Does your auxilary waterpump still work? If it doesn't, unplug it. I unplugged my dad's malfunctioning pump and it hasn't done it today when I've traveled 100 miles so far and still blows cold. Might be something to look into.
Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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