guys, i'll like to know where is the nut to release the air in the coolant system. is it the 1 in the pic? if not, where is it located? cause my friend said that nut was smaller than 10mm, & i've read somewhere in here it's a 10mm nut... thanks!!

B

thanks! my friend unscrew, got water flow out but he was unsure as its not a 10mm.