Heater gets hot then goes cool for a sec then back to hot

nikolskynikolsky Member Posts: 1
edited February 2016 in Chevrolet
I have a 99 blazer Lt 4.3liter 4x4 I just change water pump and thermostats ad I'm having a problem with my heat getting really hot then getting cold for a sec or 2 then goes back to really hot there's no clicking in the actuators fan works temp switch works position switch works the radiator is full was I took the cap off the radiator and let the engine run for 30min hopeing it was air in the line but there was no change any help will be appreciated thank you
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