AC/heater control head
Thread Starter
Drifting
Joined: Aug 2012
Posts: 1,650
Likes: 2
From: Tulsa Oklahoma
I have been investigating the whole HVAC thing on my 74. Mine does not blow out of the vents either even though I can hear the fan changing speeds when I move the switch to the different positions. If you look down in the fender on the passenger side of the windshield wiper trough you will see the fan. I believe (and I am no expert) that one of the doors in the HVAC system under the dash are jammed in a position that does not allow the air to flow out the vents. I need to dig into this as well, but am going to wait until I am ready to shut down for the winter before tearing into the dash. I am worried that once I tear into the dash I will open a big can of worms that will keep the dash open for several weeks...I don't want to lose the driving time right now.
I will be interested in whetever you find out...I will be in this boat soon enough.
John
I will be interested in whetever you find out...I will be in this boat soon enough.
John
Le Mans Master
Joined: Dec 2007
Posts: 6,422
Likes: 591
From: McHenry Illinois
The part of the fan seen from the cowl area is the suction side, inside of the blower wheel. Many times there is debris, leaves, mouse nests etc that block the evaporator core and won't let air pass.
Thread Starter
Drifting
Joined: Aug 2012
Posts: 1,650
Likes: 2
From: Tulsa Oklahoma
Any recommendation on how to check this or do I just have to pull the evap core to figure it out? I pulled the blower last winter when the engine was out of the car and it was fine.
Thread Starter
Drifting
Joined: Aug 2012
Posts: 1,650
Likes: 2
From: Tulsa Oklahoma
Drifting
Joined: Feb 2005
Posts: 1,583
Likes: 5
From: Richardson Tx.
Today I removed my blower motor/fan and stuck my camera in the opening. I was able to take a pic of the fan side of the Evap and check the debris. Not easy to remove the fan but can be done.
