Evasive Coolant Leak - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 02-02-2015, 04:02 AM Thread Starter
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Evasive Coolant Leak

When I leave truck outside in cold weather, there is USUALLY a small puddle of coolant underneath it in the morning. It seems not to leak in warmer weather. My diesel guy pressurized system and cannot find the leak. I have looked everywhere and cannot find leak. Over last couple of months or so I have added about 3 gals of coolant. I usually smell the coolant burning off when I drive it.

Any ideas on how to find this leak?

Thanks

2004 F350 Lariat, Ext Cab
SRW, 6.0 TD, LOADED Shorty
SCT SF3
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MBRP Turbo Back 409
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OilGuard Bypass Filter
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post #2 of 13 (permalink) Old 02-02-2015, 01:43 PM
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That sounds like the typical leak of the hose between the oil cooler and the EGR cooler. It's a few inches long and can replaced expensively following the service manual for those not experienced with the 6.0L, or cheaply by following the internet / experienced mechanic procedure of removing the air charge piping, then unbolting the cap on the oil cooler to replace the hose. Removing the cap also requires the cap's O-ring being replaced.

If you park the truck with the front uphill you can usually see the leak on the driveway to the back of the motor. Even getting up over the motor it can be a difficult leak to see unless you are able to stuff a paper towel under the hose when it's first parked and hot. I you are still using the G-05 coolant there can be a residual white residue left behind.

Jack -
Formerly FMTRVT, Manager of Vehicle Testing - Brakes

2003 F-350SC Lariat 4x4 6.0L Auto

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Step Lights;Painted Flanges; Bypass Oil Filter; Heated Mirror Switch; Reverse Lights; 7.3L Fuel Reg Shim; 6 Disc Radio Speed Volume Mod; Coolant Filter, etc.

Last edited by TooManyToys; 02-02-2015 at 01:48 PM.
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post #3 of 13 (permalink) Old 02-02-2015, 08:03 PM Thread Starter
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TooMany.....,

Thanks for your response. I had an EGR Delete done. I think you might be referring to the short blue hose that USED to be there. Is that correct? I don't quite understand the EGR Cooler system, but I think my cooler was removed and a hose was put in its place. Does that make sense? Maybe that hose could be leaking, but I have looked at it from the top of the engine and have seen no signs of leaking. I flushed the factory coolant years ago and am running Ext Life Cat-1.

Regardless, I have parked the truck "uphill" in my driveway (again) to see if I can locate the leak tomorrow morning. I am not very optimistic though.

My greatest fear is that the leak might be coming from the head gasket. Could that be a possibility? The truck runs fine. I just drove 200 miles today and got 21.5 MPG at 70-75 MPH.

Thanks much!

2004 F350 Lariat, Ext Cab
SRW, 6.0 TD, LOADED Shorty
SCT SF3
Autometer Fuel Pressure
MBRP Turbo Back 409
DieselSite Coolant Filter
OilGuard Bypass Filter
Fumoto Drain Valve
HFCM Water Separator Drain Plug
50 gal TransferFlow
Sliding Cargo Bed
ScanGauge II
Front Receiver
Warn 8000 lb Winch (Draw Bar Mount)
WeatherGuard Lo-Siders
MacNeil Floor Liners
Galaxy DX95T 10 Meter w/ CB Mod
Wilson 5000 Antenna
Kimber SS .45 cal UltraCarry w/ LaserMax!
Frame Mounted Safe
Empty Weight with 80 Gal Fuel 8400 lbs
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post #4 of 13 (permalink) Old 02-02-2015, 08:23 PM
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Yep, that was the hose I was referring to. I didn't realize you had a delete, but the deletes I'm familiar with still use a hose between the cooler and the retune port plumbing so that hose or the O-Ring that is there could still be a source for the leak. With the Cat coolant you will not get a white residue but a white paper towel stuck down there would still show a leak with the Cat coolant staining.

Head gasket ...... Right now I don't want to think about head gaskets......

Jack -
Formerly FMTRVT, Manager of Vehicle Testing - Brakes

2003 F-350SC Lariat 4x4 6.0L Auto

Truck Modifications as below in Pictorials on Facebook. Google - Facebook TooManyToys
Step Lights;Painted Flanges; Bypass Oil Filter; Heated Mirror Switch; Reverse Lights; 7.3L Fuel Reg Shim; 6 Disc Radio Speed Volume Mod; Coolant Filter, etc.
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post #5 of 13 (permalink) Old 02-03-2015, 01:51 AM
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After my delete a hose clamp was loose and leaking. I found it in the valley up under there. I think it's what TMT is referring to. Anyway you may want to check those clamps to make sure they're tight and/or secure.

2005 F-250 short bed Superduty
6.0 blue spring
3.5" straight piped
minus EGR
Edge CTS
More oomph by Vivian
And a Sinister coolant filter
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post #6 of 13 (permalink) Old 02-03-2015, 05:05 AM
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I found my shut off valves for my coolant filter leaked a little after getting it warm while driving with my snow plow on. Rotated valves a couple of times and they seem to be OK now. Small drip was virtually undetectable.

Early 2004 F-250 4x4 CC 6.0


2nd owner, ARP studs 1 at a time, Some parts missing in the exhaust path, BD intercooler hoses, Blue spring, MC filters, Sinister coolant filter, Exhaust manifold gaskets, WARN lockouts, Gold coolant, zoodad mod, autometer boost gauge, high idle mod, Scangauge 2, SCT X3 tuned from KEM, autometer fuel pressure gauge, Archoil 6200 in the fuel, FICM by Ed w/ATLAS40, autometer pyro gauge,'08 Alum Rear Diff cover, 5w-40 Rotella T6 w/ Archoil 9100 in it, zert in the slip joint, harpooned fuel tank, 6.4 banjos


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post #7 of 13 (permalink) Old 02-03-2015, 10:24 PM Thread Starter
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Well, as Murphy would have it, it was in the 20s last night and there was no leaking. I put paper towels under the EGR delete hose, and there was no staining.

I am really baffled and am still worried about this being a symptom of a really serious problem......like head gasket leaking or whatever. Any thoughts?

Thanks much!

2004 F350 Lariat, Ext Cab
SRW, 6.0 TD, LOADED Shorty
SCT SF3
Autometer Fuel Pressure
MBRP Turbo Back 409
DieselSite Coolant Filter
OilGuard Bypass Filter
Fumoto Drain Valve
HFCM Water Separator Drain Plug
50 gal TransferFlow
Sliding Cargo Bed
ScanGauge II
Front Receiver
Warn 8000 lb Winch (Draw Bar Mount)
WeatherGuard Lo-Siders
MacNeil Floor Liners
Galaxy DX95T 10 Meter w/ CB Mod
Wilson 5000 Antenna
Kimber SS .45 cal UltraCarry w/ LaserMax!
Frame Mounted Safe
Empty Weight with 80 Gal Fuel 8400 lbs
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post #8 of 13 (permalink) Old 02-03-2015, 10:35 PM
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They make test strips that will show the presents of combustion gasses in the coolant. This will confirm a leaky head gasket.

Dave

2004 Ford F-350 Regular cab with 6.0.
Completely Stock.

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post #9 of 13 (permalink) Old 02-04-2015, 12:18 AM
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Dave, I have not seen test strips for combustion, but if they are available that would be great. The only ones I know of are for the ph level and SCA's of the coolant.

The only combustion gas tester I know of are the liquid type that you suck up some degas tank air into and the fluid turns from blue to yellow if combustion gasses are present. Another way is to use an exhaust gas analyzer sniffer probe and stick it in the degas tank above the coolant level and draw in the air-fumes. These methods are not always entirely accurate, especially if the combustion gasses have already escaped or are not being generated at the time of the testing.


Harry

Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
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post #10 of 13 (permalink) Old 02-04-2015, 12:51 AM
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I am sorry Harry, you are correct.

Dave

2004 Ford F-350 Regular cab with 6.0.
Completely Stock.

KK6TNI - HAM Radio

http://bennettlaneshopping.com/ - Our Outdoor/Garden and Kitchen Ware store
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