AC Blower Motor Slow (Not Blowing Much Volume)...

[PWagon]

I have an '86 K5 Blazer, and my AC blower motor does not blow air as hard (volume/amount) as I remember it doing 20/25 years ago. Plus the cars and trucks of today will blow your hat off your head if you're not careful. So, I'm not sure I have a realistic expectation for my old truck to come close to todays AC systems. Regardless, my truck blows less air than it used to... period.

I just read an article on a different message board where the guys talked about upgrading the stock 80's blower motor to a 1994 Chevy Truck blower motor. Have any of you tried this before? I would not imagine it would fit, but I was wrong before like that time I gave a lot of my money to that t.v. evangelist... And who could forget that time I invested the rest of my money in Enron... And of course in believing Elvis is alive and well and living in a small town outside Las Vegas. I'm still pretty sure I bought 10 gallons of gas, a pack of Marlboro reds, and a box of Chiclets from Elvis at a Stop-n-Go off I-15 about 6 years back. Anyhow, any help on this topic would be appreciated.

 

[454Sub]

Not sure about your area, but field mice, wasps, hornets and the like are bad for building hotels in hvac ducting around here if something sits to long.

 

[paratrooper307]

Check your ducting. The connections can come apart over time, especially if someone has been messing around behind the dash, and you could be losing a lot of air behind there.

It's also a couple decades old, probably getting a little tired, just like electric windows do. I imagine there are a variety of motors that could fit, depending on the level of modification you are willing to do.

 

[Greg Ducato]

I swapped to the later motor and cage, changed the relay, ran a bigger wire to the relay, put an additional ground from motor to body and still found my biggest improvement sealing the ducts and adjusting the blend door.

 

[Keitha]

I recomend just start taking it apart to asses what is going on. It really could be a number of things that cause the poor airflow. The ducting, as mentioned, is one. Pull the blower motor and inspect the fan - I bet it is caked with dirt. Look at the wiring...