Heater burping* knocking at idle WTF?! - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 11-15-2010
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Heater burping* knocking at idle WTF?!

Can anyone pinpoint what this problem is? I heard something about air pockets in the coolant hose and a bunch of other nonsense to fix this problem like steering pump, T-stat, pulleys & belts.....all sorts of shiaaat.

What is the culprit of this friggin BS coming from our trucks?!
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Old 11-15-2010
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what are you talking about...cant understand anything
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Old 11-15-2010
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so you dont have this problem do you?
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Old 11-15-2010
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what problem are you talking about
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Old 11-15-2010
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in park....truck has been running for 15-20mins. At operating temp. Heater is on....then suddenly, a thump/burp noise coming from the engine bay and a dip in rpm...radio even buzzed when this thump happened. This is only when the heat is on......?
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Old 11-15-2010
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thats definatly a weird problem...
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Old 11-15-2010
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just losing my mind here.......hoping that there might be some fellow rangers that ran into this problem and resolved it. It is most definitely happening went the heater/blower is on
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Old 11-15-2010
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i'll give it a bit.......someone will know. thanks
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Old 11-15-2010
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What setting is the heat on? AC compressor kicking in.
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Old 11-15-2010
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full heat setting..defrost....blower on min
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Old 11-15-2010
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its like a steamlock in a hose or something im guessing thats making the odd noise. Winter is starting brew up here...and im not sure if this is serious or a common ranger problem. this could be many things...but honestly, i dont even know dood
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Old 11-15-2010
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If it's in defrost your AC is on. The thunk and idle dropping is the clutch kicking on. Normal.
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Old 11-15-2010
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hmmmm interesting. Why is it so loud though? First time this ever happen to my truck, so i was kinda like WTF when it did. So this is a normal Ranger thing?
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Old 11-16-2010
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My 99 ranger does a very similar thing. After getting warm it will start thumping from the passenger side of the cabin. It is far less audible outside the cab. It will do this at idle or after coming down from highway speeds, but only when the heat is on, turning it off or on AC stops the sound. Ford released a TSB for a bypass kit for 99-01 rangers, they might have one for 07s.

Does your temperature gauge fluctuate at all?
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Old 11-16-2010
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as of now my temp gauge isnt going haywire. Its at normal op range. Wow, talk about a factory flaw. I'll keep a lookout for a TSB bypass kit......would be interesting to know if anyone here has had the conversion done with great results. Thanks for everyones help BTW.
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