Have a 2000 Jeep Cherokee 98k miles that keeps pushing out anti-freeze out the cap of radiator have replace 2 because of this. seems pressure builds and it keeps pushing out the cap. water pump seems ok had a compression test and
does not seem to have a warped head or blown gasket. anyone have a suggestion of what to do??

 

Have you pressure tested the cooling system?

 

Is it running hot? Or just building pressure?

Either way has your electric cooling fan been un-wired at any point in time? If so make sure it's not wired backwards and blowing hot air back on the motor. This happened to me a couple years ago and couldn't figure out why it was running hot. That was it.

 

Could be you got two bad caps it happens sometimes.

 

I'm thinking that the head is cracked and compression is pushing out the coolant.

 

It could be many things, but with him not giving info it's hard to help,

 

Pressure test the system, I bet $5 you have a bad head gasket, cuz I had the same problem, TINY TINY hole, caused pressures to build in cooling system, till it blew the top off. never overheated, no mix of coolant/oil, just excess pressure in cooling system. Easy to check, just take the top off your coolant overflow (when the engine is cold!) and start the engine, if you see bubbles come through the system, you have a blown head gasket.