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Old 08-06-2011, 10:01 AM   #1
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Angry A/C problems Freightliner

I have a new 2011 Coachmen Sportscoach (diesel pusher). When sitting still and idling, my dash a/c blows out very cold air. Start to drive and within a half mile the air blowing out is Luke warm to warm. Normal or not?
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Old 08-06-2011, 10:27 AM   #2
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Is it a Cummins with a side radiator by any chance? If so, the air conditioner fins may be "stacked" with your CAC and Radiator and when driving you fan may not be able to push enough air all the way through all three. I only assume your fan does run. Then check run of the hoses going to and from the a.c. unit to see if they are in contact with anything hot.
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Old 08-06-2011, 12:36 PM   #3
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Thanks, I will check things out in the engine compartment. BTW it is a 340hp Cummins.
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Old 08-06-2011, 01:49 PM   #4
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Quote:
Originally Posted by slwohlford View Post
I have a new 2011 Coachmen Sportscoach (diesel pusher). When sitting still and idling, my dash a/c blows out very cold air. Start to drive and within a half mile the air blowing out is Luke warm to warm. Normal or not?
No, it is not normal. You have a brand new coach and the dash a/c should blow cold when it's idling or driving down the road.

You're under warranty. Take it to a Freightliner shop and have it checked out.
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Old 08-06-2011, 02:24 PM   #5
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[QUOTE=slwohlford;923593]Thanks, I will check things out in the engine compartment. BTW it is a 340hp Cummins.[/QUOTE

I think this is one of THOSE red engines. Maybe an IS-L. But what does a yellow engine guy know? In that case when you look at your side radiator the a.c. will be the only one or outermost one visible. On the forward side will be the two a.c. hoses. Good luck trying to get to them.

BTW how is your engine temperature climbing long, steep grades?
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Old 08-06-2011, 04:17 PM   #6
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Since it is new coach, let the dealer fix it. At road speeds, the A/C should cool better. check that you do not have an outside air open or trying to go into heater mode.

Something is not right, so do not let the dealer snow you with typical B.S.

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Old 08-06-2011, 04:42 PM   #7
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a/c should be ice cold all the time.

And a 340 hp sportcoach will be a rear rad, most likely a 6.7 liter ISB
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Old 08-07-2011, 10:19 AM   #8
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Thanks for the help

MH is scheduled into dealer next week for a two week remedy of small problems. I will insist that they take it to Freightliner if their tech is clueless for some reason.

This forum appears to be priceless in the future for receiving recommendations from folks that have "been there, done that". Problem is I don't know a muffler bearing from a kanootin valve.

We're headed for Disney World in September with my daughter's family of 7. Will be a bonding experience to say the least.
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Old 08-08-2011, 01:34 PM   #9
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Problem is I don't know a muffler bearing from a kanootin valve.

Kanootin Valve is usually red after some use.

Muffler Bearing is hard to find because it's located just behind the turn signal fluid reservoir.

Hope this helps
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Old 08-08-2011, 03:24 PM   #10
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Quote:
Originally Posted by slwohlford View Post
I have a new 2011 Coachmen Sportscoach (diesel pusher). When sitting still and idling, my dash a/c blows out very cold air. Start to drive and within a half mile the air blowing out is Luke warm to warm. Normal or not?

classic LOW charge (volume)
as your engine rpms ramp up the compressor has to move more refrigerant....if its low it cant move as much so the temps come up

since its new...i would suspect it is low or leaked out during sitting around waiting to be built or sitting on a lot, seals leak..

have it checked under warranty
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