HVAC / Blower motor replacement 69 - Impala Tech
Heating & Cooling Heating, cooling & air conditioning

 
LinkBack Thread Tools
post #1 of 5 (permalink) Old 12-30-2019, 02:11 AM Thread Starter
 
 
Join Date: Sep 2019
Posts: 15
 
HVAC / Blower motor replacement 69

I am looking for info about the blower motors for 69 Impala with A/C

I want to replace mine since I have the front end of the car disassembled and the wiring seemed to be really sketchy.
The OEM switch wasn't in use and was replaced by a selector knob on the dash. I plan on using some sort PWM circuit to control the speed to reduce the strain on the alternator.

But which motor to buy? I know most should run using PWM just fine but if there is some model that is better for it all the better.

Summit only lists one blower motor for a 69 and it says that it's for a non A/C and the airflow might not be enough?

Any suggestions welcome

69 Impala Convertible - It's not perfect, but it's mine https://www.instagram.com/stedisgarage/
Stedi is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 12-30-2019, 07:33 AM
Senior Member
 
Join Date: Jan 2018
Location: Greenville, SC
Posts: 384
 
Rock Auto has them, although they don't differentiate between A/C and non - A/C blower motors, so they might work for either:

https://www.rockauto.com/en/catalog/...r+conditioning

1968 Impala SS
496 Stroker
T56 Conversion
3.73 Posi-Trac
68WASAGOODYEAR is offline  
post #3 of 5 (permalink) Old 12-30-2019, 12:06 PM
Moderator
 
Join Date: Jan 2006
Posts: 12,751
 
Quote:
Originally Posted by 68WASAGOODYEAR View Post
Rock Auto has them, although they don't differentiate between A/C and non - A/C blower motors, so they might work for either:

https://www.rockauto.com/en/catalog/...r+conditioning
They work with any permanent magnet DC motor. A Pulse-Width Modulation control circuit uses transistors to create the top half only of a sine wave consisting of rectangular to square pulses of fixed amplitude, but variable frequency. The fixed amplitude is important because as the speed slows the motor's torque remains constant. You can get the same results with a DC motor as you would with a Rheostat (infinite speed selection by controlling the voltage); without the heat dissipation issues and resulting power loss.

So why didn't the factory use this system rather than a selector switch and three choices of resistor values to control the fan speed? Because when this car was designed transistors were still a military secret used only in the F-104 Star Fighter's avionics. Boy was the Pentagon ****ed when Japan introduced the transistor radio to an unsuspecting world. Even though Bell labs had published a scientific paper on Transistors that they invented in 1947 and received the Nobel prize for doing so in 1956: no one saw an application for such small power rated electrical switches. Too this day vacuum tubes are used in broadcasting because of the transistor's inherent limitations of being able to handle lots of power.

There was a time in my life when letting anyone know you were an engineer meant that you got invited over to their house to fix their TV set or vacuum tube radio (yeah I'm that old).

Big Dave
Big Dave is offline  
 
post #4 of 5 (permalink) Old 12-30-2019, 08:13 PM Thread Starter
 
 
Join Date: Sep 2019
Posts: 15
 
Quote:
Originally Posted by 68WASAGOODYEAR View Post
Rock Auto has them, although they don't differentiate between A/C and non - A/C blower motors, so they might work for either:

https://www.rockauto.com/en/catalog/...r+conditioning
Yea thanks! Any ideas where to get the fan wheel? I think plastic would be better, or maybe aluminum?

I might as well get a new heater core in there since it is pretty cheap, any ideas what is the best one?

69 Impala Convertible - It's not perfect, but it's mine https://www.instagram.com/stedisgarage/
Stedi is offline  
post #5 of 5 (permalink) Old 12-31-2019, 06:01 PM
Senior Member
 
Join Date: Jan 2018
Location: Greenville, SC
Posts: 384
 
Quote:
Originally Posted by Stedi View Post
Quote:
Originally Posted by 68WASAGOODYEAR View Post
Rock Auto has them, although they don't differentiate between A/C and non - A/C blower motors, so they might work for either:

https://www.rockauto.com/en/catalog/...r+conditioning


Yea thanks! Any ideas where to get the fan wheel? I think plastic would be better, or maybe aluminum?

I might as well get a new heater core in there since it is pretty cheap, any ideas what is the best one?
I had to reuse the fan wheel from mine as they are not reproduced for a '68 (and I'm guessing they aren't for a '69 either). I just cleaned it up a little and it was fine. If yours is missing or damaged you might have to hunt one down - try eBay. As far as the heater core goes, I went with the Spectra Premium and it's been fine. It certainly blows hot air.

1968 Impala SS
496 Stroker
T56 Conversion
3.73 Posi-Trac
68WASAGOODYEAR is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Impala Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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

 
For the best viewing experience please update your browser to Google Chrome