So, I posted about this a while back, and the suggestions were that my A/C unit(s) may have loose seals. After checking all that, I haven't found anything that appeared to be loose. I also checked the partition that is supposed to be in place when installed for ducted vs. direct A/C. All look good and properly installed. And yet, I'm still having very little air flow through the ceiling ducts. And, in fact, just last week, I turned on both units only to get some styrofoam bits blow out of the ducts. When we first bought the rig, the A/Cs would get it cold enough to hang meat with temps outside being in the 90s. Air flow was very good then, which makes me suspect something is partially blocking the styrofoam plenum duct in the ceiling. Soooo, I've purchased a 30' long borescope that wirelessly connects to an iPad or smartphone and I'm going in this weekend to see what's inside. Hopefully it's not a critter....... to be continued...... (Oh, and I'll post pics if I get anything good!)

That sounds like a perfect plan. It would be hard to fix a problem when you don't know what the problem is.Can't wait for your feedback!

Will look forward to viewing your pics. Would like to see what it looks like up in the ceilings. Hope you don't find any critter.

I'm looking forward to what you find as well. On our last RV, the ducts weren't leaking but the were partially smashed.

10forty2 wrote:So, I posted about this a while back, and the suggestions were that my A/C unit(s) may have loose seals. After checking all that, I haven't found anything that appeared to be loose. I also checked the partition that is supposed to be in place when installed for ducted vs. direct A/C. All look good and properly installed. And yet, I'm still having very little air flow through the ceiling ducts. And, in fact, just last week, I turned on both units only to get some styrofoam bits blow out of the ducts. When we first bought the rig, the A/Cs would get it cold enough to hang meat with temps outside being in the 90s. Air flow was very good then, which makes me suspect something is partially blocking the styrofoam plenum duct in the ceiling. Soooo, I've purchased a 30' long borescope that wirelessly connects to an iPad or smartphone and I'm going in this weekend to see what's inside. Hopefully it's not a critter....... to be continued...... (Oh, and I'll post pics if I get anything good!)There's also the possibility of holes in the duct work, allowing the air to escape into the roof cavity. Just a thought.When we got our coach after 9yrs, they worked OK, but I still spent hours cleaning the evaporator from inside the coach. Not much room to work and used a long handled brush and a shop vac.As said, keep us posted.

My hoses were disconnected at the vent. Remove the outlet grills and see if the tape is damaged.

A/C Ducting - I'm going in... | Good Sam Community

DrewE
Explorer II
Jun 08, 2018
time2roll wrote:
Dang now there is another tool I must have....
My ducting is also very suspect.

Not that there's anything wrong at all with buying a new tool, but in many cases a lowly mirror would suffice for inspecting the ductwork.
time2roll
Nomad
Jun 08, 2018
Dang now there is another tool I must have....
My ducting is also very suspect.
shastagary
Explorer
Jun 08, 2018
check to see if you need to seal the ductwork right after the last vent in each duct run my duct extended at least 3' beyond the vent and was blowing into the ceiling wasting a lot of cold air it made a huge difference.
azrving
Explorer
Jun 08, 2018
My hoses were disconnected at the vent. Remove the outlet grills and see if the tape is damaged.
tropical36
Explorer
Jun 08, 2018
10forty2 wrote:
So, I posted about this a while back, and the suggestions were that my A/C unit(s) may have loose seals. After checking all that, I haven't found anything that appeared to be loose. I also checked the partition that is supposed to be in place when installed for ducted vs. direct A/C. All look good and properly installed. And yet, I'm still having very little air flow through the ceiling ducts. And, in fact, just last week, I turned on both units only to get some styrofoam bits blow out of the ducts. When we first bought the rig, the A/Cs would get it cold enough to hang meat with temps outside being in the 90s. Air flow was very good then, which makes me suspect something is partially blocking the styrofoam plenum duct in the ceiling.

Soooo, I've purchased a 30' long borescope that wirelessly connects to an iPad or smartphone and I'm going in this weekend to see what's inside. Hopefully it's not a critter.......

to be continued...... (Oh, and I'll post pics if I get anything good!)

There's also the possibility of holes in the duct work, allowing the air to escape into the roof cavity. Just a thought.
When we got our coach after 9yrs, they worked OK, but I still spent hours cleaning the evaporator from inside the coach. Not much room to work and used a long handled brush and a shop vac.
As said, keep us posted.
ScottG
Nomad
Jun 08, 2018
I'm looking forward to what you find as well.
On our last RV, the ducts weren't leaking but the were partially smashed.
doxiemom11
Explorer II
Jun 08, 2018
Will look forward to viewing your pics. Would like to see what it looks like up in the ceilings. Hope you don't find any critter.
Jeffe
Explorer
Jun 08, 2018
That sounds like a perfect plan.
It would be hard to fix a problem when you don't know what the problem is.

Can't wait for your feedback!

Forum Discussion

A/C Ducting - I'm going in...

About Motorhome Group

Related Content

Heat ducting

Mouse Smell In Ducts Over 1 year now - will it sell?

TC Furnace & Basement Ducting Questions

How cold can you go?

Gasoline and Diesel going up in price