Originally Posted by dr.lee.baugh
The coolant in the resevoir fluctuating between 'Add' and 'Full' when the engine is cold vs. hot is completely normal. You can do as others have suggested and mark the resevoir and see if it drops on a daily basis- but even that will have some fluctuation in it based on the ambient temperature outside. Just keep an eye on it, if it never gets below the 'Add' level, your fine.
As SvenskaJeepGuy states, what you are seeing is most likely normal for your operating conditions.
Cold Temperatures + Short Trips = Moisture in Oil.
The colder the temperature and/or the shorter the trips, the worse this is going to be, as the engine does not have a chance to get up to normal operating temperatures to burn off the water that forms from the changes in temperature.
Wipe off the oil filler cap and take the Jeep on a good 30min run. Check under the cap after - if it is clean (which it should be), your fine. If it is all gunked up again, then I would suspect some other cause.
Thanx I changed the coolant like a month ago, I have bee monitoring it and as temps drop so has the coolant but it has never dropped below the add mark thats where its currently now, i will keep a watchful eye on it. Yesterday I removed the oil filler cap and cleaned up the gunk on it and also wiped the dirty stuff on the oil dipstick then was many suggested I went on the 30 minute drive and first pull of the engine oil dipstick was clean so were the 5 npulls right after that. I couldnt check the oil filler cap because it seems that since the oil warmed up it sealed itself shut, This morning I was able to budge it open and there was moisture as in alittle bit of water on the oil filler cap but no gunk the oil was clean as it should be. Is a little moisture still normal? I know I probably need to drive it more to get all the moisture out.
I was trying to check the Pcv Again but the damn filler cap sealed itself shut it only budges so much then it gets stuck. Any advice on how to get it opened, I tried a rag and I almost pulled the skin off my hand. Plus Im not sure how to detach the pcv, from what I understand Im supposed to pull off the hose, but this one is actually connected to a metal line and somewhere near the pcv theres like a rubber tubbing over it. at what part am I supposed to pull? I dont want to break it, Ive read online of people breaking theirs< I know after I remove the hose then im supposed to twist the pcv counterclockwise. correct me if Im wrong.