Radiator hoses is always very hard as if it has too much pressure and we thought we might change the thermostat and we opened it and there is nothing wrong with it. We changed it anyway, still same issue. I will show the hose we have and the hose we replaced it with (images).
We have a helper (a hobby mechanic) and we flushed the radiator with a water hose and he was saying he wants to bleed it that way he can take the pressure or air flow or moister from inside (I don't know exactly but something about bleeding) and need to know what we can do through your advise and knowledge on what is the best course of action. Our helper is not familiar with our car and is limited. We have a 2001 Toyota4Runner, do you know what to do?
In addition, we want to change the cooling fluid as well.
Also, what did our helper mean by bleeding? What is the solution or potential solution in our situation?
Screenshot of radiator hoses: https://prnt.sc/12p862w
If you're worried about too much pressure in the coolant system then change the radiator cap. It has a 16 psi pressure relief valve in it to prevent the system from over-pressurizing.
The thing is, you're thinking that you have too much pressure in the coolant system but you aren't complaining about overheating. So, that leaves out a worn impeller on the water pump (not circulating coolant through the radiator fast enough).
It isn't likely your radiator cap is the culprit but they're cheap enough so replace it.
Then that only leaves pressure coming from a leaking head gasket (combustion gas leak).
Replace the radiator cap and test for combustion gasses in your cooling system.
On the top of this page on the Right side there's a TOOLS link.
Click on that and then click on Testing Tools.
Scotty recommends this inexpensive one. Then watch his video on using one of these tools.
Lisle 75500 Combustion Leak Detector. (Less than $30)
https://www.youtube.com/watch?v=v0U8Iyf0kk4
You don't "bleed" the cooling system. You drain it, flush it, refill it with coolant and "burp" the air out of it.
