SOURCE: 2006 Trailblazer AC fan
chk fan speed resistors in evaporator houding under the hood where the blower is mounted. Tewo scewa hold them in You can see the wires.
SOURCE: air conditioner
Possible solution for susuns: turns out my problem was an improper freon charge. If your problem is the same as mine your a/c cools very well, but stops blowing air after about 20 minutes. If so, your evaporator core is freezing over and the ice is blocking air flow. Also after parking the truck water will continue to drip from the truck for a long time. To test this theory next time it occurs, switch the selector to vent and the fan to high. You should notice the air flow return within 5-10 minutes or less, however the air will still be quite cold due to the ice formed on the core. If all this fits your situation, take your truck to an experienced technician and have the freon pressures checked. My system needed to be charged a little on the high side to prevent the freezing up.
Hope this helps, capn0623
SOURCE: 2004 Colorado Air Conditioner/Heater Blows on Full Power Only
replace the blower motor speed control resistor, it is the only thing that will cause this.
SOURCE: 1996 impala ss air conditioner compressor is very noisy
That clutch and coil are serviceable without replacing the compressor but I have had little success with this as usually the clutch gets in that shape subsequently from activity going on inside the compressor which means that clutch is failed generally for a reason.replace the compressor -orfice tube-reciever drier and happy motoring......
SOURCE: The AC blows on #4 fan setting but doesn't blow at all on 1-3
That is the blower resistor. 4 is wide open, so, no resistance. I had 4 of them put into my truck. The wires were burnt and shorted the others until the problem was found. Check the plug if you do this yourself.
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