Started off on Saturday, went to use the AC during a drive and had no fan speeds on the front system. The rear worked fine. Couldn't do anything about it at the time, as I was on the way out. 5 hours later, on the way home, tried it again for kicks, system worked just fine. First assumption was maybe damaged wires on the resistor pack, to the point of intermittent contact?
Didn't use it for a few days until today. Went to turn it on for the morning commute, and nothing. But on the way home, worked just fine. I had looked up the resistor packs just to see what they looked like, and see the price ranges. Not bad. Get home, and get the sucker out and it looked to be in good shape. Put it back in, decided to test if the fan didn't fire, I would check and see if there was voltage at the pigtail or not. Naturally the blower kicked on at all speeds. For the first few minutes, had some issues with the air output. Air seemed to be blowing out of all vents regardless of the setting. Turned off the fan, and cycled through each vent setting. Could hear each actuator move, sounded smooth, no clicking. Tried the fan again, and the output followed the selections.
So now I'm thinking flaky HVAC control module... Tomorrow if it doesn't blow out of the front again, I'll try setting the rear control to read from the front. If the rear stops working on that setting, I'll be more convinced that it's the control module. Can anyone think of anything else I might be overlooking, or that I could test in the meantime?
Didn't use it for a few days until today. Went to turn it on for the morning commute, and nothing. But on the way home, worked just fine. I had looked up the resistor packs just to see what they looked like, and see the price ranges. Not bad. Get home, and get the sucker out and it looked to be in good shape. Put it back in, decided to test if the fan didn't fire, I would check and see if there was voltage at the pigtail or not. Naturally the blower kicked on at all speeds. For the first few minutes, had some issues with the air output. Air seemed to be blowing out of all vents regardless of the setting. Turned off the fan, and cycled through each vent setting. Could hear each actuator move, sounded smooth, no clicking. Tried the fan again, and the output followed the selections.
So now I'm thinking flaky HVAC control module... Tomorrow if it doesn't blow out of the front again, I'll try setting the rear control to read from the front. If the rear stops working on that setting, I'll be more convinced that it's the control module. Can anyone think of anything else I might be overlooking, or that I could test in the meantime?