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Old 01-21-2014, 07:49 AM   #1
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Location: Angleton,TX
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Air Horn works low Psi but not full psi?

Hey guys, I have looked for answers and have had no luck so here it goes.
I have a 98 H/R Imperial. It has a (Momentary) air horn switch on the left upper dash. It also has a horn button on the Steering wheel that (only) Controls the Electric car horns.. lol lol
The Air Horns will only activate when the PSI is low, like 50-80 psi. Once the air gets to full operating PSI, the realy under the dash still works, but the air horns will not.

My questions are this:
1. IS the Air Horn switch on the Dash supposed to be Momentary or switched as in (ON-OFF)?

2. Is the Steeting wheel button supposed to activate the Air Horns as well as the electric car horns? (Which are a joke on a MH!) lol

3. Why do the air horns only work at low PSI, but not at operating psi?

I am thinking questions 1 and 2 are the reason of question 3, but no one has been able to help me..

Any help would be greatly appriciated.
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Old 01-21-2014, 08:03 AM   #2
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Location: Louisville, KY
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I don't have a Monaco, but I think they are all mostly the same. My air horn switch is on or off. When on, if I press the horn on the steering wheel, I get air horn. If it's off, the "car" horns work (which I agree are a complete joke).

The only thing I can think of is you need to remove the electric solenoid that controls the air horn and clean it. Maybe when it's under high pressure, the electric solenoid can't open. You should be able to easily find that under the hood in the front. That has to be where the problem is.
Mark Anderson - FMCA 351514 - NRVIA Certified Level 2 Inspector
Louisville, KY
2011 Tiffin Phaeton 40QTH
2006 Jeep Commander
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Old 01-21-2014, 08:08 AM   #3
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Here's a link to some previous threads that may assist.

Cliff,Tallulah and Buddy ( 1999-2012 )
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Old 01-21-2014, 08:31 AM   #4
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Air horns are reed insturments, Like a Saxaphone or clarinet, only they use a metal reed.. If the reed is bent slightly, or if it's rusted, then sometimes when you hit it with FULL PRESSURE, it sticks and does not vibrate.

Whistles do not have reeds and thus work better with higher pressure.

You need to replace the trumpets.
Home is where I park it!
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Old 01-21-2014, 08:46 AM   #5
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It's strange because (tested) the realy will show power going out to horn at low psi and the horn works. (Tested) at Full psi and the realy works but not sending power to horn.
I am thinking it may have to do with the switch itself? Its momentary which makes no sense to have to take your hands off the wheel in order to activate the air horn. I will look to see if I can find a switch, but I'll try and hold the switch (on) and push the steering wheel button and see what happens because I have not tried that yet. lol
Thank you for the input so far guys.
Current, 98 H/R Imperail 40WDS 8.3L 325 HP/ Allison.
Past, 2000 National RV Sea Breeze 8341 34.5' V-10 Ford
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