Coolant Pressure

Joined
Dec 19, 2015
Messages
1,381
Location
United Kingdom
I have noticed that my top coolant hose has alot of pressure build up in it and would like to know if it seems normal. The engine doesn't overheat or lose coolant, the gauge seems steady, the engine runs good without the radiator cap on without any coolant overflowing.

I ask this as I have only owned or worked on cars with a expansion bottle so have no experience with just a overflow tank. The pressure builds in the top hose pretty quickly, it doesn't expand much but you can't squeeze it by hand. Is this something I need to investigate further.

In the last year it has had Tee's, stat, water pump, hoses and radiator, the system is burped and the heaters are hot when required.
 
Joined
Sep 9, 2016
Messages
1,292
Location
Odessa/Midland TX
Did you clean the overflow tube and the cap on the reservoir tank?
What is the pressure marked on the radiator cap? OEM?
Did you clean the coolant system before installing the new radiator?
 
Joined
Dec 19, 2015
Messages
1,381
Location
United Kingdom
All is clean and no restrictions, the radiator and cap are OEM. My logic is to think this is normal as without a expansion bottle the expanding coolant has no where to go untill it reaches the pressure on the radiator cap. The cap doesn't open and relieve pressure so I assume it is within spec. Just curious if this is what happens to yours and others?
 
Joined
Feb 26, 2017
Messages
313
Location
Twin Cities MN
Coolant flows from theromastat out to the top hose, so it is heated in engine and flows into radiator where it gets cooled down and then gets pulled back into engine via water pump through bottom hose. So, yes that is normal. As a tip, it is good idea to replace top hose more frequently than bottom hose, for it gets most pressure and heat.
 
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