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Date:         Wed, 26 Apr 2000 09:50:56 EDT
Reply-To:     kenneth d lewis <kdlewis@JUNO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         kenneth d lewis <kdlewis@JUNO.COM>
Subject:      Re: Q: AC modification
Comments: To: Thomas.W.Moritz@NWW01.USACE.ARMY.MIL

Tom; Sounds like an interesting project. I suggest you look at the A/C units from the 85 Vanagon era. Our 85's evaporator is housed entirely in the drivers era, above your head. That way it would be a clean installation for you. I would think the expansion valves would regulate flows according to temperature/fan setting. Many mini-vans have dual systems. It should not be hard to find parts and assistance.

Drive Safely & Good Luck Ken Lewis <Kernersville,NC> 86 VW crewcab;60 356B Coupe --------------------------------------------------

On Tue, 25 Apr 2000 09:42:56 -0700 Tom Moritz <Thomas.W.Moritz@NWW01.USACE.ARMY.MIL> writes: >Those of us with AC'd Westies know this system isn't the best in the >world. >Due to the large volume of air between the AC discharge and the front >of the >vehicle the coolness of the AC often does not reach the front. When >we >lived in South Carolina I often considered installing a small roof top >AC >unit in the luggage rack just to cool the front cab of our Westy. >This >would have required sizing up the alternator which until recently I >didn't >think was an option. > >As an alternative I thought about building a parallel evaporator coil >which >could be mounted on the headliner between the driver and passenger >seat. >Basically this would be an air handler unit consisting of a solenoid >valve, >expansion valve, evaporator coil, fan, controls, and louvered vents >all >contained within a single housing. A liquid line and suction line >would >have to be run to the unit as well as power and control wiring. I >would >probably also install a solenoid valve before the existing expansion >valve >to permit independent control of the rear zone. > >My questions for the list are: > >1) What is the size of the existing system in BTUs/HR or tons? > >2) If I install a parallel expansion loop which has a smaller >refrigerant >capacity than the existing expansion loop do I need to include a >pressure >relief to avoid over pressurizing the high pressure side? I'm >thinking if I >only operate the front zone then the volume of refrigerant required >will be >less than the compressor is sized for. This would trip the high >pressure >switch and disengage the compressor pulley clutch. When the pressure >dropped the high pressure switch would close and the compressor clutch >would >engage again. If the front zone is very small then the compressor >pulley >clutch would cycle frequently possibly leading to premature failure. > >Thank you, > >Tom Moritz >'90 Westy

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