lt1 rad not hard to do at all. bout 2 hours,
drain rad
disconnect hosed
diconnect 2 plugs for fans
pull upper rad shroud off
slide fan assy up & out
disconect cooler lines
slide rad out
repeat process back in
good idea to install new thermostat & drill a 5/32 or 1/8 hole in thermostat so that when you fill back up with coolant it doesn't get airbound
fill rad, squeeze hoses a bunch of times to see air pockets buble out. cap t 1 click, run at idle for bout 30-40min with heat on full blast, make sure you see the fans turn on & off twice so you know thermostat is opening and cycling the water through.
good luck, if anywhere in the nearby jersey shore area i could give you hand and also lend you a coolant overflow funnel (helps bleed system out of air)
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