Not getting enough cabin airflow from HVAC - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-21-2013, 12:14 PM
Powerstroke.org Rookie
 

Join Date: Aug 2013
Posts: 26
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Not getting enough cabin airflow from HVAC

Did tons of searches without definitive answer. I cannot get an appropriate amount of airflow from the cab fan. I have to run A/C and fan wide open at all times to stay comfortable in warm weather.

Just bought truck, 08 F-450 reg cab XLT, manual A/C, single zone.

Truck A/C works, just checked freon levels, cab fan works appropriately at all speeds, no obstructions found.

I have had the fan out (all speeds work as does fan), doors "seem" to change from vent to floor, defrost, etc. No noises or other indications.

Just weak output from fan, seems to be weaker on two driver's side vents. However, fan had good strength when I had it out of the housing and all speeds worked as they should.

Any help would be appreciated. I have similar posts while searching without any answers.

Trying to figure out the blender door setup now.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 08-22-2013, 07:03 AM
Compression Ignition Addict
 

Join Date: Oct 2012
Location: Texas
Posts: 200
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Did it have a sub box behind the rear seats? There should be 1 or 2 vent holes in the back of the cab. A Lot of people seal one or both off when installing sub boxes. If this is the caes it will keep you A/C from building pressure.
Reply With Quote Quick reply to this message
  #3  
Old 08-22-2013, 07:04 AM
Compression Ignition Addict
 

Join Date: Oct 2012
Location: Texas
Posts: 200
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Or you have a dead animal in the vents! LOL Maybe blender doors.
Reply With Quote Quick reply to this message
  #4  
Old 08-22-2013, 07:22 AM
Powerstroke.org Rookie
 

Join Date: Aug 2013
Posts: 26
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
No sub boxes, pretty much stock truck.

Which blender doors would be suspect? Temp is right, just seems like airflow is restricted. No evidence of rodents. No smell, dust, etc. Blew out the area where the cab fan sits, and nothing came out.
Reply With Quote Quick reply to this message
  #5  
Old 08-22-2013, 07:42 AM
Compression Ignition Addict
 

Join Date: Jun 2012
Location: Trinidad Colorado ,USA
Posts: 5,193
Thanks: 105
Thanked 118 Times in 116 Posts
Feedback Score: 0 reviews
Do you AC coming out of the windsheild defrost vents as well as the dash?
Reply With Quote Quick reply to this message
  #6  
Old 08-22-2013, 04:11 PM
Powerstroke.org Rookie
 

Join Date: Aug 2013
Posts: 26
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Comes out of vents only when on vent settings. All setting seem to work, just not enough airflow.
Reply With Quote Quick reply to this message
  #7  
Old 08-24-2013, 04:03 AM
ACM ACM is offline
Powerstroke.org Rookie
 

Join Date: Aug 2005
Posts: 11
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Check the air intake for pine needles, leaves etc. Drop the squirrel cage, check the intake at that point, follow it back to the outside intake. Mice love to build nests in this region.

I don't know whether the 6.4s got a cabin air filter, but if they did (can't find it in the FSM) check that for blockage as well.

The a/c does suck, I agree, but on max it should be decent. I thought the a/c in my 2000 PSD was marginal at best, surprised to find it's not even that good in my 2010 !
Reply With Quote Quick reply to this message
  #8  
Old 08-24-2013, 06:14 AM
Powerstroke.org Rookie
 

Join Date: Aug 2013
Posts: 26
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I have a 99 PSD, and a 2011 6.7, both are acceptable.

I had the whole cab fan out, no cab filter, talked to local dealer, they said to stick a hose in the condenser and flood it out. Sounds like a heck of a mess.

I keep thinking that I will find a nest, needles, etc. but have not be able to find any evidence yet. I have the truck inside and haven't run it for several days. Trying to keep the core dry to blow out any debris.

Any idea if one of the blender doors would partially obstruct airflow?
Reply With Quote Quick reply to this message
  #9  
Old 08-25-2013, 06:48 PM
Powerstroke.org Rookie
 

Join Date: Aug 2013
Posts: 26
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
How do I get to the condenser and heater core? I am down to trying to clean them out, but have not diagrams to show how it fits together.

Rode with a friend that had an 08, plenty of air moving in his truck.
Reply With Quote Quick reply to this message
  #10  
Old 08-25-2013, 07:10 PM
Compression Ignition Addict
 

Join Date: May 2013
Location: Yeah Right
Posts: 209
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Brrr, sitting in my truck right now and it's COOOOOLLLLDDDDD in here... must turn down the flow...
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 05:39 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors