Blower motor in my car quit last week. It died while driving it, no heat from any setting. Then next day driving to work it comes back on mid-drive and any setting works fine. Been on and off for the last few days. Doesn’t make any strange noises so I’m guessing it’s not the motor itself correct? What does that leave, the relay or something? I checked the fuse and it’s not loose or blown. I’m not that familiar with hvac crap and it’s cold outside haha. It’s a subaru svx btw.
Could be a blown relay. I had to replace my blower motor resistor on my 2000 Prizm a couple months ago since the heat only worked on high setting. Did a quick google search and found these steps:
BLOWER MOTOR DOES NOT OPERATE AT ALL OR IN HIGH SPEED
- 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. - 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, replace fuse. If fuse is okay, repair
open White wire. - Turn ignition and A/C control panel OFF switch to 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. - 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 approximately one volt is present, go
to next step. If approximately one volt is not present, replace auto
amplifier and retest. - 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). - 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. - Remove glove box and disconnect fan control amplifier
connector. Fan control amplifier is located on cooling unit. With
ignition on and AUTO switch in on position, put fan switch in LO or
medium position. - 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. - 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. - Check for 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. - 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 an
open White/Red wire. If White/Red wire is okay, replace auto
amplifier. - Put fan switch in medium or LOW speeds. 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.
get a volt meter, turn it on while its not working, check for voltage at the relay, then you’ll know what part is getting power and what isn’t.
what kind of vehicle? blower motor resistor or something with the motor itself. I have gotten many blower motors to come back for a little bit by whacking them.
.
volt meter the same as a multi-meter?
correct, take the relay out and go from the sockets the relay plugs into, then you can eliminate tie wiring from the issue if you have power everywhere youre supposed to, obviously you’ll need to use a jumper to check power at the blower motor itself to eliminate the factor of the relay.
Sounds good, I’ll give it a look when I get a chance. Thanks for the ideas gentlemen.
if you want some help with it shoot me a pm, i just dealt with doing this in lab a whole semester. lol
You could have a bad/dirty:
- Fan Switch
- Motor plug
- Relay (Not likely)
- Fuse (Not likely)
- Motor (Not likely)
When these motors start acting funny the contacts on the plugs for the motor and the switch usually corrode. Test the system as livin4hockey stated. Clean the contacts with an emery cloth (fingernail emery board) or some 1,000 grit sandpaper. Put a little vaseline on the contacts when you reconnect them.
If you need a hand let me know.
Good luck.