[Charles]

I have heard from several owners lately who are displeased with air flow in the driver’s area of the coach the same concern. Apparently the air flow in the front is biased towards defrost at the expense of air flow from other dash vents.

Some have gotten at the ducting and modified it to cure that problem by either moving a damper or blocking some air flow to the defrost.

[Archived]

Thanks Jon,

If I could find some black plastic to make a deflector, that may be easier than digging into the dash.

[Peter]

I agree. I am OK with the air distribution on my coach but if I had issues with too much coming from the defroster vents I would likely take a piece of tape across the defroster outlet(s) to see if some form of restricting air flow did send more to the outlets I want with increased air flow.

I don’t know where you drive or how important defrost is to you, but I do know from experience our windshields are a huge source of both heat and cold so I would not make changes that took a lot of effort until I could do some quick and easy modifications to test the results. Some owners have dealt with the issue just by adding a fan to the dash, like those you see on trucks.

[Archived]

Jerry,

I have the same problem, huge amounts of defrost air, but little out of the dash vents. Haven’t started digging into the dash yet, but I’m going to.

[Bob]

Jon, I live in Ga, so as you know, I’m in humidity and heat a lot of the time. Most of my traveling is in the southeast. It really bugs me when its raining, and warm outside, so then the condensation starts on the windshield. Looks like a large glass of icewater sitting outside.

Tom, let me know what you find out, I’ll do the same if I dig in the dash.

I called a Prevost guy where I bought my coach, and he said “lots of people have the same problem, and most devise plastic deflectors”

[Archived]

a spray solution for glasses.. I have used on windshield/inside. With good results. Bob

[Jerry]

Jerry, we used to live where sub zero temps were possible and we needed all the heat we could get onto the windshield. Even then we had to drive with blankets across out knees since the cold air spilling from the windshield was keeping us cold. So with that mindset you can understand why getting maximum defrosting was important.

But now that I am a Damn Yankee and almost all my driving is in the humid south east I know what a PITA it is to have to use the wipers on a humid day because of condensation on the outside of the windows.

I suspect the only solution is to craft some type of cap or damper that you can drop over the defroster vents but only if it redirects more air to the other vents. If it doesn’t send more air to the other vents then it appears your only option is to create an extension to the defroster vents to reaim the air flow back towards the front seats, but making sure it is capable of either being removed or redirected when you need defrosting.

I have been lucky because all of my coaches had good airflow directed pretty much how I wanted it. I don’t envy what you are going through because unless the solution is easier than I imagine it is going to be difficult or ugly or both.

[JIM]

Over the weekend, my wife tried laying rolled up towels over the defrost vents. The force of air was so great, the towels were suspended in air.

[Archived]

Duct tape.

Step one is verifying that restricting the defrost vents accomplishes what you want.

[Chris]

Good Idea, I’ll try that.

[Jim/Chris]

OK, I tried duct tape on the way to Prevost in Jax. Once the duct tape was applied over the vents………the air blew out of the dash vents perfectly. So, that told me the blend door was not working, or something similar. When at Prevost, I asked them to check the vent issue. Their response was after looking, that the H models have blend door issues, and most have the same problems, and no mechanical fix for it.

So, I’ll just find some material to place in the vents to restrict flow when not needed.

[Archived]

What is needed now is decorator duct tape to bring function and beauty together to solve a problem. But more likely the best solution is to have vents with adjustable dampers so the vents can be closed except when defrosting is required.

But wait…………isn’t that what the Prevost dampener door is supposed to do??????????

[Jim/Chris]

I found this

[jack]

OK boys and girls. Jerry has discussed a problem that is not unique to his coach. I know for a fact our very own Tom has rather anemic AC vents, but his defrosters are moving a lot of air.

So what is needed is some elegant means of providing some regulation of the flow to the defrosters so that air can be diverted to the dash vents for air conditioning. The obvious solution is to tear the entire dash apart and fix the Prevost ductwork design so it accomplishes that, or go in a different direction and create an adjustable defroster vent that is dash mounted so an owner can add it with a minimum of effort.

Who wants to make the first suggestion? The person offering the best design gets a free one year membership in PC.

[Bob]

Sounds like to guy who once owned a metal fab shop (Jon) would be in a postion to make an ajustable vent that slips into the current vent from the back. A little lever attached to a shaft with a deflector mounted to the shaft.

Or a plastic moulded insert that does the same tning.