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The mechanical fan works as it should.

No correlation. I drive pretty consistent. Not aggressive at all, this is not the vehicle for that. It has only happened over asphalt. Still no new cap because the system was showing a lack of being able to hold pressure when the test cap with gauge was on. The cap was replaced 6 months ago...

Water pump was replaced about a year ago. Besides that stops spinning once the engine is shut off and would be cooing the system anyway.

Agreed, most simple explanation.

I got the test kit to see if there is any exhaust gas in the coolant and there is NONE. I did the test three times, twice from the radiator and once from the radiator overflow tank. I pulled vacuum from the line running down the passenger side engine bay. Plenty of flow and bubbles in the...

How do I test this?

It is my buddy's pressure tester, he is a mechanic and uses it all the time. I guess that it is possible it could be broken but it looks like it is pretty new and in good condition. He is not the type to not know if something is broken. How would I know if there is a cracked passageway? Is...

Not specifically. There are no signs of a cracked head, the compression is good, the oil pressure is good, there is no visible coolant in the oil, it doesn't seem to be loosing any coolant and it is not blowing any white smoke, I would think that the head was ok.

So This issue still is not resolved. I did not purchase another cap because when I pressure test the system with a pressure tester, the pressure basically drops like a stone, so I know that the system is not holding pressure from some other point besides the cap. BUT there is no coolant coming...

Thank you for the clarification. Back in december I ordered an OEM rad cap expecting Stant and the Motorad cap showed up in the Mopar box

SO NOT FIXED :(. Went for a drive today (hot 90deg) and it boiled over again. I was really paying attention when I shut if off. I quick popped the hood and saw/heard like a gulping noise from the radiator past the rad cap (Motorad 16V) and dumping into the overflow tank and then boiling in...

Thank you all for your input. I was able to spend some time with the Jeep yesterday, worried I might have a cracked head I did not want this to get worse. First thing I did was check the oil, it looked fine, there was no coolant in it. I looked through the oil filler cap to see if I could...

Thanks for the response. The cap was recently changed along with the thermostat (OEM). I also just changed the oil and it looked fine. So is the coolant boiling in the overflow tank after the jeep is shut off an obvious sign of a cracked head? I looked through the oil filler hole and could...

Thanks for the response. The thermostat was recently replaced (with OEM). As far a the fan. The overflow only happens after the car is shut off. During regular operation there is no issue. What I need to know is if the e-fan is supposed to stay on after the engine has been shut off, like on...

So recently my 01 XJ, 98K, started to occasionally have coolant boil in the overflow tank and come out of the overflow tank after I would shut the Jeep off. Not every time, just randomly. The temps in NY lately have not been crazy hot. It NEVER overheats while driving or at idle and the e-fan...

Here is mine, 3in lift on 265/70/17 Goodyear Wrangler Duratecs. They are just shy of 32in

I have done some work on the XJ but the vacuum leak pre-dates that work. And it was on the cooling system and suspension. Thanks for the good advice and the link. I will definitely try tightening the intake manifold bolts and also the throttle body trick. Although I doubt it is the intake...

So on my 2001 XJ I have an random vacuum leak when I come off throttle. It is a high pitched whine only on deceleration with no throttle input. But it only happens sometimes and seems to be totally random. I can usually drive about 5 miles or so on a cold start before it will begin and then it...

I get the "No Link" sometimes only after I try to clear the codes, on my cheap reader. What I get it to do to read is once it connects I go to the live info (ie, engine temp, rpms, throttle position, ect) once it reads those I can access the codes and clear them.

I flushed the heater core again and used CLR this time. More rust particles came out and the heat is way better now. Actually warm in this fridged NY weather.