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Technical Info: 2nd Gen NON-DRIVETRAIN Technical discussion of second generation (1994 - 2002) questions, solutions and upgrades. Please -- DO NOT post drivetrain discussions in this forum.
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  #1  
Old 12-16-2016
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smokediver smokediver is offline
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Default sounds like running water in the dash...

When the truck starts rolling it sounds like a river running under the dash somewhere. Seems to be more toward the passengers side, or toward the middle from the pass side.
No water in the floor, no leaks that I've found.
Last time I used the A/C, maybe a month ago it was dripping underneath so I don't think it's the A/C drain but I'll check it when I get time to get under there.
The water sound has been there longer than that.

No antifreeze smell from the heater and no fog from the defrost.

The radiator level did start dropping a little last week.
Added about a gallon since then, but less than a quart most mornings.
No drips under the truck. Looked several times after it sat for 30-60 minutes while I sat a building.
Ground all dry.
Need to make sure my overflow jug didn't freeze and crack...

Any ideas?
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'07, megacab, 2WD, Dually, 6.7, auto,
Deleted, h&s programmer, jasper turbo, ETE tranny, 400k mi !!
'09, quad cab, Laramie, 2WD, Dually, 6.7, auto. 255k mi
Stock, until...
My Other Truck is a Fire Engine!!
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  #2  
Old 12-16-2016
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cougar cougar is offline
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Make sure the antifreeze isn't leaking into your block or getting into the transmission via the heat exchanger. Look behind your turbo at the block for that crack. You can remover the hearer blower motor and stick you hand in the plenum to check for water and clean out any debris. Check the area under the cowl were the heater air intake is, you could have a pool there. Just ideas.
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92 W250 Xcab 4X4, HD 47RH with Compushift, Scheid Lightning VE, GDS moded H1C/w 16cm, 7X010 DAP injectors, the usual gauges.
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  #3  
Old 12-17-2016
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Nothing in the engine or tranny.
All dry inside the fan housing as far as I can reach in all directions, to the evaporator and to the air intake under the cowl
Found 2 leaves inside the squirrel cage....maybe....doubt I.

Topped off and let run for 30 minutes, not a drop anywhere under the hood...not on the block, water pump weep hole, hoses.
Filled the overflow canister and it's still full.
Engine temp hasn't been over 190 since the new radiator and fan clutch were installed.
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'07, megacab, 2WD, Dually, 6.7, auto,
Deleted, h&s programmer, jasper turbo, ETE tranny, 400k mi !!
'09, quad cab, Laramie, 2WD, Dually, 6.7, auto. 255k mi
Stock, until...
My Other Truck is a Fire Engine!!
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  #4  
Old 12-17-2016
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PIGIRON PIGIRON is offline
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My wifes GMG had a similar problem a few years ago, I was adding coolant every two weeks, then it got worse, I was adding every two days. No leaks, no wet marks anywhere, but you could always smell coolant a bit when you walked past the truck. She took it to the dealer and pressure tested the cooling system and said the waterpump was shot, apparently the coolant shot out of the pump when under pressure, it wouldn't do it idling, just at hi-way speeds. Replaced the water pump, and doesn't lose a drop now.
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1991.5 W250, "SOLD"...17 Years of plowing, pulling skidsteers, ran like a champ, 430,000kms, same transmission (A518).

2008 Dodge Ram 3500 Heavy Duty, SLT Quad Cab, Bilstiens, levelling kit, BD Steering Box Stabilizer Bar, BD heavy duty swaybar links, BD double deep tranny pan, Edge moniter, otherwise completely stock.(for now)
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  #5  
Old 12-19-2016
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smokediver smokediver is offline
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Well, it's possible I suppose. The water pump is new...X2.
The first "new" one lasted about a month and blew on me in Greenville, 150 miles from home. Fortunately it's an easy swap!!
That's been 3 months ago.
I never smell coolant, inside or out, anywhere!
Now, despite a new thermostat the engine is never really warm unless it's pulling.
It may stay 140-150 after 20 miles, but only hits 180 under load.
So it is possible it only leaks at temp and only under way.

I am familiar with pressure testing.
I think Dad still has the pressure pump.
We use to do radiator repair. Use to be the only one in town!!

Last time I was beginning to suspect a head gasket or something similar, but after Everything was replaced it's been 100% tight for 10,000 miles, so something has happened.
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'07, megacab, 2WD, Dually, 6.7, auto,
Deleted, h&s programmer, jasper turbo, ETE tranny, 400k mi !!
'09, quad cab, Laramie, 2WD, Dually, 6.7, auto. 255k mi
Stock, until...
My Other Truck is a Fire Engine!!
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  #6  
Old 12-19-2016
dieselfarmboy dieselfarmboy is offline
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What about the oil to water heat exchanger?
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  #7  
Old 12-20-2016
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just my SWAG but sounds to me like an air bubble in the heater core ... and the low coolant could have come from a big bubble working itself out of the system. The only way I can think of to get a running water sound is if there's air in the core.
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07 2500 4x4 Laramie 6 speed.

SOLD 97 2500 4x4 ExtCab LB Auto; Isspro gauges (pyro, boost, tranny); 75hp Maxsticks, MaxTrans auto, KDP killed; BD DSS; 3rd gen 17" wheels; GM 1ton rear brake cylinders; Westin step bars; Pakbrake exhaust brake, TS Performance TC Lockup.
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  #8  
Old 12-20-2016
Junkman Junkman is offline
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Parts stores rent pressure testers. Harbor Freight has s decent set that goes on sale frequently. I'm trying to buy tools that I never could/would afford so I don't have to run to the store and find that they're out.
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  #9  
Old 01-06-2017
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smokediver smokediver is offline
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Found a leak...
Right front of cylinder head, just below thermostat housing.
Looks like the head gasket but guess I won't know for sure till I pull it.

A little search and read suggests this is rather common, usually just gasket failure....?
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File Type: jpg 20170105_143356_resized.jpg (77.4 KB, 15 views)
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'07, megacab, 2WD, Dually, 6.7, auto,
Deleted, h&s programmer, jasper turbo, ETE tranny, 400k mi !!
'09, quad cab, Laramie, 2WD, Dually, 6.7, auto. 255k mi
Stock, until...
My Other Truck is a Fire Engine!!

Last edited by smokediver; 01-06-2017 at 07:47 AM..
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  #10  
Old 01-08-2017
RAF RAF is offline
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The B engines normally leak at the right front, sometimes the right rear. Still would pressure test it that it's not the t'stat housing & running down.
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