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yes just loosen the bolt until water comes out. also your thermostat could be stuck closed. which will cause your car to over heat

no CEL codes

I have a 93 coupe with a Z6. when my clutch is in or im letting car warm up my idle goes from about 900 then jumps to about 3300 when its cold. when its warm it only jumps to 2800. i havent found any vacuume leakes. when the car warms up if i turn my heater on high and turn my headlights on it...

im having the same issue. did you get it figured out? mine will stop jumping if i turn my heater on high and head lights on causing a draw in power. but dont know what it causing the issue