i have a d16z6. when i purchased the vehicle it was overheating. about 2 weeks ago i began the long (due to my situation) process of changing the headgasket. i fired it up for the first time yesterday. but did not have time to let it run. so i went out today with more time and let it idle. took it for a quik test drive and came back. shut it off and had to run somewhere. the temp needle was reading normal. wen i came back, i proceeded to let it idle again, and about 15 mins into the idle i see the needle begin to creep. while the fan was running (switch). i walked away in frustration for bout 2 mins. came back and the needle sat at jus bout a 1/4 inch over the half way mark. can somebody give me some guidance. if u had the same problem. and if anyone can jus throw me a few pointers as to wat the key parts of heating and cooling are. the thermostat is new. the radiator has been checked. the fan is run thru a switch, the hoses are not cracked. the head was torqued down properly. cud i have air pockets still. also. im noticing that my rad cap is not closng as tight as it shud. it still retains pressure. but not like others that i have worked with in the past.......