heater fans not working
 

For no apparent reason, the heater/AC fan inside the car is gone. The auto- vent- fanspeed- lites all lite up as usual and I can hear soft clicks from near the glove box as the buttons are pushed. The A/C pump starts and stops, and the radiator fans come on and off normally with the Auto setting. All fuses in the entire car are fine. I did a search and only found that someone was able to make the fan come back on with a smack to the glove box area, but no result for me! Any suggestions as to what to consider next? Is there a relay somewhere dead, or internal fan fuse?
The fan was making no signs of distress prior to quitting, the only thing new was an A/C recharge about 2 weeks prior to the fan quitting.

Thanks!

Rob

there's lots to check. To make your life a little easier, I cut & pasted from the climate PDF on Reaper's site:

BLOWER MOTOR DOES NOT OPERATE AT ALL OR IN HIGH SPEED
1) With ignition off, measure voltage between terminal No. 2
(Red wire) of off relay connector and ground. Off relay is located on
blower motor unit. If battery voltage is present, go to next step. If
battery voltage is not present, check fuses No. 20 and 21. Replace
fuses as necessary. If fuses are okay, repair open Red wire.
2) With ignition on, measure voltage between terminal No. 1
(White wire) of off relay connector and ground. If battery voltage is
present, go to next step. If battery voltage is not present, check
fuse No. 15. If fuse is blown, repair short circuit and replace fuse.
If fuse is okay, repair open White wire.
3) Turn ignition switch and A/C control panel OFF switch to
the on position. Measure voltage between terminal No. 3 (Blue wire) of
off relay connector and ground. If battery voltage is present, go to
next step. If battery voltage is not present, check for open Blue wire
between terminal No. 3 of off relay connector and terminal No. 12 of
auto amplifier 16-pin connector. Repair wiring as necessary. If Blue
wire is okay, replace auto amplifier and retest.
4) Put AUTO switch in on position and fan switch in HI
position. Measure voltage between terminal No. 3 (Blue wire) of off
relay connector and ground. If voltage is about one volt, go to next
step. If voltage is not approximately one volt, replace auto amplifier
and retest.
5) Disconnect 2-pin blower motor connector. Turn ignition on.
Put AUTO switch in on position and fan switch in HI position. Measure
voltage between terminal No. 1 (Red/Black wire) of blower motor
connector and ground. If battery voltage is present, go to step 7).
6) If battery voltage is not present, check Red/Black wire
between terminal No. 1 of blower motor connector and terminal No. 4 of
off relay connector. Repair wiring as necessary. If Red/Black wire is
okay, replace off relay.
7) Remove glove box, and disconnect fan control amplifier
connector. Fan control amplifier is located on cooling unit. With
ignition switch and AUTO switch in the on position, put fan switch in
LO or medium position.
8) Measure voltage between terminal No. 2 (Black/Red wire) of
hi relay connector and ground. If battery voltage is not present,
check for open Black/Red wire. If Black/Red wire is okay, replace
blower motor.
9) If battery voltage is present, measure voltage between
terminal No. 1 (White wire) of hi relay connector and ground. If
battery voltage is not present, repair open White wire. If voltage is
present, disconnect hi relay connector.
10) Check continuity between terminal No. 4 (Black wire) of
hi relay connector and ground. If no continuity exists, repair open
Black wire. If continuity exists, reconnect hi relay connector and go
to next step.
11) Ensure ignition is on. Put AUTO switch in on position.
Put fan switch in HI position. Measure voltage between terminal No. 3
(White/Red wire) of hi relay connector and ground. If one volt is
present, go to next step. If one volt is not present, check for open
White/Red wire. If White/Red wire is okay, replace auto amplifier.
12) Put fan switch in medium or LOW speed position. Measure
voltage between terminal No. 3 (White/Red wire) of hi relay connector
and ground. If battery voltage is present, replace hi relay. If
battery voltage is not present, replace auto amplifier.

Heater fan
 

Hi Lee

Thanks for the reply! I went thru that list in order and found that the auto amplifier was shot, and probably the reason it was, is that the motor was very hard to turn. Upon inspection, the armature copper contacts were worn to the point of being gone in a couple places!! New auto amplifier is $ 82 and fan motor is $152 , so I'm trying to find a used motor,

This car has 299,450 miles on it and I estimate the fan has run about 6000 hours. So that's a data point for fan life!!


Sleepem

For what it's worth.... The blower motor dies in our 91 legacy and I clean-up the armature in a drill with a file and cleaned out the slots. It's been working great since then but now the tranny isn't working.:rolleyes: I was surprised at how thick the comutators are.