pressure cap-if your system is tight, no leaks, then it is normal for the upper hose to be hard when the system is up to operating pressure. when it is not hard, then either the pressure cap is leaking or there is another leak somewhere else that prevents the pressure from building up like it should.
While the engine is warm after a drive, squeeze the radiator hoses, paying particular attention to areas where the hose bends. A radiator hose in good condition should feel firm, but not hard. A radiator hose in poor condition feels very hard, spongy, or soft. A soft hose or a hose with a soft spot should be replaced.
Also, what causes pressure in radiator hose? As water heats up it expands increasing pressure in the system. Being that water flows through the radiator hose it is also under pressure. The systems are sealed to hold this pressure for one main reason. Water under pressure has a higher boiling point.
Subsequently, one may also ask, is the upper radiator hose supposed to be hot?
Etc. The engine is also designed to run at a certain temp, usually around 180-195 and anything cooler could actually hurt the engine by creating hotspots in the cyclinders. As for radiator hoses, the top hose is genally hotter and breaks the most.
What causes upper radiator hose swelling?
There are three primary causes for a hose to become swollen. The first is too much pressure. Finally, hoses can become swollen when exposed to very high heats. If your engine has overheated (due to a stuck thermostat, low coolant or for some other reason), it’s possible for superheated coolant to swell the hose.
Why are my radiator hoses hard?
Registered. hard hoses can be a sign of the cylinder pressure entering the cooling system because of head gasket or cracks. The hoses are suppose to get hard as the engine reaches operating temp but you should be able to squeeze them especially after a short drive where the car reached operating temp.
Should my top radiator hose have pressure?
most systems for small blocks use a 13-15 lb. pressure cap-if your system is tight, no leaks, then it is normal for the upper hose to be hard when the system is up to operating pressure.
How can you tell if your radiator is bad?
If you suspect your radiator is going bad, watch for the following symptoms: Leaking coolant onto the floor. The coolant flows through the radiator, so if there is a leak in the radiator, coolant will leak onto the floor underneath the vehicle. Vehicle overheats. Sludge in the radiator. Low coolant.
What hoses are connected to the radiator?
There are two hoses that connect to the radiator. The upper hose attaches from the top of the radiator to the top of the engine. The lower hose attaches to the bottom of the radiator to the water pump of the engine.
How do I know if my coolant hose is bad?
If you suspect either of these hoses is failing, you should look for these symptoms: 1) Leaking coolant. If you notice a puddle of green fluid beneath your vehicle, there’s a good chance your vehicle is leaking coolant. 2) Engine overheating. 3) Low coolant. 4) Collapsed radiator hose. 5) Radiator hose is broken.
Why would coolant overflow from the tank?
What’s Causing My Coolant Reservoir to Overflow? Coolant, or antifreeze, is essential to regulating the temperature of your vehicle. It’s also extremely toxic and designed to stay inside a closed system. If you’re seeing an overflow, it could be due to a radiator cap, thermostat, water pump, or radiator malfunction.
Should your bottom radiator hose be cold?
If you have a problem with your coolant temperature, and you realize that the lower radiator hose is cold instead of hot, you could be experiencing problems with the radiator system that needs to get fixed.
How do I know when my water pump is bad?
Here are some common symptoms that hint towards having a bad water pump: Coolant leak at the front-center of your car. Water pump pulley is loose and making whining sounds. Engine is overheating. Steam coming from your radiator.
Should the bottom radiator hose be hot?
Bottom hose SHOULDN’T be hot. As that stuff is going into your motor to cool it, the TOP should be hot, as that is the coolant that has just cooled your motor. Hot coolant enters the top, flows through the radiator, out of the bottom, into the engine. It is fine.
How do you test an engine water pump?
Check coolant level at the coolant overflow tank. If your water pump is run by a belt, check that your drive belt or serpentine belt is not loose; a loose belt will not allow the water pump impeller to push coolant at the proper rate, causing your engine to overheat. Check for a stuck-closed thermostat.
Why is my top radiator hose hot and bottom cold?
Lack of Coolant in the Engine The coolant is elated in and out of the radiator by upper and lower hoses. Thus, making the lower radiator hose to heat up. It may happen that your car might get low on coolant and is not able to reach the lower radiator. As a result, the lower hose emits cold air.
How do I know if my thermostat is stuck closed?
Symptoms of a Bad or Failing Thermostat Temperature gauge reading very high and engine overheating. The first and potentially most alarming symptom will be the temperature gauge reading high into the red within the first 15 minutes of your vehicle engine running. Temperature changing erratically. Coolant leaks around the thermostat housing or under the vehicle.
How do I know if my radiator is flowing?
Start your car’s engine and allow it to idle. Look through the radiator filler neck to see if the coolant flows. At this time, it should not be flowing as your car has not reached the operating temperature to cause the thermostat to open. If you find the coolant is flowing, it means the thermostat valve is open.