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92 cadillac sedan deville~put both sides of the heater core under water pressure and flows freely and clear~today after flushing i thought the problem was solved it actually came out hot but after 15 min of driving it was like someone threw a switch and

it could be that the vacuum

it could be that the vacuum servo has a problem and looses vacuum, causing the blend door to change from hot to cold, does it happen when climbing a hill?

climbing a hill? no~ is there

climbing a hill? no~ is there a way for me to open the blend door and ty it there?were is the blend door?i have the glove box off and the bottom pieces~i went all last winter with no heat,i appriciate your help

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