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Old 07-24-2006, 03:58 PM   #1
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Getting my rig ready for some service tomorrow and started it up this evening. I am hearing what sounds like a loud aquarium pump from the front. I opened the access cover and it seems to be coming from an assembly to the upper right. Do the Hadley's have their own air pump and is this it?

Maybe this thing is on all the time but it is the first time I've heard the noise. Eveything works, good air pressure, horns work.

Any ideas??
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Old 07-24-2006, 03:58 PM   #2
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Getting my rig ready for some service tomorrow and started it up this evening. I am hearing what sounds like a loud aquarium pump from the front. I opened the access cover and it seems to be coming from an assembly to the upper right. Do the Hadley's have their own air pump and is this it?

Maybe this thing is on all the time but it is the first time I've heard the noise. Eveything works, good air pressure, horns work.

Any ideas??
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Old 07-24-2006, 06:10 PM   #3
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I too have that noise. It seems to be coming from a vacume pump. I've had it for a year or two. It only sounds like a pump when the inside heat and air control is off. When the fan or heat and ac are on the noise goes away. Just had some other work done and they found a vac leak. Have not noticed if the noise is still there. I also have an 02 Journey but an LD.
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Old 07-24-2006, 06:50 PM   #4
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That is a vacuum pump which keeps a vacuum for your ac/heat controls. There is a vacuum chamber which it pulls the air out of and the line going to the vacuum controls also comes out of it. If the pump is running continuously then you have a vacuum leak.
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Old 07-25-2006, 02:08 AM   #5
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Thanks guys. I'm taking the rig for some pre-trip service today and will ask my mechanic to check it out.
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Old 07-25-2006, 04:04 AM   #6
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I went through this "search" mission a couple of months ago.

Pop the gen access door. Look on the firewall in front of the passenger. There is a black sphere about the size softball mounted there.

Check the tubing going into the "ball". There is a small tube that is attached with a piece of windshield washer tubing. Mine was split and had come loose. Upon replcig that on inh piece of small tubing thep ump quit almost immediately.
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Old 07-25-2006, 04:08 AM   #7
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Excude the typos in the previous response. My keyboard batteries went dead.
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Old 07-25-2006, 04:22 AM   #8
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by CHIPPYSGT:
I went through this "search" mission a couple of months ago.

Pop the gen access door. Look on the firewall in front of the passenger. There is a black sphere about the size softball mounted there.

Check the tubing going into the "ball". There is a small tube that is attached with a piece of windshield washer tubing. Mine was split and had come loose. Upon replcig that on inh piece of small tubing thep ump quit almost immediately. </div></BLOCKQUOTE>

Thanks. I did look quickly this morning for any obvious leaks but did not have much time. I did notice, however, that when the Heat/AC control is in the 'Off' position, the pump runs continuously. If I switch to any other position, the pump shuts off. I think the control is the problem but my RV guy will be checking it.
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Old 07-25-2006, 05:20 AM   #9
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smlranger....it is the vacuum pump...Fixed mine by following the green plastic vacuum line under the hood to the coolant mix valve for the heater core..the green line is attached to that valve by a small piece of black vacuum hose which rots out....
to test, turn key to on position and remove the green line at the valve and put your finger over the line, if the pump stops, it is this line and the rubber hose...replace the black hose on test....
if not this line, follow the blue line to the heater black box on the left side of the firewall... the blue line attaches underneath the box in the same manner.... test it the same way....
if not this hose, start at the vacuum pump and remove and plug each hose till the pump stops.....you may have to pull the dach cover and test inside....good luck...I am betting it is the green line...RKL
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Old 07-26-2006, 07:30 AM   #10
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I experienced the exact same problem about 2 months ago. It is a vaccum leak but I have not found the source as yet. I just pulled the power from the pump so it would not continue to run and fail. It is not absolutely required for operation. Let us know what you find as source.
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Old 07-27-2007, 03:15 PM   #11
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I've recently developed the same symptom of the vacuum pump running continuously when the dash heat/AC switch is OFF. Gary, can you provide a follow-up on what was done to fix yours? Thanks...
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Old 07-27-2007, 05:01 PM   #12
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On mine the fix was simple. There was a short piece of rubber tube that connects a plastic elbow to the vacuum controlled valve (Evans valve, I believe) which is near the heater core. That little hose was split causing the leak. I replaced the 1/2" section of hose and problem solved.
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Old 07-27-2007, 05:07 PM   #13
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smlranger, I had the same problem in the spring, same short black rubber hose leaking. I removed the hose, removed the short metal tube and connected the remaining hose directly to the valve...
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Old 07-27-2007, 05:43 PM   #14
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Thanks for the replies guys. I had looked at the connections at the pump and the "softball" and found no problem there. I'll try to find the one you're talking about and check it. Thanks again.
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