2020-B1-5

Author Topic: Low output air flow from heater blower motor in 1979 Trans Am  (Read 306 times)

NITEBIRD

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Low output air flow from heater blower motor in 1979 Trans Am
« on: January 09, 2020, 12:25:08 AM »
My factory 1979 Trans Am SE 400 4speed also came with factory A/C and 4 wheel disc if that makes any difference when discussing this topic.

I had removed the entire heater box,cleaned it,applied new seals and made sure the vacuum canisters were working properly opening the doors.

I compared the factory heater blower motor which was still working with the new blower motor I purchased from Autozone which was PM102 and both of them seemed to blow the same amount of air as I used the factory blower wheel on the new blower motor and installed it.

When I installed the heater box and ductwork back into the car I tried to make sure they fit snug and when running the AC I dont feel any major leaks anywhere.

I dont think the factory type blower motors for the 1970-1979 Trans Ams push enough air and I am wondering if anybody else has used any other blower motors to try and get more flow?

I have noticed that the same blower motor PM102 was also used in alot of other cars and trucks from 1968 to 1979 as the same blower motor is used in my 1968 Chevy C10 shortbed fleetside with factory 396 and 400 turbo trans.

gm muscle

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Re: Low output air flow from heater blower motor in 1979 Trans Am
« Reply #1 on: January 10, 2020, 09:45:07 PM »
I've wondered this as well. The air output is but a fraction of what modern blowers put out. I also replaced the original blower motor with an Autozone unit...complete crap! I had to remove the inner fender again to replace a non functioning blower motor...this time with an AC Delco motor.
1977 Trans Am stroked 400 (468)
1989 Iroc-Z28 5.7 TPI 90K original miles
1987 Monte Carlo SS LS 2/4L65e
1997 Silverado 5.7 Z71 Single Cab, Short box (daily driver)

Re: Low output air flow from heater blower motor in 1979 Trans Am
« Reply #1 on: January 10, 2020, 09:45:07 PM »
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