Weak AC blower motor
Thread Starter
Intermediate
Joined: Feb 2005
Posts: 44
Likes: 1
From: Corona CA
Weak AC blower motor
I have a 1974, 454 big block coupe with auto trans and air
conditioning. I am having a problem with the AC blower motor; it just
doesn't seem to blow hard enough to cool the inside of the car. It
doe's work in all three speeds but in low and medium it hardly can be
felt, and in high it just doesn't do it. Is there an after-market unit
or something to resolve this problem?
conditioning. I am having a problem with the AC blower motor; it just
doesn't seem to blow hard enough to cool the inside of the car. It
doe's work in all three speeds but in low and medium it hardly can be
felt, and in high it just doesn't do it. Is there an after-market unit
or something to resolve this problem?
Thread Starter
Intermediate
Joined: Feb 2005
Posts: 44
Likes: 1
From: Corona CA
Originally Posted by ftartaglio
I have a 1974, 454 big block coupe with auto trans and air
conditioning. I am having a problem with the AC blower motor; it just
doesn't seem to blow hard enough to cool the inside of the car. It
doe's work in all three speeds but in low and medium it hardly can be
felt, and in high it just doesn't do it. Is there an after-market unit
or something to resolve this problem?
conditioning. I am having a problem with the AC blower motor; it just
doesn't seem to blow hard enough to cool the inside of the car. It
doe's work in all three speeds but in low and medium it hardly can be
felt, and in high it just doesn't do it. Is there an after-market unit
or something to resolve this problem?
conditioning. I am having a problem with the AC blower motor; it just doesn't seem to blow hard enough to cool the inside of the car. It doe's work in all three speeds but in low and medium it hardly can be felt, and in high it just doesn't do it. Is there an after-market unit or something to resolve this problem?
Burning Brakes
Joined: Sep 2001
Posts: 1,166
Likes: 0
From: Tulsa Ok
Its possible to upgrade the blower motor to a mid-nineties c4 unit but it requires manufacturing a 3/4 to 7/8 in. spacer to accomodate the longer squirrel cage. Several on the board have done this and report much better airflow. I plan to do this mod before it gets too warm this spring.
Intermediate
Joined: Jan 2005
Posts: 32
Likes: 3
From: Rock Spring GA
Originally Posted by FeedVaal
Its possible to upgrade the blower motor to a mid-nineties c4 unit but it requires manufacturing a 3/4 to 7/8 in. spacer to accomodate the longer squirrel cage. Several on the board have done this and report much better airflow. I plan to do this mod before it gets too warm this spring.
Burning Brakes
Joined: Feb 2004
Posts: 958
Likes: 1
From: In the Beautiful Shenandoah Valley of VA
Originally Posted by ftartaglio
I have a 1974, 454 big block coupe with auto trans and air
conditioning. I am having a problem with the AC blower motor; it just
doesn't seem to blow hard enough to cool the inside of the car. It
doe's work in all three speeds but in low and medium it hardly can be
felt, and in high it just doesn't do it. Is there an after-market unit
or something to resolve this problem?
conditioning. I am having a problem with the AC blower motor; it just
doesn't seem to blow hard enough to cool the inside of the car. It
doe's work in all three speeds but in low and medium it hardly can be
felt, and in high it just doesn't do it. Is there an after-market unit
or something to resolve this problem?
Steve
Race Director
Joined: Sep 2002
Posts: 10,362
Likes: 5
From: San Diego - Deep Within The State of CONFUSION!
Originally Posted by Steve's74
You may also be suffering from leakage in the ductwork under the dash. The ducts were assembled with poor to no seals. It is likely that a lot of air is dispersing before it gets to your vents. You should check all of the connections where the plastic pieces fit together.
Steve
Steve
