I need some help with my 98 blazer,
the heater blows but not on high, it just stops blowing.
I checked the two wire at the blower motor and there is juice when on the lowest speed settings but when turned to the highest blower speed the juice stops.
Thanks

 

A few months ago my heat/ac started making some loud noises. So I had it taken in and it seemed to be the heater coil and blower motor. After I got it back, I didnt notice initially, but high did not work. So its back in the shop now and they are saying its the blower motor relay. Not sure if this will help, but its worth a shot.

 

Thanks, I read it might be the blower relay. Can someone help me with a location and discription of this relay?

 

Having Same problem Jimmyone. I installed a new blower resistor unit, didn`t fix the problem. There must be a high speed blower relay just for the high setting. I have a 99 S10, from what Ive researched online the relay is probably under dash behind glove box. I have not confirmed this yet, as it has been around 0` here in rochester.