stingraymax

So i've been redoing my suspension and complete rear end and installed a new dewitts radiator, new hoses, new radiator cap and a new thermostat.
the car sat on stands for almost 2 years, i filled up the new radiator and fired up the car with the cap off, and let it run for a couple of minutes and added liquid.

but now when I put the radiator cap on the top radiator hose get pretty firm, I am afraid that I might blow the hose.

what could be the problem here ??Air in the system ??
I don't smell gas fumes in the radiator.

everything worked great before installing the new radiator ( old one had a hole in it )

terrys6t8roadster

If you are concerned about there being to much pressure in the system, the radiator cap is the pressure release. Get it checked, 16 or 17 psi is max for our systems. In my cars it takes at least 3 heat cycles before I get the coolant level right and that is 2 inches down from neck. Also put the pressure tester on the radiator and see how much pressure the engine is producing, a bad head gasket? T

Alan 71

Hi sm,
Is the upper hose getting hot….is the thermostat opening?
A new radiator hose will typically feel considerably firmer than an old hose which tends to be quite soft.
Regards,
Alan

stingraymax

The upper radiator gets real hot and the bottom one gets hot too but not as hot as the top one. I tried the thermostat in hot water and it opens .

ENCSDOUG

Try this, pull the radiator cap off and start the car. Let it warm up and depending on what thermostat (180?)you have, you will see the coolant flow when it opens. This will test if you have flow. Believe it or not, I've heard about people who installed a new radiator and forgot to pull the plastic caps/plug from the input and output tubes. Not saying yours came with them or not. Just checking.

stingraymax

I let it run without the cap and I can see the flow when the thermostat opens.
So I do have flow.

USAFVeteran

Test your cap, if it holds 16 or 17 lbs of pressure, I don't think you'll ever blow that top hose.


I made both hoses on mine from some steel tubing, and sent it to Phoenix for coating, inside and out. This was the first test fit, without clamps on either end. So far, so good

ENCSDOUG

Are you running a normal temp? My upper hose looks swollen also.

Hammerhead Fred

The entire cooling system is under pressure when the engine reaches operating temperature.
If it wasn't the coolant would boil.
The tightness of the upper hose is due to this pressure.
There's always "air in the system". Why? Because you cannot compress a liquid. As the coolant gains heat it expands which means it takes up more space in the cooling system. For this reason there's always some type of "expansion" area which is why you're instructed not to overfill your system. When you do the pressure cap lets go and the coolant pukes all over the ground.

Ryan Menzies

USAF - That looks pretty sharp !

OP - You've got some good advice from the posters

stingraymax

Well I let it run and everything seems to be ok, seems that I was too cautious about that upper hose.

Thanks for the peace of mind !

vetteguy75

Got my upper radiator hose at Summit Racing www.summitracing.com

7T1vette

The upper radiator hose is the "pressure-side" hose....so it is going to get harder when the pump is operating. And your cooling system is not going to build abnormal pressure unless it is getting close to overheating. The only way the fluid is going to build pressure is if it is overfilled (and is a 'closed' system without an overflow tank) or if it turns to steam--which is not good.

Your system is fine.