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Old 09-21-2019, 06:56 PM   #1
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DX3 BH Front A/C not as cold as bedroom A/C

While working on my 2016 DX3 today, I noticed that the front A/C was blowing cool air while the back A/C was very cold. Front thermostat set to 65 and back set to 70.

Has anyone else had this issue? Filter clean.

I'd like the front A/C to blow as cold as the back one so the inside temp is tolerable. Keep in mind that the outside temp in Phoenix today while I was working inside the unit was 85 degrees.

Thanks for any help and advice.
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Old 09-21-2019, 08:14 PM   #2
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There have been several threads on this subject and here is what I found
with mine.

Up in the overhead behind the grill there is a baffle that seperates the
supply from the return ducts. There is a thermister in the return duct that
tell the thermostat what to do. When the baffle is not in place.
Cold air goes into the return and tells the thermostat what to do.

So remove the screws that hold up the grille, take out the filter and see if
the baffle is in place and that it covers up the return duct opening.

I used foil duct tape and taped it back in place. You will know if the baffle is
not in place. If it is in place and covering up the return opening, then your
problem lies some where else.
Hope this helps
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2017 Dynamax DX3 37BH
Toad: 2019 Ford Explorer
2018: days camped 126
2019: days camped 97
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Old 09-22-2019, 09:21 AM   #3
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Quote:
Originally Posted by joet19711 View Post
There have been several threads on this subject and here is what I found
with mine.

Up in the overhead behind the grill there is a baffle that seperates the
supply from the return ducts. There is a thermister in the return duct that
tell the thermostat what to do. When the baffle is not in place.
Cold air goes into the return and tells the thermostat what to do.

So remove the screws that hold up the grille, take out the filter and see if
the baffle is in place and that it covers up the return duct opening.

I used foil duct tape and taped it back in place. You will know if the baffle is
not in place. If it is in place and covering up the return opening, then your
problem lies some where else.
Hope this helps
Thanks. I will try this and report back.
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Old 09-23-2019, 05:02 PM   #4
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I did this yesterday. Opened up the cover and fully sealed the intake side with foil tape. Was not that difficult.

Unfotunantly, the air comes out cool, as before, but not as cold as the rear A/C, still.

I went up on the roof to check the actual unit. I took off the sheth and made sure everything looked good. All appeared in order. The grill was perfect. Not dirty at all.

I took a picture of the information about the unit in case this means something to someone who might have another suggestion.

Thanks again!
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Old 09-24-2019, 12:50 PM   #5
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Quote:
Originally Posted by DX3AZ View Post
I did this yesterday. Opened up the cover and fully sealed the intake side with foil tape. Was not that difficult.

Unfotunantly, the air comes out cool, as before, but not as cold as the rear A/C, still.

I went up on the roof to check the actual unit. I took off the sheth and made sure everything looked good. All appeared in order. The grill was perfect. Not dirty at all.

I took a picture of the information about the unit in case this means something to someone who might have another suggestion.

Thanks again!
Sorry my suggestion didn't work.
All sounds normal up at the unit.
Maybe a refrigerent charge? may be in order.
I know this is an RV, but any AC guy can check and recharge if necessary.
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2017 Dynamax DX3 37BH
Toad: 2019 Ford Explorer
2018: days camped 126
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Old 09-24-2019, 01:10 PM   #6
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You should have a 15 to 20 degree difference in the intake and exhaust. Get yourself one of the temp guns. They are very accurate.
Iíve owned several camper motor homes and some acís just work better than others.
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Old 09-24-2019, 02:44 PM   #7
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Quote:
Originally Posted by parrott View Post
You should have a 15 to 20 degree difference.
But your pics show a 26.5 degree difference! Maybe your A/C is out of tolerance and too cold?
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Old 09-24-2019, 03:58 PM   #8
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Originally Posted by Rancher Rob View Post
But your pics show a 26.5 degree difference! Maybe your A/C is out of tolerance and too cold?
Yes
This is the best ac we have had out of 5 campers. I was worried I would have to install a second one but so far itís good. My wife likes it cold! Itís a Forest River Salem 26 REI with dual opposing slides.
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