Evans Dash Air Nightmare

oldave wrote:

rasuth wrote:
I have a 2001 HR Ambassador. The Evans Tempcon P/N on the molded plastic evaporator housing is the same as referenced, and also has cracks. I was able to find a couple of PDFs of a service and trading manual (the web link doesn’t have much other than a knowledge base with little knowledge). The Newmar training pdf has a schematic of a typical pusher install wth a vacuum pump and reservoir (troubleshooting guide points to this), but my install has a box with the 12= supply, the vacuum line to the reservoir and a red polyethylene line going to the back. Is there an option to get vacuum from the diesel? I didn’t think that worked with a turbocharged diesel. Anybody know?

Here is the way I understand our air cond .
Monaco used dash air from the autos industry .
These air conditioners used vacuum to control system .
You are right that diesels don't generate vacuum like gasoline
engines so we have to generate our own vacuum
They did this by 2 different ways , one is a box looking device
that has a ventura inside where air is passed through to generate
vacuum . More recently they use a 12volt vacuum pump , borrowed from
auto industry , Ford I think .
Mine is mounted above the generator on the firewall .

Well lets update your Understanding.
1. RV Motorhome makes do NOT utilize Dash Air from the Auto Industry(including Monaco). They are supplied by companies that specialize in aftermarket Dash Air systems for the Motorhome market. Been this way for over 40 years. The only exception was the original 1979 thru about 1985 Silver sided Chevy Chassis Airstream motorhomes Class A
2. ALL DIESEL Dash AC systems use a 12 volt vacumm pump to supply the needed power to move the Air Damper doors when the Motorhome has a Vacumm activated system.
3. Most modern Diesels/Gas in the past 10 years or less use a Electric motor activated Damper door system Like a Denso system. I believe all Evans/tempcon use Vacumm systems. So, If you have Evans/tempcon you have a Vacumm system. Doug