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Retired VSP

Bedford, Virginia

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Posted: 07/20/21 04:52am Link  |  Quote  |  Print  |  Notify Moderator

I have a 2010 gasser BayStar and I'm only getting air coming through the defrost vents. I have the Evans Tempcon system. I have taken it to a local reputable garage and after $500 + trying this and that they have not a clue.

Has anyone had this experience. I live in Bedford, VA and I can't even find a service center who knows the system.

Any advise would be appreciated.

* This post was last edited 07/21/21 10:01am by Retired VSP *   View edit history


Bobby and Lynda
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"Try not to become a man of success, but rather try to become a man of value".....Albert Einstein

wa8yxm

Davison Michigan (East of Flint)

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Posted: 07/20/21 05:09am Link  |  Quote  |  Print  |  Notify Moderator

You have a vacuum leak or disconnected vacuum line.
The system is controlled by Vacuum "motors" and if vacuum is lost DEFROST being the most important function is the default.

On a car the vacuum is normally tapped off the brake booster but on a Motor home the brake booster is often hydro, not vacuum. so it's tapped off the intake manifold. However the leak, break or disconnect can be in many places including the selector valve or the motors themselves.


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Ranger Smith

Wherever the rig is parked

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Posted: 07/20/21 06:32am Link  |  Quote  |  Print  |  Notify Moderator

Depending on the rig . . . If it is a diesel Like Winnebago there is a vacuum pump up front in the generator compartment. If it is a gasser it is tapped off the intake. Either way you have a leak or a bad vac pump if it is a diesel MH. The vacuum hose usually cracks and that is the culprit.


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Bobbo

Wherever I park

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Posted: 07/20/21 07:35am Link  |  Quote  |  Print  |  Notify Moderator

When that happened to my Winnebago Class C, it was the famous vacuum leak. Squirrel chewed vacuum hoses, to be precise. When you looked down into the engine, you could see a squirrel nest. I had to have all of the vacuum lines under the hood replaced.

I then took a 12v tail light bulb and socket and put battery connections on it. I placed it under the hood so the engine compartment was always lit up when parked at home, and left the hood cracked open so the critters would not feel secure in there. I kept the MH plugged in 24/7/365 with a Trik-L-Start sending power to the engine battery, which kept the engine battery from running down from the constant light bulb.


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Dutch_12078

Winters south, summers north

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Posted: 07/20/21 07:59pm Link  |  Quote  |  Print  |  Notify Moderator

Which chassis/engine do you have?


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Bobbo

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Posted: 07/21/21 07:58am Link  |  Quote  |  Print  |  Notify Moderator

Dutch_12078 wrote:

Which chassis/engine do you have?

The OP says he has a gasser Baystar. According to the Newmar website, the Baystar has

Newmar wrote:

Every Bay Star is built on a next-generation FordĀ® F-Series Class A Motorhome Chassis with standard Electronic Stability Control. It features a 7.3-liter V8 with 350 horsepower and 468 lb./ft. of torque, plus new heavier duty sway bars for an even ride.


Dutch_12078

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Posted: 07/21/21 07:15pm Link  |  Quote  |  Print  |  Notify Moderator

On a post 1997 F53 chassis, check for a vacuum canister located in the lower right front corner from underneath. There's a short vacuum hose that connects a 'Y' fitting from the engine to the canister that's subject to dry rot. I use a short piece of rubber fuel hose to replace it that has a much longer life.

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