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Old 01-03-2025, 02:36 PM   #1
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Adding refrigerant to a dash air conditioner

I have a Winnebago view 2014 Mercedes-Benz engine. The dash air conditioner is not cooling. Has anyone added Freon to this model?
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Old 01-03-2025, 02:44 PM   #2
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Adding 134a may help but without proper gauges and charts and procedures, simply adding a can of 134a may not help. If it does help, it probably won't last long.
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Old 01-03-2025, 03:21 PM   #3
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Adding refrigerates to dash air

Before you attempt watch YouTube’s on this. Chris fix it has a good one. Others are available. Then you will do it right. You might have a leak somewhere. Good luck. Travato John
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Old 01-07-2025, 05:30 PM   #4
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Originally Posted by Ch1ckad View Post
I have a Winnebago view 2014 Mercedes-Benz engine. The dash air conditioner is not cooling. Has anyone added Freon to this model?
I have adding Freon to my righ its not coach specific, its the same process for a car or RV for the most part. There are plenty of Utube videos on the topic.
I do this on my DP. I would first confirm that the Freon is 134A Most likely it is. You can buy a cheep set of gauges on amazon like this. You can also buy cans of 134a inexpensively on amazon. the kit has instructions but the bottom line is that you set the pressures based upon the temp chart provided. You keep adding Freon until you get the correct high and low pressure range. You have to turn on the AC unit to high with the fan on high and let the pump build pressure than add enough Freon to get into the correct high pressure range. you can only hook up the valves one way. This kit comes with both types of taps, you will only find the self sealing kind these days. Watch a video or two you will be good to go.
https://www.amazon.com/Orion-Motor-T...zcF9hdGY&psc=1
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Old 01-07-2025, 08:32 PM   #5
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You have to turn on the AC unit to high with the fan on high and let the pump build pressure than add enough Freon to get into the correct high pressure range. you can only hook up the valves one way. This kit comes with both types of taps, you will only find the self sealing kind these days. Watch a video or two you will be good to go.
https://www.amazon.com/Orion-Motor-T...zcF9hdGY&psc=1
You do not charge to the high pressure. You charge to the correct low (evaporator pressure). Best to get professional halp as the fix may not be to just add refrigerant and you can cause more damage.

I spent a career in industrail refrigeration and some comfort cooling. I have see people hurt and equipment needlessly damaged due to inexperience.

Ken
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Old 01-08-2025, 04:59 AM   #6
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You do not charge to the high pressure. You charge to the correct low (evaporator pressure). Best to get professional halp as the fix may not be to just add refrigerant and you can cause more damage.

I spent a career in industrail refrigeration and some comfort cooling. I have see people hurt and equipment needlessly damaged due to inexperience.

Ken
I should have said high and low pressures in the range and agree you add to the low pressure side.
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Old 01-08-2025, 07:00 AM   #7
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You first need to troubleshoot. Is your compressor working? Do you have a leak? Is your system filled with refrigerant only or is there also air in it? If the latter, the system needs to be professionally drained and the remaining refrigerant 'captured' -- do not release refrigerant into the atmosphere. Search YouTube for servicing a car's AC. Troubleshooting and servicing is generic to all vehicles and not RV-specific. You will need a vacuum pump and AC manifold gauges. Don't guess, know the exact amount.

You need to refill the system with the correct amount of refrigerant specific to your vehicle. Too little and you won’t get good cooling. Too much and you'll damage the system. Hopefully yours has a label on the evaporator (or some other component) indicating the amount of refrigerant required. If you can't find the correct amount, contact your manufacturer.

Probably best to refill when outside temp is above 60F so you can check the AC’s function/cooling as you go … the compressor will not engage in cold weather because the coach is already cold.

Recommend buying only 100% refrigerant and not refrigerant + leak stop. You won’t know exactly how much refrigerant is going in since there is also leak stop in the can. Additionally, leak stop will introduce fluid/moisture into the system and you don’t want that. If you need to check for a leak, use leak detector fluid, find the leak, repair it, check again, remove leak detector fluid, then fill w/100% refrigerant so you get peak cooling.

Good luck
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Old 01-15-2025, 11:50 PM   #8
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This confirms what the professionals advised:

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Old 01-16-2025, 06:57 AM   #9
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The attached YT video is a very good description on how a vehicle AC works. It's also one of many videos on how to service it yourself if you choose. If you do choose DIY, recommend watching a few videos to get a good handle on the process since they all have their nuances.

Good luck

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