I have a 2001 Chevy Blazer that use to only blow heat or AC on #4 only. But recently it stopped all together. Now the only air I receive is forced air while I'm driving. Now I've replaced the resister, the blower motor (which wasn't fun by the way lol) as well as the fuses & the fuses behind the switches. I'm still not getting anything. Can someone give me any ideas on what else is wrong. I live in Michigan and have 3 children one of them is only 18 months old and winter is slowly approaching. HELP PLEASE!!!

 

i would guess either the relay or the HVAC controls themselves

 

I've changed both of those already... Thats why I'm so confused....

 

Just to double check you replaced the relay (mounted to the firewall right above the blower motor) AND the resistor (have to cut it out to the right of the blower motor)? Because my friend had a similar issue with his blazer (only high fan) and we changed his resistor and it was perfect on all settings again.
And have you checked to see if your getting power to the blower motor and/or resistor?

 

I have an issue like this, part source said it would be the resistor so I bought nd replaced it and still nothing blowing on any setting, what to do, please help

 

Fisherdave, I would start by checking your HVAC fuses. If are all good, test the power to the blower motor, if there's no power going to it on any setting then there is possibly a brake in a wire, if there is power going to it but it's not blowing then the blower motor is probly shot and needs to be replaced.

 

This is a good situation for a power probe.