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Old 07-15-2007, 05:13 PM   #1
Carterwlsn
 
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Default A/C Recirculation

Is there any way to make the a/c recirculation stay on for more than 15 minutes? It is too hot this time of the year to cool the outside air. Is there a good reason the Germans think I am not getting enough fresh air?
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Old 07-15-2007, 09:48 PM   #2
hkpierce
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Default Re: A/C Recirculation

See http://autos.groups.yahoo.com/group/.../message/31396. Tony Andric at www.DogShowVans.com, an earlier converter of Frieghtliner Sprinter cargo vans into Dog show vans.
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Old 07-16-2007, 06:39 PM   #3
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Default Re: A/C Recirculation

Thanks, that is what I am looking for.
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Old 08-03-2007, 01:41 AM   #4
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Default Re: A/C Recirculation

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Originally Posted by Carterwlsn View Post
Is there any way to make the a/c recirculation stay on for more than 15 minutes? It is too hot this time of the year to cool the outside air. Is there a good reason the Germans think I am not getting enough fresh air?

Carter,


very good reason. If you only had the circulation going and it would not switch to fresh air automatically you would at somepoint not have enough oxygene and fall asleep. Happened to me in a Lincoln once. Nothing happend though but I switched back to normal mode right away. I much rather keep pushing the button. Also the A/C cools pretty well though. Never had the fan on any setting higher than 1.


Same reason for the fresh air from the vents above the radio in heating condition when left open. They always blow fresh air never warm.


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Old 08-03-2007, 02:24 AM   #5
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Default Re: A/C Recirculation

I just canít see how this would be possible to not have enough air in a Sprinter. They are so large, and it is just me in the van 99% of the time. Besides, like you said, fresh air always blows out the vents above the radio. Maybe at some point you would run out, but surely you would run out of fuel before you ran out of air. I have not ever seen a vehicle other than this one that does this.

" Also the A/C cools pretty well though. Never had the fan on any setting higher than 1"

Where on earth do you live? It was 98+ degrease outside today. I had the air on full blast, and I kept the air recirculation on all day and I was still sweating. I wish I had rear air! The back didnít even get close to being cool. It could be worse. I could have black instead of white. I still need to install rear insulation, and add a re-engineered recirculation switch. This should help keep me cooler.
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Old 08-03-2007, 11:02 AM   #6
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Default Re: A/C Recirculation

Quote:
Originally Posted by Carterwlsn View Post
I just canít see how this would be possible to not have enough air in a Sprinter. They are so large, and it is just me in the van 99% of the time. Besides, like you said, fresh air always blows out the vents above the radio. Maybe at some point you would run out, but surely you would run out of fuel before you ran out of air. I have not ever seen a vehicle other than this one that does this.

" Also the A/C cools pretty well though. Never had the fan on any setting higher than 1"

Where on earth do you live? It was 98+ degrease outside today. I had the air on full blast, and I kept the air recirculation on all day and I was still sweating. I wish I had rear air! The back didnít even get close to being cool. It could be worse. I could have black instead of white. I still need to install rear insulation, and add a re-engineered recirculation switch. This should help keep me cooler.

Carter,

yes the van can hold a lot of air. But when engineered they accounted for the possibility that you might have more people in there than just the driver. Once you do that that large volme of air does not last very long. Fresh air blows only when circulation is off!!! NCV3 has the same setup.
Reading your posts I am assuming you have a cargo. Would a partition be an obstacle for you. That really helps. As for the flowers: a roof mount A/C unit is the way to go. Insulation will help to stay cool and cuts down on noise too.

I live in Massachusetts. I did spend almost a year in Houston/TX and as you know it gets pretty hot and humid there. Even than I only run the fan on 1. Of course that may have had to do with my partition. Less air to cool.


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Old 08-03-2007, 03:37 PM   #7
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Default Re: A/C Recirculation

must be the partition...

Houston is a Killer for heat/humidity.

I have the passenger model, all dark glass and insluated (not well insulated) panels I will be adding insulation anytime I have a panel off for repairs or adding equipment.

In Oklahoma, texas, arkansas, even Michigan and Wisconsin I have run the A/C mostly on "3" or "4" and have wished for an '11' setting... 'cause '11' is better than '10', after all its '11'!

When the front, on "4", runs out of cooling potential (on any sunny day above 90F), we fire up the rear air. The thermostat 'roller' on the rear control is effective in hot weather, but in humid weather it is not...

To explain, the rear-air temp roller does moderate the temp of the air coming out of the back, we assume this is by turning off the compressor part of the time... what that leaves is the fan blowing (high or low), but allowing the blowing air to evaporate the moisture that was previously condensed on the coils. This feature turns the van into a realtively cool sauna.

In hot weather, the temp roller control for the rear air works better as the compressor seems to cycle more frequently.

The vent in the dash (around the radio) does not draw air from the heater core, but does use either inside or outside air depending on recirculation setting (and IS cooled if the A/C is on). This dash/radio air will be somewhat warmer than ambient when you have recirculation ON and the heater blowing hot air to the "foot" position... In this case, the intake is drawing warm air from the passenger side foot area under the dash.

On a 95F day, we have all A/C on, the front on '3', the rear on "2" to start and "1" to keep up, but we can usually close the ceiling vents on the rear air.

My wife has asthma, so the recirculation is usually on if there is ANY traffic... the van is not so tightly enclosed as to not bring in at least some outside air while on recirculation. A Lincoln might be that tight, but my '79 Grand Marquis never was. The marquis was, however, comfortable enough to put you to sleep...


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Old 08-03-2007, 05:10 PM   #8
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Default Re: A/C Recirculation

Quote:
....I wish I had rear air!
I can attest to the rear air being a life saver.

My rear air was not working for 80 days since new, at temps 120 PLUS!!!! - The front air was not enough to cool the passengers, or anyone from the behind the drivers seat.

Rear air was fixed, and now my daughter, need a blanket when itís 120 outside. AHHHHHHHHHHHHH.

I can haul flowers or meat in the sprinter now if I want, itís a walk in cooler on wheels.
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Old 08-04-2007, 01:08 PM   #9
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Default Re: A/C Recirculation

We can thank Mercedes for their ideas on recirculation. On the two older Mercs that I owned, the recirculation policy was the same exact way - active for about 15min., and then it would switch back to fresh air again.

I notice on my 2005 that when I'm at highway speeds, the air coming out of the vents blows nice and strong - especially from the dash vents. It's when I slow down to speeds between 25-50 that I need to adjust the dial and increase blower speed.

I also have the rear air unit and it is definitely a lifesaver when I have folks traveling with me. I have found, though, that when it's just me - even in the 92+ degree days we've been experencing here in Wisconsin, the dash air is more than enough to keep me cool. I run the rear when I first start up to cool off the back, and then really don't run it after that.

HERE'S A QUESTION: Is there any way that one can blow just plain old FRESH AIR into the rear cabin if you have the rear A/C unit? I would imagine that you could, but I can't find the button/switch that one would use to accomplish this. Am I dreaming again that this is possible??

-Michael
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Old 08-04-2007, 03:10 PM   #10
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Default Re: A/C Recirculation

Quote:
Originally Posted by SprinterWisc View Post
HERE'S A QUESTION: Is there any way that one can blow just plain old FRESH AIR into the rear cabin if you have the rear A/C unit? I would imagine that you could, but I can't find the button/switch that one would use to accomplish this. Am I dreaming again that this is possible??
That's a good question, Michael. I don't think there's a way to divert fresh air through the back, at least in the rear air design that I'm installing with the factory control switches.

If I'm not mistakenly, there should only be small holes or one hole through the roof to route the low/high pressure refrigerant lines and electrical.
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