okay so i was driving my jeep today and i came up a hill near my house doing about 50-55 the i got to the top and the temp gauge shot up pulled over cooleed down to 210 in a 4 minutes when i popped the hood there was antifrezze coming out of the top of the filler neck near the cap now i just replaced the cap but can it be bad also i always have to refill the plastic bottle on the passenger side every few weeks?? i need advice asap as i have to get to work tommorow night!! thank you in advance sorry bout the long post

 

Check for cracks around the base of the neck and under the cap.

 

I have the same problem. On my jeep the gasket for the tstat housing is leaking a little bit. And my pressure bottle is screwed.

 

yeah also it was like 15 degress outside and it still overheated

 

Have you ran it since then? Did it do normally?
I would start with replacing the thermostat and having a pressure test done and go from there...... No external leaks or drop in pressure test points to a internal leak for the dissapearing coolant.

 

on my 87 I had to modifie the bottle a little cuz I couldn't find the right hose to fit that step down off the bottle.Still leaks though.How ever I did find a complete hose kit on line from TeamCherokee.Com.Will be odering that along with an aluminum pressure tank from MacsRadiator in about a week.should fix my leak for good.

 

your bottle could be cracked very slightly and when it gets warm (while driving) it expands and releases coolant then when it cools off in 15 degree weather it contracts again . my old ford exploder did it all the time last year. also check around the t-stat it could be a minor leak there too.

 

yeap just when outside and checked it ran at normal temps but i noticed while driving it that when the temp would start to climb if i would make it down shift the temp would go down to normal???? i bought the thermostat and sealent is there any thing i can do about the cracked filler neck to get me throw the week? also there is a leak near the thermostat but doesnt look to bad could i really loose that much coolent through a lil leak??

 

yes u can loose a lot of coolant thru a little leak.

 

thanx guess i no what im doen tommorow morning

 

a little leak could leake litres an hour

 

Hmm, head gasket??? any water in the oil or vice versa?? If one of the water passages are compromised by the exhaust manifold, the exhaust pressure can cause the coolant to spew out the overflow and it to overheat. Of course I would start with the simpple stuff, thermostat, rad cap etc. A leakdown test would help, also check your plugs, if you have one that is real clean, that could be the indication of coolant getting in the combustion chamber and cleaning the spark plug.

 

no oil coolent mixing i just gotta do some checking around

 

i dont think that the outside air temp plays a role. im in arizona where it is never cold and mine did the exact same thing after i got my cap replaced. after i stopped messing with the cap, it was fine. just my 2cents, maybe it has to do something with pressure around the cap?