Re: Anyone ever try to fix a heat/AC swtich (in dash)

On Sun, 14 Dec 2008 09:43:15 -0800 (PST), DanKMTB <DanKMTB@xxxxxxxxx>
wrote:

On Dec 13, 6:33 pm, "Rodan" <Ro...@xxxxxxxxxxx> wrote:
"DanKMTB" wrote:                     ( 98 Ranger )

The switch to control heat, defroster, and AC has been on
the way out - the only setting that worked was high.   Now
it has died completely, even high does not work.        Has
anyone tried to fix one of these, or should I just bite the
bullet and replace it.
_____________________________________________

Switches are generally non-repairable.   If your diagnosis
of a bad switch is correct, your only option is to bite the
bullet and replace the switch.

If you would describe the symptoms, someone may have a
different diagnosis.     For example, if the AC compressor
works and the heater core gets warm, and the heater duct
valves work, but the fan is intermittent, the most likely
cause is a burned-out resistor module near the fan motor.

Good luck.

Rodan.

Symptoms are few: The lower 3 speeds stopped working all at once long
ago, and now the high speed does not work either. Hard to tell for
sure if the heater core and AC are working, since it's not blowing any
air at all, but it seems they might be. Allowing the truck to run for
an extended period of time does produce a small amount of heat in the
cab. Can't really use the same test for the AC as it's ~20 degrees F
here. I'm open to any ideas how to check these things.

Jeff's idea about the resistor seems it could be the ticket, based on
some reading I've done since reading his post.

Confirm the blower motor is working. I think you should be able to
hotwire it from the batttery, but there must be somebody here who
knows. I've had the lower speeds go out on GM cars, and just
replacing the blower motor got all right again.
Sorry I don't know electrics enough to say more.

--Vic
.

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