when it cooled, instead of pulling the coolant back in the motor. After a few cycles, the reservoir was full and the top of the radiator core was visible. I just put the fluid levels back to the right places and made sure the cap was back on right, and never had it happen again. you might have a bad cap or an air leak on the hose to the reservoir.

__________________
New: 2008 black MegaCab, 6.7, 4x4, auto, stnd gears, no mods, only 9k miles so far
Old: 1997 extended 5.9, 4x4, 5sp, 150k miles, mostly stock but added edelbrock shocks

arcoen · 08-27-2008, 06:51 PM

Do a pressure check on the cooling system- but it sounds like a head gasket- other then popular misconception - 9 time out of ten- coolant doesnt make it to the oil when compression gasses over pressurizes the water syatem- lifts the cap- and blows coolant out into the overflow tank until final loss of water causes a sparatic overheat on your gauge.

__________________
2001 extended cab, full bed 2500 4x4 superchiped, 160,000 miles , Running home brewed bio for 7 months- Hauling butt, smelling like french fries- Navy Cummins tech for 15 years

totalloser · 08-30-2008, 11:07 PM

+1, but I would try a new radiator cap first. If it is really bad, the water pump could push coolant out. If it isn't losing much at low temp, this could be the problem, and is cheap and easy to try. So is a pressure check. Look for a crack in the radiator neck, too. I would do these first JUST IN CASE.

__________________
01 24v 100hp tips, 4"ss BDbrake &steering brace PSCpump 1.5"dom steering tapped box 1.5"ram manual CAD switch dual carters 3.55's LSD, big shaft nv5600/241HD 6 35's inners pulled in (no spacer) Ugly black and thrashed!

08-25-2008, 04:14 PM	#1 (permalink)
jb138411 Newbie Join Date: Aug 2008 Location: Midland, TX Posts: 2 jb138411's Truck Pics	Blowing coolant out reservoir. No coolant in oil. I'm blowing coolant out of my '96 12v at the coolant reservoir at idle without truck even warming up. Loses coolant even when cranking without full start up. Not finding any coolant in the motor oil, nor is there any oil coming through into my coolant. Truck runs fine, does not seem to miss. Thought it was head gasket at first but now am not so sure. PLEASE HELP!!

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08-26-2008, 09:21 AM	#2 (permalink)
renopker Cummins Enthusiast Join Date: Aug 2007 Posts: 200 renopker's Truck Pics	its a head gasket your blowing comp in to the coolent. __________________ 98 12v,2wd twins,3:55,g56 6speed,elec fan clutch,100 hp sticks, 10 plate FF aFC fB,3gsk Valair ats,fluid damper,60#springs,o6 exhaust brake,High Idle,prime loc, 4"exh,piller mount

08-26-2008, 09:48 AM	#3 (permalink)
clc Cummins Enthusiast Join Date: Feb 2008 Posts: 255 clc's Truck Pics	Sounds like the head gasket to me. I'd check the head for flatness and cracks while I had it off. Fill out your signature so we will know more about your truck and any modifications. That will help us help you in the future. __________________ 96 3500 4WD, 47RE, gauges; 97 3500 4WD 47RE, gauges; 97 3500 2WD 5-spd; all club cab. 98.5 2500 2WD SB, 5-spd, gauges, quad cab

08-26-2008, 01:57 PM	#4 (permalink)
DORKWEED Diesel Head Join Date: Dec 2005 Location: "The Peoples Republic of Illinois".....behind enemy lines Posts: 1,870 DORKWEED's Truck Pics	with the above posts!! __________________ NRA LIFE MEMBER

08-27-2008, 04:41 PM	#5 (permalink)
jb138411 Newbie Join Date: Aug 2008 Location: Midland, TX Posts: 2 jb138411's Truck Pics	Thank y'all very much. The help is appreciated.

08-27-2008, 05:06 PM	#6 (permalink)
bart9505 Cummins Fan Join Date: Oct 2007 Location: Tacoma Posts: 94 bart9505's Truck Pics	my '97 did that after the jokers at the dealer replaced the short block and left the radiator cap loose. I didn't think to check for that, or the vacuum lines left disconnected, and drove it for a couple weeks in the summer, towing and everything. Luckly, the 5.9 is a tough motor, and does not overheat easily, even when the coolant system is not pressurized. The cap was partway on, so it would build a little pressure, but let the coolant out to the reservoir bottle, and then leak air when it cooled, instead of pulling the coolant back in the motor. After a few cycles, the reservoir was full and the top of the radiator core was visible. I just put the fluid levels back to the right places and made sure the cap was back on right, and never had it happen again. you might have a bad cap or an air leak on the hose to the reservoir. __________________ New: 2008 black MegaCab, 6.7, 4x4, auto, stnd gears, no mods, only 9k miles so far Old: 1997 extended 5.9, 4x4, 5sp, 150k miles, mostly stock but added edelbrock shocks

08-27-2008, 06:51 PM	#7 (permalink)
arcoen Cummins Fan Join Date: Jan 2008 Posts: 54 arcoen's Truck Pics	Do a pressure check on the cooling system- but it sounds like a head gasket- other then popular misconception - 9 time out of ten- coolant doesnt make it to the oil when compression gasses over pressurizes the water syatem- lifts the cap- and blows coolant out into the overflow tank until final loss of water causes a sparatic overheat on your gauge. __________________ 2001 extended cab, full bed 2500 4x4 superchiped, 160,000 miles , Running home brewed bio for 7 months- Hauling butt, smelling like french fries- Navy Cummins tech for 15 years

08-30-2008, 11:07 PM	#8 (permalink)
totalloser Diesel Freak Join Date: Oct 2007 Posts: 720 totalloser's Truck Pics	+1, but I would try a new radiator cap first. If it is really bad, the water pump could push coolant out. If it isn't losing much at low temp, this could be the problem, and is cheap and easy to try. So is a pressure check. Look for a crack in the radiator neck, too. I would do these first JUST IN CASE. __________________ 01 24v 100hp tips, 4"ss BDbrake &steering brace PSCpump 1.5"dom steering tapped box 1.5"ram manual CAD switch dual carters 3.55's LSD, big shaft nv5600/241HD 6 35's inners pulled in (no spacer) Ugly black and thrashed!