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The heater is not blowing real hot air, I have real good flow, but when it gets real real cold out, it does not get warm in the vehicle. I checked to make sure the A/C is not on by removeing the A/C clutch fuse, the heater temp does not change.
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heater control valve can be opened manually under the hood by hand to allow coolant to circulate through heater core, check connection and replace if necessary
were is the heater control valve