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Old 12-03-2014, 12:02 PM   #6
chengny
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Join Date: May 2007
Location: New Hampshire
Posts: 349
Re: Heater Help

If the truck is AC equipped, make sure the compressor is not kicking in. Just pull the connector off the low side control switch (on the filter drier shell) - the compressor clutch is fed through that switch.
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