2nd Gen Non-Engine/Transmission A/C blower motor?

[THenningsen]

I've noticed lately that my A/C blower does not put out the same volume of air that I think it used to. If I turn it on max a/c, it lacks power. The air is still cold. Doesn't seem to be much difference between the different power settings. Anyone have any ideas?

 

[THenningsen]

it sounds like it is blowing hard but just doesn't have any output.

 

[JFaughn]

Most cases like you mention , its a stepping resistor , mounted in the air box near the heater core & AC core , haven't done one in that yr , but not too hard , maybe 15 min. , most often 2-3 screws hold it in , a plug with 3-5 wires , when you get out , if its like most , it looks like 3-4 different size springs , one or more may be burnt , or a rust crimp connection , maybe about $15-25 .

 

[Bob4x4]

Most cases like you mention , its a stepping resistor , mounted in the air box near the heater core & AC core , haven't done one in that yr , but not too hard , maybe 15 min. , most often 2-3 screws hold it in , a plug with 3-5 wires , when you get out , if its like most , it looks like 3-4 different size springs , one or more may be burnt , or a rust crimp connection , maybe about $15-25 .

If that were the case he would loose one or more of the speeds,

I have seen some very dirty evap and heater cores that will restrict air flow.



Bob

 

[JFaughn]

I haven't worked on that yr/mod , but I have seen this symptom caused by burned out resistor .

 

[DPapworth]

When a resistor burns out, the intermediate speeds either don't
work, or behave the same as the previous one (too slow).

When a resistor gets shorted out by debris in the heater box,
several intermediate speeds behave the same (too fast).

The wiring is such that at the highest speed, the resistor
is bypassed completely. So if the blower is wimpy AT
FULL SPEED, the issue is not the resistor, but rather
excessive voltage drop on the power or ground side
of the blower, perhaps due to dirty connectors, a
bad blower relay, or a bad dashboard switch.

You can diagnose this by putting the blower on
full and back probing the voltage at the blower motor.
With the blower running, the hot side should be 11. 5 volts or higher,
ground should be 0. 5 volts or lower.

A wiring diagram (factory service manual) helps greatly.

 

[THenningsen]

thanks for the replies... i'm not sure i totally understand what's happening, so where do i begin with the volt meter? should I remove the blower? I am a real novice when it comes to electronics, so any other tips would be great. thanks guys!

 

[THenningsen]

air doesn't blow cold either. Is it worth getting a recharge kit with dye in it? I want my air to blow super cold and have some power to it.

 

[DonTX]

Mine had that same problem, the only thing wrong was that the blower fan was full of leaves and fuzz, and the evap was plugged as well. Pull your blower motor (takes only a couple of minutes) check the fan and reach down inside the hole to see if you are plugged up.

Leaves and trash get down in there from the cowl vent, and can ruin the AC stuff. I got a Geno cowl vent filter when I done mine, don't want it to get that way again.