A little while back my climate system stopped blowing with the power it once had so I took it into my local shop and the found the blower motor died after they replaced the fan worked for a little while and now it’s once again not blowing with a strong force however it’s still hot air coming out of the vents and if I change it to bring air through the engine bay that still works and it changes modes no issue I’ve checked all the actuators and they all move in and out as I change the positions and I can hear the speed of the fan change when I adjust it and the door opens from the cab to the fan when it’s set to circulate in not sure if one of the internal doors broke or what has happened but if there is a easy way to check if that’s the issue or if anyone else knows what might be causing it help would be greatly appreciated as I live in Canada and it is very cold here right now

 

A couple things to check:

• The vacuum hoses that supply the HVAC actuators can leak so that the actuators do not always move properly or sufficiently far. The amount of vacuum supplied by the engine can affect this. Fro example, when accelerating up a hill, from where the air is blowing might change. And one of the doors that directs the air through the system to adjust the temperature is also vacuum actuated.
• Could your inlet to your HVAC system be plugged? My Blazer lives under a bunch of larch trees and the face of the AC evaporator was half-covered with needles.

 

When you say Inlet do you mean like open the access panel that’s in the engine bay or is there something else I have only had my blazer for about 6 months and don’t really know to much about everything on it

 

This can only be reached by removing the blower motor or if you have a computer climate controled HVAC system by removing a the solid state temperature sensor module.

I can post a picture later that shows this.

But maybe someone else might have some other ideas to try.

 

In this picture, the hole for the blower motor is on the left. In the middle is where the solid state temperature control module would be attached. As you can see the volume behind it was packed with needles and small leaves. This volume is where the air travels to the inlet side of the AC evaporator that is located to the right and identified by the green squiggly line. Once through the AC evaporator, the air is directed across the heater core. The amount of air flow across the heater core is controlled by an electronically controlled "blend door actuator" but also a bypass door that is vacuum actuated.

I hope this helps.

 

I’m assuming all of that is with the rest of the climate stuff in the back passenger side of the engine bay because I did open up that piece that’s meant to be opens for service and it was clean as could be and just to make sure I blew it out just to see if there was dust
also if anyone knows what the direction the blower motor is supposed to turn my other thought is that maybe the shop that replaced put one in that turns the wrong way for my vehicle okay I found what your picture shows took it off and it was all clean I also found out I was about 3 litres low on coolant so I filled my rad up that didn’t make any difference and well I was doing that also checked to make sure the heater core is doesn’t have a block in it both houses were hot