But could the cap cause all Of these problems? I'f there is any air leaking
Out can that cause the temp to raise and my water and coolant to bubble?

 

Where would it run
Out to?

 

For the thermostat, it usually the housing with the top hose and maybe the heater hose as well. Two bolts hold it on. I believe 1/2 socket. U can use the paper gasket, but RTV sealant (hi temp blue or red) will work great. I used the red on water pumps and the thermostat housing. Cover the mating surface. As long as u have enough on it. It should not leak. Go around every bolt hole. Think of it as icing on a cake, u cover the area with it where it belongs.

Get a manual. Look through it. I heard chiltons it the best. I am old school. Take it out the best way u can and look at the pictures! Kidding about the pictures!

Posted by: Dre

 

only two solution are new bottle and cap every two years or so or upgrade to open system the cooling system with the pressure bottle really kcus plain and simple, i upgrade a while back have never had a problem since heres a quick write up of the upgrade..........https://www.cherokeeforum.com/f2/ren...d-shift-63044/

 

So tru! The open was and is the best one! If you can do this, Do it!

Posted by: Dre

 

i was talking about removing the hose on the engine side top of engine (thermostat housing) and fill at the bottle still. And to answer your ? yes a cap will cause this problem. A cooling system is made to run on pressure water boils around 216deg, two things help that coolant has a higher boiling point,and pressure the more pressure the higher the boiling point so for every lbs of pressure it raises your boiling point a certain amount. so if you have a leak in your rad cap or bottle it will not build the pressure therefore you will boil over sooner. and if you hear air arou nd the hoses on the bottle pull them of and look for cracking on the nipples of the bottle. Good Luck

 

My cap won't hold pressure so. Think that the problem...

 

as previously stated the bottle may have warped, do you have axcess to a coolant pressure tester, with cap atachment?

 

I do not but I know it's bad because when I squeeze the upper radiator hose I can hear air escaping through cap