Don,I think Mike is correct.Those closed systems on the GM won't tolerate low coolant.If they get just a little low on coolant the heater won't work.There should be a bleed screw "PROBABLY On TOP OF THE THERMOSTAT HOUSING" to bleed that air out so you can get max amount of coolant in there.That air is displaceing coolant right now.Just open the bleed screw and let the air out.You may have to do it 2 or 3 times to all the air out and all the coolant in.
matthies,take that radiator cap off with the engine not running.Look down through the top of tank at the core tubes.If they look corroded or clogged you need to remove the radiator,take it to a shop and have it rodded out.That coolant has to circulate properly or it will run warm.Running the Ac will make it run warmer with a clogged radiator.And both fans also need to work right on these cars also.Check the fan motors and the sensors.
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