1995 Z24 - has always had Ice cold A/C. A few weeks ago while driving and using the A/C, air stopped blowing out (wasn't coming out of any vents at all - floor, defroster, etc). It randomly started working again approximately two minutes later at 100% - cold air, blowing out at it's regular speed.
Since then, the intermittent problem became progressively worse until it didn't work more often than it did. I did some research and learned that the Blower Motor Resistor goes out fairly frequently on my model of car, but the symptoms don't seem to match. Everyone with a bad resistor says that it still works, but only at certain fan speeds (high but not low, or vice versa), but mine not does not blow at all. I decided to replace the blower motor itself. Got the new motor installed and tested it out. It now blows, but very softly -- the highest fan speed setting is a little softer than what used to be "low".
Some facts to help anyone who might be able to assist me in diagnosing the problem:
-The fan does change speeds when you move the dial -- definitely four distinct speeds,
- The little air that does make it out the vents is ice cold.
- The air does come out where you tell it to (if the dial is set to defrost, floor, mix, etc., it comes out the appropriate vents.
-Before I replaced the motor, sometimes going over a pothole or rough patch of road would bring it back to life for a few seconds.
Any help would be greatly appreciated. I live in Phoenix, and it is HOT.
Sounds like your original problem may have just been a loose connection. Your new problem sounds like the blower is the wrong type or you have miswired it somehow.
I'll second that, check the motor for wrong rotation. Remove motor and turn on fan, it should be turning toward the blade edge, and you will feel lots of air.
I have a 97' Sunfire GT and mine only blows on the 2 high speeds. The bottom 2 speeds dont work at all.
I went through almost the same thing, but I didn't go as far as to change the blower.
Are you sure the new motor is actually on? The small amount of air that is blowing in might be just from the movement of the car.
Have you checked the HVAC relay under the hood? It is the same relay as the engine cooling fan relay. Try switching the relays and see if that fixes the problem. I suspect that the relay might be on the way out, sticking sometimes, not switching at all other times. This may why the problem is intermittent. (this was my problem)
And of course, don't forget to check the fuse.
Chris sounds like your Blower Motor Resistor went.
98 Z24
RIP Specks
or the motor went out , or the connection at the resistor or fan is loose and causing problems
How about that the actual a/c control switches are worn out. On our GM vehicles for work, Tahoes and K-1500 the a/c control wear out, sometimes we only get high and thats it. We have been told by the mechanics that its the a/c control switches are worn. In a pick up truck that runs about 180 new, in a cavalier i don;t know. U could try a junkyard, i bought one for about 40 bucks. Get the same year as your vehicle.
