Weak HVAC blower
Thread Starter
|
Senior User
Joined: Jul 2013
Posts: 247
Likes: 0
From: NJ
Weak HVAC blower
Hi all, I recently changed my HVAC blower in my truck 1996 f350 PSD CC and it still feels weak. I know the mix setting doesnt work hardly, it only blows on the floor mostly not out the vents. Any ideas? Also when I shut the truck off you can hear a small hissing coming from the HVAC controls so there is a small vaccum leak somehwere. Any ideas what or why my vent isnt blowing that strong?
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
My guess is that the vacuum leak is your problem. It's likely got the blend door stuck in between a couple of settings and it isn't directing the air where it needs to be. It may even be partially blocking the flow of air. I'm betting you fix that leak and you will fix this issue as well.
Thread Starter
|
Senior User
Joined: Jul 2013
Posts: 247
Likes: 0
From: NJ
My guess is that the vacuum leak is your problem. It's likely got the blend door stuck in between a couple of settings and it isn't directing the air where it needs to be. It may even be partially blocking the flow of air. I'm betting you fix that leak and you will fix this issue as well.
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
It's not terrible. The worst part is taking the control **** out for the temperature control. It drives a cable that runs down through the dash. If you're careful you can remove it from the back of the climate control panel and just pull the rest.
If I recall correctly there are two little screws at the bottom of the trim and two clips on the top (that pull straight out). Then you can see the (two or four) screws that remove the control panel and it just comes out the front of the dash.
If I recall correctly there are two little screws at the bottom of the trim and two clips on the top (that pull straight out). Then you can see the (two or four) screws that remove the control panel and it just comes out the front of the dash.
Posting Guru
Joined: Oct 2011
Posts: 1,647
Likes: 1
From: Exton, PA
bill's right - check under the hood first. here's the line he's talking about:
its white, coming right out from under the hood hinge in the image above. mine was worn/chewed through and giving similar symptoms. I 'fixed' it with some tubing with an ID the same as the broken tube OD, some vacuum grease and some electrical tape. its been much better since - though it looks pretty rough.
its white, coming right out from under the hood hinge in the image above. mine was worn/chewed through and giving similar symptoms. I 'fixed' it with some tubing with an ID the same as the broken tube OD, some vacuum grease and some electrical tape. its been much better since - though it looks pretty rough.
Thread Starter
|
Senior User
Joined: Jul 2013
Posts: 247
Likes: 0
From: NJ
bill's right - check under the hood first. here's the line he's talking about:
its white, coming right out from under the hood hinge in the image above. mine was worn/chewed through and giving similar symptoms. I 'fixed' it with some tubing with an ID the same as the broken tube OD, some vacuum grease and some electrical tape. its been much better since - though it looks pretty rough.
its white, coming right out from under the hood hinge in the image above. mine was worn/chewed through and giving similar symptoms. I 'fixed' it with some tubing with an ID the same as the broken tube OD, some vacuum grease and some electrical tape. its been much better since - though it looks pretty rough.
Trending Topics
Thread Starter
|
Senior User
Joined: Jul 2013
Posts: 247
Likes: 0
From: NJ
To elaborate some about that rubber piece that the hoses go into, i pinched it so that i was pushing it closer to the plastic assembly it seemed to stop hissing but when i would let off it would hiss again.... Do you guys think its possible for there to be a split in the rubber? The hiss isn't horrible but its noticeable, and with winter coming i would like to have warm arms and warm feet at the same time
.
.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
That piece of rubber you're talking about is the way the lines terminate into the control assembly. If that piece is broken or loose, that's the cause of your issue. I think there are a couple of fasteners that hold it tight to t he ***** and then it should just pull straight off the back.
Thread Starter
|
Senior User
Joined: Jul 2013
Posts: 247
Likes: 0
From: NJ
That piece of rubber you're talking about is the way the lines terminate into the control assembly. If that piece is broken or loose, that's the cause of your issue. I think there are a couple of fasteners that hold it tight to t he ***** and then it should just pull straight off the back.
Thread Starter
|
Senior User
Joined: Jul 2013
Posts: 247
Likes: 0
From: NJ
Kinda reviving my old thread here but I'm having another issue. When I turn my temp control onto warm, I loose volume from the blower (its not as strong as it should be) but if I move it back to the cold side I get full volume back. Is this from crud in my blend door? And I did not fix my vacuum leak issue as previously stated in this tread.
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
Your vacuum leak may be the issue here as well. It may not be opening the blend door to the heater core, but closing it off from the A/C side. I think you need to fix that vacuum leak before you spend too much more time chasing other HVAC issues. 
Thread Starter
|
Senior User
Joined: Jul 2013
Posts: 247
Likes: 0
From: NJ
Well now Im going to throw another wrench into this, fired the truck up today, heat setting worked perfect (not that i still dont have to fix that vacuum leak..... I will get to it eventually lol. I gotta figure out what the heck is going on with my trans first
Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
Resurrection time.
Did this issue get resolved? My HVAC control has the "hissing" sound when in the "Off" position. The hissing stops when I turn the know to the "Floor" position. That's the only position I've checked.
Can this hose be reached from under the dash without removing the HVAC control? Or does the HVAC control have to come out for repair?
Did this issue get resolved? My HVAC control has the "hissing" sound when in the "Off" position. The hissing stops when I turn the know to the "Floor" position. That's the only position I've checked.
Can this hose be reached from under the dash without removing the HVAC control? Or does the HVAC control have to come out for repair?