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Ok...replaced radiator cap even tho the old one seemed to test OK. It will sit and idle at proper temp. But if you drive it 3-4 miles ay 1600-1800 rpms it will stradily begin to get hot and then peg temp gauge. As the temp is going up you can turn on the heater and it will blow hot. However at some point it will stop blowing hot as the temp climbs,
You can then stop and let it idle and the temp will come back down. However if you sit in neutral and hold the rpms steady at 3000 it takes a while before the temp begins to climb.
I'm stumped.
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