03 Grand Prix GT - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Pontiac When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 04-23-2007, 02:55 PM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Feb 2007
Location: Wisconsin
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
imbuddha is on a distinguished road
Default 03 Grand Prix GT

Hi all i have a quick quesstion, my blower motor only works on settings 3,4,5.
not on 1,2. the old GM'* had a seperate fuse for the hi fan setting, is the late model grand prix the same way or is this a problem with the switch.thanks for any and all help.

DENNIS
imbuddha is offline   Reply With Quote
Old 04-23-2007, 03:32 PM   #2
Junior Member
 
Join Date: Mar 2003
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
vital49 is on a distinguished road
Default

It'* a problem either with the switch, or with the printed circuit board that the wiring harness plugs into.

I'm not sure how to deceipher which is bad. A gearhead will be able to tell you that soon.
vital49 is offline   Reply With Quote
Old 04-23-2007, 03:36 PM   #3
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Hmmm

My first thought would be a resistor for the various speeds...but really not sure.
BillBoost37 is offline   Reply With Quote
Old 04-23-2007, 04:21 PM   #4
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37
Hmmm

My first thought would be a resistor for the various speeds...but really not sure.
Almost the same thoughts here..

For speeds 1-4 there should be a set of resistors for the speed settings... IIRC the High speed seting should be controlled via a relay... and this if the W Body is similar to the H and C body GM'* which I think it should be..

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 04-23-2007, 04:28 PM   #5
Senior Member
True Car Nut
 
Join Date: Jul 2004
Location: Grand Rapids, Mi
Posts: 5,656
Thanks: 0
Thanked 0 Times in 0 Posts
Archon is on a distinguished road
Default

This is the description of operation for your year. I'd agree that it sounds like a resistor or two may have opened.

Quote:
The HVAC control assembly applies voltage to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:

* Low speed: 4 resistors
* Medium 1 speed: 3 resistors
* Medium 2 speed: 2 resistors
* Medium 3 speed: 1 resistor

When the operator requests High speed, the HVAC control assembly applies voltage to the blower motor relay through the high blower motor control circuit. The voltage energizes the blower motor relay, connecting the blower motor to battery positive voltage.
Low Blower Speed

When the Low blower speed is selected, the HVAC control module applies voltage to the blower motor resistors through the low blower motor control circuit. Voltage is decreased across 4 series resistors to achieve the desired blower speed. The blower motor is grounded through the blower motor resistor assembly and ground circuit of the blower motor resistor assembly.
Medium Blower Speeds

When the Medium 1 blower speed is selected, the HVAC control module applies voltage to the blower motor resistors through the medium 1 blower motor control circuit. Voltage is decreased across 3 series resistors to achieve the desired blower speed. The blower motor is grounded through the blower motor resistor assembly and ground circuit of the blower motor resistor assembly.

When the Medium 2 blower speed is selected, the HVAC control module applies voltage to the blower motor resistors through the medium 2 blower motor control circuit. Voltage is decreased across 2 series resistors to achieve the desired blower speed. The blower motor is grounded through the blower motor resistor assembly and ground circuit of the blower motor resistor assembly.

When the Medium 3 blower speed is selected, the HVAC control module applies voltage to the blower motor resistors through the medium 3 blower motor control circuit. Voltage is decreased across a resistor to achieve the desired blower speed. The blower motor is grounded through the blower motor resistor assembly and ground circuit of the blower motor resistor assembly.
High Blower Speed

When the High blower speed is selected, the HVAC control module applies voltage to the blower motor relay through the high blower motor control circuit. The blower motor relay is internal to the blower motor resistor assembly. The voltage energizes the blower motor relay, causing the blower motor to be connected to the battery positive voltage circuit. The blower motor is grounded through the blower motor resistor assembly and ground circuit of the blower motor resistor assembly.
Off Mode

When the OFF position is selected, the HVAC control module applies voltage to the off blower motor control within the HVAC control module through the off blower motor control circuit. When the HVAC control module receives this input, any A/C request will be cancelled and the A/C request LED will turn off. Fresh air will still be brought in from the outside.
Archon is offline   Reply With Quote
Old 05-20-2007, 02:31 AM   #6
Senior Member
Posts like a 4 Banger
 
Join Date: Apr 2007
Location: Chicago (Elgin), IL
Posts: 133
Thanks: 0
Thanked 0 Times in 0 Posts
CMNTMXR57 is on a distinguished road
Default

Blower Motor resistor. Common problem on GM vehicles.
CMNTMXR57 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Bonneville, Grand Prix, Grand Am, Monte Carlos...... stb4224 General GM Chat 6 11-20-2005 06:36 PM
The Grand Prix GPX? SSEiDu General GM Chat 8 02-24-2004 11:47 PM
Steering rack/ratio vs. the Grand Prix for quicker steering. brminder 1992-1999 16 03-14-2003 04:23 PM
'00 SSEi vs. '02 Grand Prix GTP SOLID General GM Chat 4 03-11-2003 12:18 AM
93 se vs. early 90's grand prix Delirious0413 General GM Chat 3 12-28-2002 11:59 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:21 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.