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alan
i havent noticed a drop i get about 7 with or without and most trips last month and this i use the overhaed and dash air. i keep hearing about the heater core last time i checked my heater valve stops the hot water from circulating. that is the valve that is in line on one of the heater hoses.
go to autozone they have a cheap ac kit. comes with a guage.
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AL
2007 chevrolet 2500 duramax 6.6
allison 6 speed
2004 classic 28 WB , Pro Pride P-3 hitch
centramatics wheel ballancers 300-556
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