Not getting enough cabin airflow from HVAC - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 08-21-2013, 12:14 PM Thread Starter
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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.
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post #2 of 19 Old 08-22-2013, 07:03 AM
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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.

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post #3 of 19 Old 08-22-2013, 07:04 AM
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Or you have a dead animal in the vents! LOL Maybe blender doors.

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post #4 of 19 Old 08-22-2013, 07:22 AM Thread Starter
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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.
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post #5 of 19 Old 08-22-2013, 07:42 AM
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Do you AC coming out of the windsheild defrost vents as well as the dash?

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post #6 of 19 Old 08-22-2013, 04:11 PM Thread Starter
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Comes out of vents only when on vent settings. All setting seem to work, just not enough airflow.
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post #7 of 19 Old 08-24-2013, 04:03 AM
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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 !
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post #8 of 19 Old 08-24-2013, 06:14 AM Thread Starter
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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?
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post #9 of 19 Old 08-25-2013, 06:48 PM Thread Starter
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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.
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post #10 of 19 Old 08-25-2013, 07:10 PM
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Brrr, sitting in my truck right now and it's COOOOOLLLLDDDDD in here... must turn down the flow...
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