air conditioning ceiling vents not working

[mr. seaview]

i have a 1999 National Seaview. when i turn my roof air on i have about
3 or 4 cieiling vents that do not blow out any cold air from them?
all the other ceiling vents seem to be working good and blowing out cold
air pretty good.

what could cause the 3 or 4 vents not to blow out any air?? could they
be plugged up? should i take the vent covers off and look up inside and
see if they are plugged up? maybe they forgot to hook em up???

any ideas on why these vents are not working??? anbybody else have this problem? anyh help is always appredciated. thanks frankie

[Belgian]

Do you have one or two A/C units on the roof?

[Theberrys]

In our 1999 Tradewinds I get very low air flow in the vents furthest away from the AC that's on if I only run one. If both are on than air flow is good all over. The ducts are common to both AC units so both feed all vents in our coach.

Dick

[Vegasdan]

Originally Posted by Theberrys

In our 1999 Tradewinds I get very low air flow in the vents furthest away from the AC that's on if I only run one. If both are on than air flow is good all over. The ducts are common to both AC units so both feed all vents in our coach.

Dick

Yep.

[jlyon69]

Same on my 99 Dolphin. Sometimes when running 1 AC, I'll shut certain vents to direct air to others.

[Ragman]

many times I will run the both air-conditioners with the rear air on high FAn. This will allow more air to be forced out the front vents. yes, take your vent covers off and check for blockage