blower not working, but a/c is?!

[jshadwick]

Hi, just wonderin' if anyone knew what i have going on here:
I was running my a/c in my '79 , on Max, when it decided to stop working. The funny thing to me is, I still get cold, air conditioned air, IF I am moving at near freeway speeds, as long as I dont have it on MAX; and it feels like the fan is on the low setting, not too powerful. When I come to a stop, the cold air stops. I am thinking something to do with the blower motor. I know little 'bout this stuff. Any suggestions?
Thankin' y'all in advance
james

 

[Michael]

The blower switches are notorious for going out...do you have any other speed? The switch goes to a relay
out on the A/C box....you might check/replace that. Last but not least, theer is a "resistor" assembly that monts
on the side of the A/C evaporator box. It's held on with 2 screws.....pop it out and take a look. It's just a
couple of resistors that look just like coiled wire.

 

[95 Silverado]

the blower motor harness is found by the A/C box under the hood. check for a loose connection around the relay or the wires going to it.

 

[txbartman]

Your blower is not working. Check the other replies for where the harness is and start checking connections before replacing it. When on MAX, the blower recirculates air from inside the cab. On NORM, it pulls in outside air. So, when you are going down the road on NORM, the air you are feeling is simply being "pushed" in from the outside without help of the blower. When you stop, it stops. If you switch to max and it closes the outside vent, the air probably stops as well.

 

[jshadwick]

yep, y'all hit da nail on the head. at least i have something, till I get around to workin' on it. get mighty warm here in Sacramento.
thanks again
james