Hi - I have a 90 Bonneville and a 89 Olds 88 Royale - both presumably
have the same wiring and circuitry, so I thought I would post to both
groups and general GM group.

This car came from a family member in PA. When we got it three years
ago, the fan switch only worked on "high" so we left it alone. The
other day the fan totally died no matter what position the fan switch
was on.

According to the wiring diagram, the blower swtich runs through a relay
and a resistor for the "low" and "medium" settings, and directly from
switch to fan on "high".

I pulled the fan out of the heater box, and hooked it directly to the
battery - it worked fine. This left the blower switch, relay or
resistor. I replaced the switch, and the motor works on "high" only.
Back to where I originally was.

The parts guy at a local Pontiac dealer says that the relay is one of
either two types, and I need to get the part number off of it to let him
know. But his parts listing doesn't give the specific location of
either the relay or the resistor.

I need to locate the AC/vent blower motor resistor and the blower relay.
All the Haynes and Chilton books refer only to general locations -
that the fan relay is either under the hood over the blower motor or
under the dash at the fuse panel over the driver's feet or behind the
glove box on the passenger side. I have looked and the blower relays
are not in any of those positions.

I traced the wires from the blower switch under the dash to a wiring
block back up behind the vent to the immediate right of the steering
wheel, and from there is looks like it goes up to the left of the
steering wheel and then I can't see it unless I pull the whole dash
apart. From the blower motor, the wires go up under a red power
connector and then under a couple of relays (not the blower fan ones)
and then into a power block on the upper firewall on the passenger side.

I checked the fuse and relay block right behind the glove box, and there
are two relays plugged in right now - but they are not the right part
number - they run the fuel pump and one other item. So I presume that
the relay and resistor for the fan blower motor are someplace up under
the dash, but I would prefer not to tear the whole thing apart to find it.

So does anyone know the SPECIFIC location of the blower motor resistor
and the relay? Please, do not tell me the general area based on your
perusal of the manual - I want the specific location. That means I
would prefer to hear from someone who has actually done this sort of
repair before and knows exactly where the two parts are located.

Please respond via the newsgroup - thanks!

"usenet" <usenetreader1234@earthlink.net> wrote in message
news:UOhIg.1985$xQ1.1296@newsread3.news.pas.earthl ink.net...
> Hi - I have a 90 Bonneville and a 89 Olds 88 Royale - both presumably
> have the same wiring and circuitry, so I thought I would post to both
> groups and general GM group.
>

>
> So does anyone know the SPECIFIC location of the blower motor resistor
> and the relay? Please, do not tell me the general area based on your
> perusal of the manual - I want the specific location. That means I
> would prefer to hear from someone who has actually done this sort of
> repair before and knows exactly where the two parts are located.
>
> Please respond via the newsgroup - thanks!

The resistor pack is located in the air plenum behind the blower motor -
towards the firewall, in the passenger's footwell. You'll probably have to
remove a trim panel under the glove box to see it. Google this newsgroup
and you'll find a lot of stuff that has been posted about finding it and
replacing it.

--

-Mike-
mmarlowREMOVE@alltel.net

usenet <usenetreader1234@earthlink.net> wrote:

>Hi - I have a 90 Bonneville and a 89 Olds 88 Royale - both presumably
>have the same wiring and circuitry, so I thought I would post to both
>groups and general GM group.
>
>This car came from a family member in PA. When we got it three years
>ago, the fan switch only worked on "high" so we left it alone. The
>other day the fan totally died no matter what position the fan switch
>was on.
>
>According to the wiring diagram, the blower swtich runs through a relay
>and a resistor for the "low" and "medium" settings, and directly from
>switch to fan on "high".
>
>I pulled the fan out of the heater box, and hooked it directly to the
>battery - it worked fine. This left the blower switch, relay or
>resistor. I replaced the switch, and the motor works on "high" only.
>Back to where I originally was.
>
>The parts guy at a local Pontiac dealer says that the relay is one of
>either two types, and I need to get the part number off of it to let him
>know. But his parts listing doesn't give the specific location of
>either the relay or the resistor.
>
>I need to locate the AC/vent blower motor resistor and the blower relay.
> All the Haynes and Chilton books refer only to general locations -
>that the fan relay is either under the hood over the blower motor or
>under the dash at the fuse panel over the driver's feet or behind the
>glove box on the passenger side. I have looked and the blower relays
>are not in any of those positions.
>
>I traced the wires from the blower switch under the dash to a wiring
>block back up behind the vent to the immediate right of the steering
>wheel, and from there is looks like it goes up to the left of the
>steering wheel and then I can't see it unless I pull the whole dash
>apart. From the blower motor, the wires go up under a red power
>connector and then under a couple of relays (not the blower fan ones)
>and then into a power block on the upper firewall on the passenger side.
>
>I checked the fuse and relay block right behind the glove box, and there
>are two relays plugged in right now - but they are not the right part
>number - they run the fuel pump and one other item. So I presume that
>the relay and resistor for the fan blower motor are someplace up under
>the dash, but I would prefer not to tear the whole thing apart to find it.
>
>So does anyone know the SPECIFIC location of the blower motor resistor
>and the relay? Please, do not tell me the general area based on your
>perusal of the manual - I want the specific location. That means I
>would prefer to hear from someone who has actually done this sort of
>repair before and knows exactly where the two parts are located.
>
>Please respond via the newsgroup - thanks!

#1 - if the blower works on high speed, the relay is absolved of
blame. The ONLY function of the blower relay is to provide direct
battery feed to the blower motor when HI speed is selected (bypassing
the resistor unit).

#2 - you'll find the resistor unit on both cars (all 86~91 "H" body
cars use the same HVAC module parts except for the air distribution
ducts in the car) on the blower motor housing in the engine
compartment.

Remove the plastic cover that is above the blower motor (one nut is to
the passenger side of the vacuum tank, the other is in the corner of
the engine compartment). You'll see the connector for the resistor
unit just above and to the passenger side of the blower motor. It is
held into the air plenum (for cooling) by 2 6 or 7 MM screws.

Regards,
Bill Bowen
Sacramento, CA