Popped the hood to do an oil change not that long ago...and noticed there's almost no coolant in the
Res. It takes the motor a while to warm up (the temp HAS gotten colder lately, but it's got me worried...) Does the 4.0 SOHC have a coolant leak problem? Is there anything I should know? I searched "Antifreeze" in the 4.0 forum...but didn't find much. Any help or info you guys feel like sharing would be sweet. Thanks.

 

man i was wondering the SAME thing, i just poured an entire GALLON of A/F in the tank and most of its gone...

 

There's no puddle under the truck, there's no mixture in the oil, there's no spray under the body....It's kinda scary/frustrating.

 

i just looked, the res is half full... but same thing, nothing in the oil, the only puddle under the truck is oil, no steam/smoke

i'll see if whats in there goes away or not

 

I'll check my res in the morning, see what's in there. I could jus be over-reacting...

 

i would say go buy a jug, fill the res. about half way then check it every few days and see if its disappearing, i had to keep putting more and more in after i drove, but it looks like its full now

 

Does your exhaust smell like coolant?

 

mine doesn't i probably never put enough in when i smacked in on the rock a few months ago..

what are they supposed to hold? does anyone know?

 

the owner's manual should say. or there may be a data plate somewhere in the engine bay with that spec.

 

yeaaaaa, its -11 outside, wind blowing and i'll just mess with it tomorrow, if i remember lol

 

-11?! HA! I thought it was a tit bit nipply down here....it's about 28 here. No coolant smell from exhaust, although there is QUITE abit of condensation, even after the truck has been running for a while.

 

well its 2, -11 with the wind.. and im from Texas.. and its just going to get colder heh

 

Just keep adding fluid till it stays consistent as there may be air in the system. If it doesn't ever stay consistent after, maybe a gallon you can have it pressure tested to see if it hold pressure. If it doesn't there's a leak somewhere. A rad cap is a cheap thing too that sometimes needs replacing as it can leak steam.

 

I'll add fluid, first....but other than the dealer****, where might I FIND the right fluid for an 06 4.0?

 

if you go to Autozone or Advance or anywhere there are 2 brands that say "Mix with any color"

and that stays true for anything thing except one color/make i forgot what one it was, if any..

 

Mine is leaking again. I noticed a small leak last winter and then it stopped. I can smell coolant burning in the engine bay. I had the same smell last winter. Strang that it returned just as it started getting cold. I whonder if there is a sensor or a seal that leaks when the engine cools faster. I don't have a coolant smell from the exhaust, but just yesterday I noticed a sulfer smell from the exhaust after fulling some fourwheelers up a pretty steap hill.

Any ideas what may be leaking. Something on the block I assume since I can smell it burning in the bay.

 

i have all the same symptoms as you both, no visible leak or smell in exhaust and res keeps dropping level

 

Mine did that a while back but not since then.

 

Mine dropped last year and the cooling system needed a flush so i got that done, no problem since.

 

A leaky headgasket or cracked head is also a reason for dropping/burning coolant.

 

wow i thought i was the only one with this problem...no leaks no crack no smell....i just keep adding some when i notice its low...

 

another point for ford engineers...

 

Well...I noticed a thread about the 4.0L eating thermostats....so I figured I'd get some hits if I posted a thread about coolant. Didn't think it was such a common, if non-noticed, thing! Now...next question....I've the urine-yellow coolant. Not green, Not red, Not any other color in the Effing Rainbow....where do I GET said Urine-Freeze?

 

you can get the urine at any autoparts store. They call it gold.

I hear that the waterpump is known to fail as well. I do have the ticking sound that is associated with the WP bearing failing.

If my waterpump were leaking it would burn off on the engine and I would smell it the bay correct?

Also if I needed a head gasket or head it be mixing with oil and burning right? Since my oil is great and there is nothing in the exhaust that should be OK, I hope.

 

i had the same issue all summer, kept adding and adding now its fine

go figure. i extremely overheated the truck tho when i burnt a fuse for my efan, i was pulling a trailer in 95*+ weather.