Yes the cap on the radiator is only a seal. The spring loaded cap goes on the reserve bottle to pressurize.
A spring cap on the radiator will cause the truck to overheat.
Clint
A spring cap on the radiator will cause the truck to overheat.
Clint
Not correct. There was a member who put a spring loaded pressure cap on the radiator and overheated.They only go on one way; cannot be reversed.