Dang Radiator cap

I replaced the water pump a few months ago and I finally got around to plumbing the heater yesterday. I also decided I should replace my radiator cap because it is getting old. The one I had was a 5lb and the replacement was a 14lb(I am assuming this is the pressure require to open it allowing it to vent out the vent line). I drove it this morning for approximately 3 miles and some guy flags me down and tells me I'm leaking something. I get home and the radiator is empty and everything looks ok(besides the lack of collant). I filled it up and drove to a gas station, I pulled over half way and opened the hood to discover that it was draining out of the vent line. I took of the old radiator cap added some water and put the old cap back on. No more leaking. Should I assume that the FLAPS sold me the wrong radiator cap. Can anybody tell me what part number or model they are using. Thats what I get for trying to replace something before it goes bad.

 

I spoke to soon. I was driving back to work this afternoon and I started losing coolant out of the vent line. Does it matter what port on the water pump housing the heater line runs into.

 

I had the same problem with my Hurricane and the problem ended when I drilled a small 1/8th inch hole in the thermostat.

 

Where in the thermostat did you drill the hole.

 

The flat piece that opens and closes.

 

I guess that was kind of a dumb question. It's was a long week.

 

just out of curiousity...
are you filling the radiator up to the bottom of the neck ?
it is normal for it to push out coolant to about 1" below the neck opening.
just a normal expansion process when warmed up or afterboil when shut off.

 

Just started loosing coolant when I reconnected the heater line. There are two ports on my water pump body. When I reconnected it I used the driver side port. I found out that the heater should be run through the passenger side port. I haven't had time to run the jeep yet today so maybe tonight or tomorrow. I replaced the radiator cap when I reconnected the heater. So it might not be a radiator cap problem.

Yeah, it was pretty empty both times it decided to "jettison" the antifreeze.

 

Don't know what engine you have but if its a V-6, then the 14# was ok, If is the 4, then it could be eather a 7# or 15# See below from the FSM.

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