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

Question

I have change the radiator, water pump, hoses, themostat, and pressure is still building in the top hose with 5 mins of start up.

Answer 1

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.

Answer 2

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

Answer 3

IF it's ALOT of pressure & keeps building UP U might gave a Blown HeaD Gasket.Fill the Radiator up & start the engine & 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.

Answer 4

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.