Thump right after startup - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 12-12-2006
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Thump right after startup

Most times when I start my truck, as it idles and warms up I hear/feel a thump and I'm not sure what it is. Any ideas?
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Old 12-12-2006
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You just start it, nothing else?
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  #3  
Old 12-12-2006
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Been asked before....but it's really not a "searchable" thing.

If you ask around, there are a lot of ranger owners that have that noise. I'm one of them. Been said to be a million different things from heater doors opening or closing, to tranny noise. All in all.....it's nothing to worry about.....as long as it's only a once in a blue moon thing. If it's doing that for EVERY start, there's something not good.
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  #4  
Old 12-12-2006
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Its normal. Mine does it every time. Its your condenser or what ever the hell its called. It seems to do it worse in the winter
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  #5  
Old 12-12-2006
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My girlfriends parents expedition does it alot....


Then i got my truck and it did it, so it must be a FORD thing.... personally i always thought it was a heat shield or a piece of metal popping after warming up / cooling off

Rocky
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  #6  
Old 12-12-2006
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its the little gerbils inside your engine falling out of bed.
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  #7  
Old 12-13-2006
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Well it sounds like a common thing so no more worries, thanks guys... haha gerbils
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Old 12-13-2006
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This sounds like A/C slugging and is very common on Fords and some other brands. A "slug" of condensed liquid refrigerant collects at a low spot in the A/C system when the engine is off and is drawn through the compressor when the compressor clutch engages. A/C compressors are designed to compress gaseous refrigerant and they don't like liquids.

The compressor clutch is engaged shortly after the engine starts if the HVAC selector is in an A/C-enabled mode. Slugging can also occur after the engine has been running awhile when the mode selector is moved from a non-A/C mode to an A/C mode.

Keep in mind that the A/C compressor is enabled in several modes besides A/C and Max A/C, so this can happen even if one of the positions labeled "A/C" has not been selected.

The noise usually happens only once per trip. The sound can be mild or very harsh but, unfortunately, there is no fix for it.
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Old 12-13-2006
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yeah mine does this too and sometimes i can feel it in the floorboard
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  #10  
Old 12-13-2006
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Count me in the "does it once every couple of starts" column. More so if I leave it sit for a week or more... So Bob's explanation makes sense (like I would have expected anything less!).
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Old 12-13-2006
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u can bypass the thump by doing the A/C mod and then use the rest of your HVAC controls.
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Old 12-13-2006
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Mine does it too when the a/c compressor runs....I just usually have it on the defrost setting in the winter and it does it alot more.
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Old 12-13-2006
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Quote:
Originally Posted by 01xltranger4x4
Mine does it too when the a/c compressor runs....I just usually have it on the defrost setting in the winter and it does it alot more.
that is usually where i leave mine too, but with my efan and wanting to save mpg and have more power i have learned only to throw it in defrost for jsut a short period of time then back to vent or floor
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  #14  
Old 12-13-2006
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mine made the thumping sound the other day. my controls were in the "defrost" mode. like others, mine does it more in colder weather.
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  #15  
Old 12-13-2006
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Mine does the same thing. I normally run mine in defrost most of the time so I guess that would explain why it does it every cold morning. I always wondered about it. Thanks guys.
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