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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
if Im ideling and the heater is on then the engine revs like from 500-700 up and down...if i shut it off then the surging stops...is this normal.....114,000 miles and still tickin
Pop the hood and see if your A/C is kicking in. The system might be calling for "defrost" when in heat, or an electrical issue could be making it run. The A/C sucks quite a bit of power and can make your RPMs drift.
when you are turning your heater on, are you also using defrost? The defroster will cause the A/C compressor to kick on, engaging the aux. fan as well. The PCM will therefore boost idle to assure you will not stall...
It sounds electrical. When I first hooked up my e-fan I had it running on the high speed motor and when I would run the fan, my heater blower, head lights and fog lights all at the same time I would get a little surge like you are describing.