Check your cabin air filter and see if it is plugged way up. These cost about 20 dollars to replace.
SOURCE: Fan switch speed does not change from speed 2 to speed 3
it is all in the switch, it should only be a few bucks at a parts store and all you have to do is pop the the dash off and replace that switch.
SOURCE: heater wont blow warm/hot air
check your radiator coolant, thats what I did and it blows warm again
SOURCE: 2005 Pontiac Montana SV6 heater blows cold when slowing to idle
How cold is it there and does your engine cool down any while going slow? If it does it may mean you need a hotter thermostat installed, My first thought would be to check the coolant level in the radiator and the coolant reservoir! Hope this helps and Merry Christmas
SOURCE: volume of air coming from a/c ducts is very slight
sounds like a bad blower resistor-thats why you have no speeds 1,2 or 3. the resistor will either be near the blower motor(the squirrel cage u spoke about) OR under the dash on the passenger side just above wher the passengers feet would be.it will have usually 2 screws holding it in and wires going to it.
SOURCE: fan is okay on heater but no warm air coming out.
Could be the valve that controls hot water to the heater core or the heater core its self try flushing the cooling system 1st if that doesn't
help the control wire to the valve may have come loose at the valve or the back of the heat control
hope this helps
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