Climate control problems? Read This!

[sly]

do you have an auto setting on the fan switch? if not, your high IS auto. If you have an auto setting, that should be below Low. I don't remember what year they changed that.

[Toploader]

Yes I do:
The fan switch is as follows:
1.Auto
2.Low
3.Med
4.High

Bottom to top.

[sly]

then something is wonky yet. The next question is whether or not it's actually blowing less or being redirected to the defrost or floor.

[Toploader]

What happens is the fan speed slows down, then maybe one minute later resumes on high.......all the while air coming out of the dash panel vents, not on the floor.

then something is wonky yet. The next question is whether or not it's actually blowing less or being redirected to the defrost or floor.

[gadget73]

does it actually slow down, or just get less noisy? If the fresh air / recirc door closes, it gets quieter but doesn't move significantly less air. That will also happen as it gets close to the selected temperature.

[miamibob]

Kinda sounds like normal operation to find the set temp.

[Toploader]

Yes, it actually SLOWS down!.........then, as I said out of the blue, maybe 30 seconds to one minute, it again blows at the high speed.
All the while out of the dash panel vents.

[miamibob]

Is it set to "vent"? Is the proper temp being produced?

[Toploader]

Bob, it is set on panel, and the slider is set to 60 degrees.

Is it set to "vent"? Is the proper temp being produced?

[miamibob]

Exactly where mine is set, on both accounts. Seems to be coming out of the proper place, at least. The fan speeds will change as the temp does so not sure where the problem is??

[sly]

next time it does it... let off the gas and see if it comes back at that moment. If it doesn't come back in short order, then there's definitely an issue with the blower or the wiring going to it. If it does come back immediately, then it's a vacuum issue and there's still a leak somewhere.

[Toploader]

Sly, as I mentioned it slows down regardless of the throttle position! Then is comes back full on in half to one minute. I would assume 30 seconds to maybe one minute would be considered short order? Brand new FoMoCo blower motor and resistor. I know I wasted my money because I had the same issues before I put in the new blower motor and resistor:-( So maybe it it the position of the slide switch after all??

next time it does it... let off the gas and see if it comes back at that moment. If it doesn't come back in short order, then there's definitely an issue with the blower or the wiring going to it. If it does come back immediately, then it's a vacuum issue and there's still a leak somewhere.

[sly]

short order would be 3-5 seconds. Yeah, you probably have an electrical issue. Check the wiring harness to the resistor pack (just down and to the right of the heater core hoses under the hood). Mine went nuclear when I had problems with my fan speeds. Be careful how you pull the harness as those clips can be brittle. I generally use a large flat screwdriver to push the clip off instead of prying it up and over. If everything is still good in those clips and nothing is brown, put some dielectric grease on the female ends and shove it all back together. Do the same with the harness on the blower motor itself. The next check would be the wiring to the climate controls and fan switch. See the attached pics for what mine looked like before replacing both the resistor pack and the harness.

[Toploader]

Sly, everything looks good, no issues! Blower harness is good as well. Why don't you think it could be a slider ATC thermostat issue?

short order would be 3-5 seconds. Yeah, you probably have an electrical issue. Check the wiring harness to the resistor pack (just down and to the right of the heater core hoses under the hood). Mine went nuclear when I had problems with my fan speeds. Be careful how you pull the harness as those clips can be brittle. I generally use a large flat screwdriver to push the clip off instead of prying it up and over. If everything is still good in those clips and nothing is brown, put some dielectric grease on the female ends and shove it all back together. Do the same with the harness on the blower motor itself. The next check would be the wiring to the climate controls and fan switch. See the attached pics for what mine looked like before replacing both the resistor pack and the harness.

[gadget73]

Unlikely. If you aren't using the "auto" position, then nothing in the temperature selection rig has anything to do with fan speed. That stuff only functions when its set to auto. High speed is high speed until the cows come home, or the blower quits. If you haven't, I'd probably unplug and re-connect the blower and the resistor. Inspect the connections while its open. Any green cheese needs to be removed, and I'd put some dielectric grease in the connectors for good measure.