Hi guys,

just seeing in my engine bay, I see the cap on the thermostat filler neck is not one with a spring, hence not a pressure cap. the previous owner has I think deleted the AST, but replaced with a stainless reservoir which it does have a pressure cap, should I be replacing the thermostat filler cap with a pressure one or leave it as is ?

thanks

 

You can leave as is, you don't need 2 pressure caps...this stainless resevoir sounds like an AST to me...