I have a 91 plymouth voyger and have problem with pressure building up in my radiatior hose. what could be the

I have change the radiator, water pump, hoses, themostat, and pressure is still building in the top hose with 5 mins of start up.
I have a 91 plymouth voyger and have problem with pressure building up in my radiatior hose. what could be the
1988 caravan with 3.0L engine did that. It had a bad head gasket. The hole was so tiny only a small amount of pressure coould get through. In time it will get bad enough to squirt antifreeze into the engine and it will have a very sweet smell when you first start it.
I have a 91 plymouth voyger and have problem with pressure building up in my radiatior hose. what could be the
Well, you should have some pressure in the hose, as the entire system is pressurized.

If you've already changed everything else, like you said, and the pressure is above normal (between10-15 psi), Then either check for an obstruction in the system, or have your radiator cap checked. The cap is set for a certain pressure, say 15 psi. If the system builds more than 15 psi, the cap will vent the excess pressure, but if its stuck or worn out, then it will build a lot of pressure
IF it's ALOT of pressure %26amp; keeps building UP U might gave a Blown HeaD Gasket.Fill the Radiator up %26amp; start the engine %26amp; look if there are ANY bubbles coming up in the water where the radiator cap connects (filler neck).LOOK 2 C if the Engine oil is Black or clean OR MILK Colored.If Milky U have a cracked head or engine block.OR if the Thermostat is in backwards.
how much pressure? a little pressure below say 5 psi could be normal but more than that may be indicative of problems. does the engine overheat?

if so you could have a cylinder head gasket problem.

go to napa buy a block check kit.

remove radiator cap and lower coolant level about 1/3 to 1/2 gallon.

fill block check device with it's blue liquid to the full line. cram stopper in radiator cap opening ans start cold engine. allow to run until thermostat opens. if blue liquid turns greenish or yellow then exhast gases are present in coolant.

most likely blown head gasket- remove head and have a machinist resurface it. and check for cracks.
could be a cracked head or blown gasket,remove radiator cap when engine is cold ,start engine and look for constant bubbles in coolant,there will be a few bubbles at the start but they should clear after a few mins.If there is constant bubbles it mmeans compression is getting in to cooling system.