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Topic: Aux 12 volt compressor compartment "thumping" sound (actually air unloader) (Read 2340 times) previous topic - next topic

Re: Aux 12 volt compressor compartment "thumping" sound (actually air unloader)

Reply #20 –
Reminds me of my early career in the oil bidness'.  Was a mud engineer on a jackup rig, my room was directly over the mud pumps.  The floor was a steel deck with no insulation.  Normally the sound wasn't bad and was actually somewhat soothing.  Until the relief valve would go off!  Sounded like a shotgun blast just a couple feet away.  The first time it happened I jumped out of bed and ran outside looking for a life jacket ready to jump overboard.  Never did get used to it. 

Re: Aux 12 volt compressor compartment "thumping" sound (actually air unloader)

Reply #21 –
Dan, you right.  I am parked on the side of a slope.  If I not add boards to compensate some for side to side  and more front to back slope, just cannot level or it does barely hold and as coach settles a bit  over time it loses it. 

I not alone in the park needing help HWH, I think it alone only has a nine inch total correction available.

Newell next door uses about eight inches of board height under drivers front wheel

Re: Aux 12 volt compressor compartment "thumping" sound (actually air unloader)

Reply #22 –
Quote from: Michael & Jackie –
Dan, you right.  I am parked on the side of a slope.  If I not add boards to compensate some for side to side  and more front to back slope, just cannot level or it does barely hold and as coach settles a bit  over time it loses it. 

I not alone in the park needing help HWH, I think it alone only has a nine inch total correction available.

Newell next door uses about eight inches of board height under drivers front wheel

Sure beats twisting the frame and risking possible bulkhead separation or ro-lock issues by  parking unleveled and with a twist in the chassis.

Re: Aux 12 volt compressor compartment "thumping" sound (actually air unloader)

Reply #23 –
Quote from: Tim Fiedler –


ON my 2000, the 12V air pump does not have an "unloader" it has an automatic drain that opens when the pump shuts off to drain the small plastic bowl where condensed water accumulates after operation (again, I have a 2000), and a simple pressure switch (on at 60 PSI, off at 90 PSI) is in line to trigger the pump on or off

Tim Fiedler

Sure Start Soft Start - home of SureStart soft starters TCER Direct - home of Generac Approved Aluminum and Copper TCER Composite cable generator-gas-prod - home of X-Riser Gas Risers for PE installation Call me at 630 240-9139
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I think this compressor has an unloader valve. It uses the unloader air to purge water.

Tim