About a year ago i put a new "high performance" 22re engine in my 92 P/U. As I rive it up the Al-Can I blew my radiator. The mechanic i had to go though to get the new radiator said he has never seen anyone bend retainers on the core away from the tank. Well it seems like my truck has done it again

Since I replaced the radiator 5 months ago I have replaced the head gasket, the thermostat and the radiator cap. For some reason the radiator pressurizes. When i start it up to move it the 100 feet from where i park to my garage in that time it it completely cold but manages to build up enough pressure to shoot fluid out when i open the cap

Does anyone have any idea what is causing this pressure and then trapping it. Im at a loss and have checked out all the pressure relief areas to be clear.

 

odd, try running it without a cap for a while and see what it does

 

Possibly a bad radiator cap. They should release at 11-12psi in most cases and blow off any extra pressure into the overflow, and when pressure drops too low suck coolant back into the radiator from the overflow tank.

The only other thing that would cause that kind of pressure in a cooling system is a blown headgasket/cracked block/etc. Something to run the exhaust gases into the water jackets in the block, thus quickly increasing the pressure in the radiator. You can get a tester kit for this that basically has a blue liquid in a test tube. You seal the tube in the radiator cap hole, if there's exhaust gas present in the coolant, then the blue turns yellow. Real easy test to see if you got exhaust gases leaking into the cooling system.

Start simple and cheap with a radiator cap. It's pretty common for them to go bad, especially on older vehicles.

 

Just re-read your post about moving it 100ft. There's no reason you should build up that kind of pressure. You have a bad radiator cap, i'm quite certain. It should release that much pressure into the overflow tank on its own. but it shouldn't build up that kind of pressure in 2 or 3 minutes.

It could also be something clogged somewhere, however I'm fearing the worst here. I think you got bigger problems.