here goes..getting frustrated...95 gsr..106k miles..original radiator..plastic endtanks..when i first got the car..temp was normal..then on highway..goes to cold..now..leave on idle for 10-15 mins, everythings ok..temp goes to 3/4 before half..fans come on...stays normal..5 mins after fans shut off, temp goes to half..idle comes up a bit..fans come on again..while fans are on..temp is rising 1/4 past half and rising till i step on the gas to 3k..temp goes down to 3/4 before half..leave on idle..comes back up..turn heat full blast...temp goes down..WTF!..changed the timing belt and water pump..changed the thermostat..when drained the coolant..coolant was rusty color..now..is the radiator out cause if the rusty color? some blockage? if i leave the rad cap off..after 20 mins its boiling over..everythings ok before that..some people telling me could be the head gasket..exhaust air leaking into the cooling system..so either the head gasket or radiator? am i missing something? how to check the gasket? compression test? someone please help! got no ride! thanks!

 

Do you have thick white smoke coming out your exhaust? Do you have to add coolent from time to time?

 

no coolant loss..no white smoke..