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Old 08-29-2014, 10:02 PM   #1
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In dash heat & A/C vacuum problems

I recently purchased a 2000 Monaco Diplomat 38D. I can hear the fan running in the dash, and it responds to different fan speed settings, but very little air comes out of the dash vents. Is the electric vacuum pump supposed to maintain a constant vacuum in the system, or should it cycle only when there is a change to the Heat-A/C controls?
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Old 08-29-2014, 10:08 PM   #2
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The vacuum should be pretty constant. The electric pump will cycle within it's upper and lower limits. If yours seems to be running alot check the rubber vacuum tubing elbows. 'They seem to crack and leak.
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Old 08-29-2014, 10:53 PM   #3
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Check to see if the fan is pushing air thru the defrost vents. If so you have a vacuum leak somewhere. (Defrost is the 'default' position).

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Old 08-30-2014, 02:54 PM   #4
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Special thanks to KIX and Acker1 for your input. You pointed me in the right direction for my problem. When I tested the unit this morning, the air was all going through the defrost vents. I went to the vacuum pump and found no voltage getting to it. I had previously printed the Owners Manual for the Monaco Diplomat 2000 and the 2001 LE. The 2001 LE manual is actually for the 2000. I spent hours checking fuses, and circuit breakers in every box defined in the manuals.

I finally decided to remove three sizeable plastic wing nuts from a large panel in the compartment in front of the driver-side front wheel. It was there I found the problem. I replaced the 7.5 AMP fuse, and the problem was fixed. All the controls for the heating and air conditioning work properly. I have requested a wiring diagram from Monaco Technical Support; It should arrive in this afternoon's mail.

The Owners Manual makes reference to a fuse box under the dash...there isn't one there. Both manuals are lacking in information about many of the features of the coach.

Thanks again; I appreciate the help.

Randy
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Old 08-30-2014, 04:13 PM   #5
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Glad you're aboard Randy. Congrats on the new to you rig. Best of luck on gettin' it into shape. Enjoy your adventures and be safe.
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Old 09-01-2014, 12:08 AM   #6
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Thanks for getting back to us with what solved your problem. Might help others.

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