stumbles when defrost on - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 09-05-2009
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stumbles when defrost on

it stumbles between 2500 and 3500 when the defrost is on...i have looked around for a vacuum leak and strayed carb cleaner to no avail...

it also sounds like water is running or sloshing around under the dash to when i have it on...
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Old 09-05-2009
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Does it do it with the A/C on or only in defrost mode?
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Old 09-06-2009
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Tried on the way to work this morning. And it does it in any position but off.
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Old 09-06-2009
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our 2.3 motors are weak as hell with any form of air on, heat or otherwise. i know i have to turn off my ac when i stop at a light otherwise itll bog when i start moving again
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Old 09-06-2009
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Set the selector to Panel only (dash vents) and see if it still does it. If it doesn't do it in this position I'd suspect you may be low on freon and the A/C compressor is quickly cycling on and off at higher RPM and would feel as though the engine is momentarily stumbling.
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Old 09-06-2009
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ya i did that earlier....it does it no matter what position....just top vent, lower vents, ac, defrost....every spot....

and its not just because they are turds....runs great ac on take off from a stop no prob...


for example: I put it in 4th gear and set cruise at 58 which is around 2800 rpm.... selector in off position...cruise along without a miss...turn selector one to the left(vent)...and has a little miss or stumble...also a hesition or lurch when you get off the gas and back on...
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Old 09-06-2009
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OK try this. Unplug youíre A/C Compressorís electrical connector and try it again going through the full range of selector positions and see is it still stumbles. Take a look through this link on the vacuum system operation specifically the vacuum application chart. HVAC VAC Chart
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Old 09-07-2009
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I am guessing the connector is right on the ac compressor....havent looked yet gonna try before I leave for work...
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