im not shure why my cooling system wont relive pressure quickly. it seems to realy build up. i had one major blowup of the cooling system back in the winter (radatior split at seems, every gasket had a hole somewhere). i dont want this to happen again i got a tiny leak along the seal on my t stat housing. whats causing the pressure build up?

 

They are cheep the nice ones with the red pressure relief are about $10 and you should buy one that is only rated for 13psi that's what you are suppose to run. Some are up to 16psi.

 

when radiator cap is bad it will not hold pressure

 

so whats causing the system to build up all that pressure

 

system are supposed to have pressure in them exxcessive pressure could be exhaust gasses getting into water jacket

 

renix era cherokee have a closed pressure system youve changed yours to open system that why you have a radiator cap?

 

Without pressure, the coolant will boil....when coolant boils, it's lost its ability to absorb/remove anymore heat. The rad cap is designed to maintain pressure up to a point, then release excess (above design) pressure.

 

X2

 

hows the head gasket start jeep cold hold upper hose with hand and crack the throttle does the hose swell h20 pumps circulate coolant and dont build pressure if the hose gets hard fast and swells while throttling combustion could be entering the cooling system any loss of coolant ?

 

none just a tiny leak coming out of the t stat housing and its olny a few drops after driving several miles

 

Small leaks usually get bigger when u least expect it....time for some maintenance.