ok , i have a 1999 dodge ram magnum V6 and since i have it (about 1 1/2 years) i have noticed that i refill it with coolant, after a couple drives, it disappers leaving only a small very small amount in the tank. and the wierd thing is that it didnt seam to cause any problems, until now. the tempeture suddenly rises and i have to turn the truck off so it can cool and it cools right away. it doesnt look like it leaks because i have never seen any puddles under or anywhere on the truck nor inside the hood. i have checked the oil an it doesnt seem to be contaminated with coolant. also i dont smell the coolant also. where is the coolant going???

 

How many times have you filled it? Could just be really low on coolant...

 

since i have it i have been filling like every 3-4 months

 

Is there a split in the heater return line that runs along the valve cover? I had a leak there that dropped on the exhaust manifold and evaporated before it ever got a chance to pool.

Also check to make sure you don't have any dripping coming from the heater core feed and return lines. That usually indicates the heater core has some pinhole leaks.

Other likely spots: both hose connections to the radiator, the thermostat housing, the bypass hose, freeze plugs on the bottom of the block.

 

there is something on hose that connects to the radiator, it always seems wet could that be it? does the coolant escapes from there because of the pressure?

 

it could be a leak between your intake and heads....if you havnt noticed a power loss, or the engine missing its not leaking into the combustion chamber...if its not any of that, id drop your oil pan to check for water there. it could be leaking around your lifter rods and going down into your oil pan

 

check out your wet spot, sounds like a likely candidate. yes you have moderate higher pressure inside your cooling system, so its always trying to leak out. the pressure is at its highest for about 15 minutes after you shut off the truck. thats a good time to inspect for leaks. if you don't find it, you (or a shop) can run a pressure test.

^umm, no need to drop the oil pan. if you have water/coolant in the oil it will appear as a milky white film on the dipstick. when that happens, its officially a bad day.

 

so why wouldn't the coolant appear on the driveway?

 

head gasket

 

Because it is evaporating on the block, radiator, intake or exhaust manifold, or even a hot hose.(only takes a pin hole)

And what is this thing you say is connected to the radiator hose? Are you talking about the heater hose that goes into the firewall or the hose that connects to the radiator?