Bumping while using HVAC - normal? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 10-27-2009
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Bumping while using HVAC - normal?

I have found in a few vehicles - including my Ranger I drive for work - that when running the HVAC at idle, there is a clear, repetative bumping noise comming from the engine compartment. Today I experimented with this mistery bump while defrosting the windows in my Ranger work truck. The bump comes whether the truck is in gear or not and it happens whether I am givinng it gas or not. I've never noticed this in one of my own vehicles, so it's got me wondering if there's something wrong in the vehicles where I have felt this. Any ideas?
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Old 10-27-2009
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ac engaging?
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Old 10-27-2009
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Yeah it blows out cold air. The bump seems to come about every 20 seconds or so. I've got the hvac on now.
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Old 10-27-2009
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I think its just the compressor turning on and off on its own
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Old 10-27-2009
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i second the compressor. i know if i have my ac on i can feel the system running and vibrating. i can also hear that tick or bump of the compressor turning on/off.
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Old 10-27-2009
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Its just the compressor kicking on/off
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Old 10-27-2009
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I can hear the clicking of the A/C clutch.
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Old 10-27-2009
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Huh... I guess that's what happens when you cut the purple wire on your HVAC, ha. I haven't had AC in my truck since doing my body lift however many years ago, where my pulley ate through the AC line.
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Old 10-27-2009
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mine does this too but my AC still works.
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Old 10-27-2009
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if it cycles to much you could be low on freon
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Old 10-28-2009
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My 2006 has clicked like that since it was new. It's the compressor cycling
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