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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!!
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 performance mods, only 18k miles so far
Old: 1997 extended 5.9, 4x4, 5sp, 150k miles, mostly stock but added edelbrock shocks
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
+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 100hp tips EZ *hybrid* 4"ss BDbrake &steering brace "t"steer delphi tapped &rammed manual CAD 3.55's LSD, 1.375 nv5600/241HD Valair single pc rear ds 265x70r19.5 big rigs 3rd gen brakes Ugly black and thrashed!
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