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Old 07-12-2016, 04:54 PM   #1
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E450 Dash Air Conditioning

This is more of a Ford question than a motorhome question, but in our travels today we found that our dash air conditioning (AC) seems to freeze up after an hour or so where little air flow comes out of vents. When the fan is turned to high you can hear it blowing somewhere but not through the vents. AC fittings inside of engine are frosted over and not sure if that is normal or a contributing factor. If we turn the setting to Vent from AC then in about 2-3 minutes the air flow returns to normal. At this point we turn on the AC and all is Ok for another hour or so. We are on day 1 of a 17 day outing. No big issue, but want to see if an issue that can easily be remedied on the trip or awaits a Ford garage appt when we are back home. We have a 2015 E450 Jayco Grehawk.
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Old 07-12-2016, 07:42 PM   #2
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Turn it to heat for a couple of minutes. I don't know if low coolant would make it do this but worth checking into. Someone will come on here with better knowledge. My roof AC's can freeze up here in Florida. I turn the heat pumps on for a couple of minutes and they run fine after that.
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Old 07-16-2016, 04:43 AM   #3
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Sounds like either a low freon condition or possibly the compressor is getting too hot. Check with your Ford dealer. I have had a similar issue with an old 1978 F250. I don't recall what the final fix was, but it got fixed by an independent shop.

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Old 07-16-2016, 05:02 AM   #4
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You need to check the " Heater/AC " box drain. If it's plugged, condensate will build up on the evaporator coils and freeze.
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Old 07-17-2016, 07:12 PM   #5
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Condensate drain plugged up and/or low refrigerant.
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Old 07-17-2016, 07:23 PM   #6
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E450 air condition freeze up

Clean the outside and inside coils. Not enough air going through them and they freeze up. Also see if you got a fresh air filter in the cab , if you do make sure it is clean.
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