I’m having trouble with my truck blowing coolant out of the radiator cap. Everything has been replaced. Radiator, cap, water pump, thermostat several times.
it runs perfectly, never overheating or anything moisture in the oil or fill cap and no moisture coming out from the exhaust. It never runs hot!!!
problem ?? Stand on it and it will blow coolant out the cap, engine temperature will go to cold and eventually it will warm back up.
Is it possible that I have an intake coolant leak?

 

Check the coolant for combustion gases. There are kits at your local parts store.

 

I have purchased 3 different radiator caps and none of them seals properly. They are too short from the top seal to the bottom pressure seal. Which lets coolant spit out the over flow line.
We pressure tested it with 15 pounds and No leaks. Then started it and run it up to 3000 rpm, held it No pressure change.
Tomorrow I will go to my Mopar dealer and get an OEM cap. 😡😡😡
A lot of checking and stress over supposedly High Quality products. Junk 2 of the caps were Stant with pressure relief levers. I found an old one from 20 years ago in my garage that I put the new rubber seal on from one on the new junk caps. 👍. Works great 😱

 

Are you actually witnessing the coolant blowing out of the cap? I thought mine was and when I checked further, it was the water pump leaking. The coolant was being blown everywhere by the belt and fan. I refused to see it initially because I had replaced said pump only 40K ago.

 

Not the water pump 👍 I just changed it the day before 😱 Definitely the cap .
How much difference between a High quality OEM and aftermarket Junk ??
Try a 1/4 inch on the distance from top seal to the bottom one !

 

sorry, I missed that somehow. Getting a Mopar cap should be an easy fix then.

 

What coolant do you use