Blower Motor lacking speed...lol

[425 ponies]

I have a 70 MC & the blower motor does work & when I select the high-speed mode I can tell it is blowing more air. It doesn't blow hard. Is there a different blower motor or some way to increase the airspeed? It is a AC car.

[cny first gen 71]

If I remember correctly on high it's direct current,  the lower speeds a fed through blower resister.  Have you replaced resister or checked it. Is it a new blower motor possible defective?

[Chevy Dave]

I installed a new Four Seasons blower motor from Rock Auto in my 70 A/C car, because of the same issue. The new motor is also slower than I would like. I also wonder if anyone has found a more powerful motor that will work in our cars?

[Scott S.]

I tried something like this years ago on my '77 Silverado shortbox..... I replaced the blower motor with one from a Suburban and found it had a better flow.

 Maybe switching in one from a Chevelle or Impala Wagon might have the same result ?

[Chevy Dave]

A great suggestion, but I researched the part numbers and all Impalas, Chevelles, and Monte Carlo use the same part number. I wonder if the Suburban unit would fit?

[Scott S.]

"IF" the mounting plate has the same pattern, it should..... I'm not sure if the motors can be switched between plates.

Best to check the width of the fan impellor too. A/C cars use a wider version. 

[Scott S.]

Found a couple images that might help....

left is 64-72 chev (fits M.C.)

right is 73-87 G.M.C. (suburban)

[Scott S.]

2 minutes ago, Scott S. said:

Found a couple images that might help....

left is 64-72 chev (fits M.C.)

right is 73-87 G.M.C. (suburban)

O.K..... top and bottom.

[Chevy Dave]

If anyone finds a better motor that will fit, please let us know.

[Scott S.]

Hey Dave....

I think it'll fit, you just have to use the original fan. 

They're easy to swap. 

Scott.

[Chevy Dave]

Scott,

Can you give us a Brand name and part number.