Any word on what you found yet???

 

I'm having the same issue, seems worse when i keep the truck plugged in, gonna get a new cap. Keep us posted on what you find out

 

Still haven't had time to look at it much. I'm in a carpool and only drive it one week every other week. Next week I'll be driving and should be looking back into it.

 

Same here, just post up when you figure somethin out, If I hit on anything I'll let ya Know

 

I am having the same prob. but when I adjust my temp inside the truck I can smell anti-freez for a little bit, if I have it al the way cold it does not do it or when the temp is all the way to hot. It only happens about the middle, so I am thinking my heater core is going out?? Is this a problem any one else has had? Oh ya mine is very slow it go down in the over flow bottle from full it might take 6 months or more to go half way down.

 

one thing that is cheap to do is replace the hose going from the radiator to the overflow bottle. it can be cracked or have a pinhole in it. whe it's cold it won't leak but as you drive it the rubber expands and will weap water out since it's not a pressure hose and then close back up once it cools down. you'll spend no more than 2-3 bux on this. also i'd bite the bullet and put a new cap on while you are at it. 7016 is 3.99 and 7716 (w/the pressure relief tab) is 5.99 from Autozone. and the hose can't be more than 99cents a foot.

 

Thats like $6.00!!! Man are you high or something? I'm just not sure that I'm willing to make that kind of commitment. What if it doesn't work? I'm not sure I can gamble that kind of money.

j/k dude I'm prob attempting humor b/c I just paid $103 for fuel and want to cry. When I bought my first dodge Cummins diesel back in 02, I was paying $50 to fill the tank...

Alas.. back to the matter at hand.... That's actually a really good suggestion. I was already on the bandwagon to replace the rad cap as Uncle Bub had suggested. But the line to the overflow is a good suggestion too. Didn't think of that... or anything else you guys pointed out. It's nice to have smart and helpful friends.

 

There is a UV dye you can add to the coolant... Then use a UV light and check over the system. The UV Dye shows up rather brightly in the UV light. Then you can check all external areas of the truck...

 

I changed the thermostat as Queeg suggested and it has seem to cure the problem, I can't explain how it stopped it with a sealed system cap not lifting and pressure tested the cap and the whole coolant system, let it set for 2 hours with 15# on it and it held solid. Don't have a clue where the coolant was going.Guys thanks for the help, just kills me when I can't explain how or why.

 

Is this on the 99? Could it be the infamous 53 block?