i have an 88 Cherokee. And when i go out and drive for a little bit the cap on the coolant reservoir doesn't pop off but water stats seeping out of the top. any ideas why ? water pump is pumping water i was gonna take the thermostat off but when i checked it there wasn't even one there. Im thinking maybe there is a clogged hose or something

 

It's a closed system, which means the cap on the reservoir has notches in the threads to help relieve pressure. You must have air in the system. It's trying to "burp" the air out by seeping out of the cap. Try bleeding the cooling system by loosening the temp sending unit on the back of the block, when coolant starts to seep out, tighten it back up and your good to go.

 

yea i just read about that im gonna try it tomorrow. do i have to park it on a hill or can i just open it up while its flat ??

 

If the PO removed the t-stat, that should be a red flag indicating cooling system issues......maybe time for some cooling system R&R. Band-aids might need replacing.

 

new bottle and cap time most likely found this info or convert to open system and never buy another bottle againhttp://www.jeepforum.com/forum/f11/c...ottle-1099246/ all air must be out of system