Question about 2002 Pontiac Montana

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2002 pontiac montana. where are the relays for the hvac blowers. the front and rear blowers dont work I have already replaced the resisitor in the front blower. there are some relays behind the glove box on the right side of the dash on the side and I have already checked them or what else could be the cause? I have replace the circuit breaker in the fuse box in the cab and checked fuses inside and under the hood. the blowers work sometimes which makes me think it is a relay but can't find them. they are not behind the heater and ac controls either any ideas?

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  • Randy Kruid
    Randy Kruid Aug 11, 2013

    The new ignition switch fixed the problem

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  • Pontiac Master
  • 5,332 Answers

I think these two problems have a common solution. When they do not work check for power at the HVAC Blower Fuse in the instrument panel fuse block. Check this with a volt meter. You should see battery voltage at the fuse. If you see no voltage or very little than I would bet you have a bad ignition switch. The switch is what supplies power to the fuse.

Posted on Jul 22, 2013

  • 10 more comments 
  • Randy Kruid
    Randy Kruid Jul 22, 2013

    I think if it was the ignition switch there wouldn't be power to the radio or the rear wiper or fog lamps. Also when the blowers quit the other hvac controls don't work either. At the parts store they have 2 relays for the hvac but I cannot find there location I think it acts like a weak relay

  • Randy Kruid
    Randy Kruid Jul 22, 2013

    I think if it was the ignition switch there wouldn't be power to the radio or the rear wiper or fog lamps. Also when the blowers quit the other hvac controls don't work either. At the parts store they have 2 relays for the hvac but I cannot find there location I think it acts like a weak relay

  • Jeremy W.
    Jeremy W. Jul 22, 2013

    Yes you ar partially correct. There are several circuits that the ignition switch is responsible for. One of them feeds power to just three fuses. The DRL/HVAC/HTD fuse, the front HVAC fuse and the rear HVAC fuse. If this circuit burns up in the switch you will have no power to these three fuses but continue to have power to the rest of the vehicle.

  • Jeremy W.
    Jeremy W. Jul 22, 2013

    Check for power at those fuses. They are fed by the ignition switch. There are no relays between the ignition switch and the fuse. If there is no power than the ignition switch is the issue. It's pretty common on GM models.

  • Randy Kruid
    Randy Kruid Jul 22, 2013

    Ok I was wondering if there were several accessory circuits controlled by the ignition. I will check for power at the fuses also would the ignition switch be located down on the steering colum? Since the key is in the steering colum

  • Jeremy W.
    Jeremy W. Jul 22, 2013

    The ignition switch will be on the other side of the column from where you insert the key. Once you drop the column covers you will see it on the left side of the column. I can get ou the wire colors to check at the switch if you need them.

  • Randy Kruid
    Randy Kruid Jul 28, 2013

    Thanks for your help I checked the fuse yesterday and no power to the fuse but there is power to the circut breaker I didnt have a lot of time to work on it. Its my daughters van and she lives 30 miles from me and also in the process of moving her I will get a chance maybey sometime this week and I should have be able to work on it next weekend I also should remove the hvac control panel and see if there is any power there because there may be a chance its the control panel circuts but I should check the ignition switch 1st. why would there be power at the breaker but not at the fuse?

  • Jeremy W.
    Jeremy W. Jul 28, 2013

    What breaker? There's not a circuit breaker on those circuits. I'm not sure you are sure of what you are checking. If there is no power at those three fuses and since power has to go through those three fuses to get tot the control head, why would you think there would be power at the control head?

  • Jeremy W.
    Jeremy W. Jul 28, 2013

    I think it would be a good idea to swing buy the library and get a copy of the wiring diagram for the HVAC circuit. Also one for power distribution. Most libraries have a free automotive database that you can get all this info for the cost of the printing paper. This is not a hard diagnosis and would take an experienced tech maybe 20 minutes tops to figure out. You need to go to the ignition switch and see if the wire for the HVAC supply circuit has power. If it does not replace the ignition switch. It's that simple.

  • Randy Kruid
    Randy Kruid Aug 11, 2013

    There is a 30 amp breaker labled FRT HVAC BLWR thata why I wanted to check for power at the control panel no power at the fuses I did put a new ignition switch in and it fixed the problem Thanks

  • Jeremy W.
    Jeremy W. Aug 11, 2013

    Sweet!

  • Anonymous Nov 06, 2013

    I don't want these problems to happen to me. Where is a great place to learn aboutHVAC in Kansas City?

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On 2004 pontiac montana what does fuse 7 control


7-BATT MAIN 1
60A
Fuses: •
CIGAR/DLC/APO FRT
• CLUSTER BATT
• CTSY LAMP
• ON STAR
• PWR LOCK
• PWR MIRROR
• RAP RELAY
• RR PWR SCKT

look below for above listed componet's , pull those fuse's one at a time till arc stop's ,then you found your problem circuit . Do you know where the I/P fuse box is ?
Fuse Block- I/P
Right side of the I/P, in the right front door opening


Fuse Block-I/P Label
Fuse Block-I/P Application Table Fuse/Circuit Breaker
Rating
Description
BCM PRGRM
10A
Body Control Module (BCM)
ENHANCED EVAP/AWD
15A
Evaporative Emission (EVAP) Canister Vent Solenoid, Clutch Pump Check Valve
CIGAR/DLC/APO FRT
20A
Auxiliary Power Outlet-Front, Cigar Lighter, Data Link Connector (DLC)
CLUSTER/BATT
10A
Instrument Panel Cluster (IPC)
CRUISE
10A
Cruise Control Module (CCM), Cruise Control Release Switch, Cruise Control ON/OFF Switch
CTSY LAMP
10A
Body Control Module (BCM)
DRL
10A
Daytime Running Lamps (DRL) Control Module
HVAC/DIC/DRL/HEATED SEAT
10A
Air Temperature Actuator-Left, Air Temperature Actuator-Right, Daytime Running Lamps (DRL) Control Module, Driver Information Center (DIC), Mode Actuator, Rear Window Wiper/Washer and Multifunction Switch (Heated Seat Switch), Recirculation Actuator, Relay Block (Rear Window Defogger Relay)
ELC/TRAILER
25A
Auto Level Control (ALC) Air Compressor, Auto Level Control (ALC) Air Inflator Relay, Auto Level Control (ALC) Sensor
FRT HVAC HI BLWR
30A
Blower Motor Resistor Assembly
FRT WPR/WSHR
25A
Windshield Wiper Motor, Windshield Wiper/Washer Switch
HAZARD
15A
Turn Signal/Multifunction Switch
HEADLAMP
20A
Daytime Running Lamps (DRL) Control Module, Headlamp Dimmer Switch, Headlamp Switch
HTD MIRROR
10A
Outside Rearview Mirrors-Left, Right
HVAC/BLOWER
25A
HVAC Control Module
IGN1
10A
Body Control Module (BCM), Instrument Panel Cluster (IPC), Left Rear Side Door Actuator Control Module, Rear Object Sensor Control Module, Right Rear Side Door Actuator Control Module, Stop Lamp Switch
LH HEADLP HIGH
10A
Headlamp High Beam-Left
LH HEADLP LOW
10A
Headlamp Low Beam-Left
LH T/LP
10A
Tail Lamp-Left, Trailer Rear Wiring Harness
MALL/CLUSTER
10A
Body Control Module (BCM), Instrument Panel Cluster (IPC)
ON STAR
5A
Vehicle Interface Unit (VIU)
PASS KEY
10A
Theft Deterrent Control Module
PCM/ABS
10A
Electronic Brake Control Module (EBCM), Fuse Block-Underhood, Powertrain Control Module (PCM), Park/Neutral Position (PNP) Switch
PCM/CRANK
10A
Powertrain Control Module (PCM)
PCM/PASS KEY/CLUSTER
10A
Instrument Panel Cluster (IPC), Powertrain Control Module (PCM), Theft Deterrent Control Module, Instrument Panel Cluster (IPC), Powertrain Control Module (PCM)
PWR LOCK
20A
Body Control Module (BCM)
PWR MIRROR
10A
Outside Rearview Mirror Switch
PWR QTR VENT
10A
Auto Level Control (ALC) Air Compressor, Auto Level Control (ALC) Sensor, Rear Quarter Window Switch
PWR/HEATED SEAT PSD
30A
Driver Seat Assembly, Passenger Seat Assembly
PWR SLDG DR
30A
Left Rear Side Door Actuator Control Module, Right Rear Side Door Actuator Control Module
PWR WDO
30A
Window Switch-Driver, Window Switch-Front Passenger
RAP RELAY
10A
Relay Block (RAP Relay)
RH HEADLP HIGH
10A
Headlamp High Beam-Right
RH HEADLP LOW
10A
Headlamp Low Beam-Right
RR HVAC/TEMP CONT
25A
Air Temperature Actuator-Auxiliary, Blower Motor-Auxiliary, Blower Motor Relay-Auxiliary, HVAC Control Assembly-Auxiliary, Mode Actuator-Auxiliary
RR DEFOG/ HTD MIRROR
30A
Window Defogger Relay-Rear
RR FOG LP
10A
Fog Lamp Relay-Rear
RR PWR SCKT
20A
Auxiliary Power Outlet-Rear
RH T/LP
10A
Tail Lamp-Right, Trailer Rear Wiring Harness
RR WPR/WSHR
20A
Window Wiper Motor-Rear, Rear Window Wiper/Washer and Multifunction Switch
SIR
15A
Inflatable Restraint Sensing and Diagnostic Module (SDM)
STOP LAMP
15A
Stop Lamp Switch
SWC BACKLIGHT
2A
Steering Wheel Controls-Left, Right
T/SIG
10A
Turn Signal Switch and Backup Lamp Relay

Jan 09, 2018 | Pontiac Cars & Trucks

1 Answer

2003 Pontiac Montana heat gets hot in front, blows but seems weak, and no heat on rear controls but blows ******* rear. what is going on?


Is your heater blower motor working on all speeds ? Are you get any air coming from the rear vents ?

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On a 2002 Pontiac Montana where is the relay for the front and rear blower fans for the heat and AC


Should be in the relay - fuse box near the battery.
Your owners manual should have the details.

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2002 pontiac montana the blower fans for the air and heat dont work all the time only when they want to


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Im having problems with my rear lighs on my 2001 pontiac montana, the rear lights, i wanna check the computer relay fuse to see if that could be the problem but i dont have the manual to locate the proper...


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Wiring diagram for 2005 Dodge Caravan, rear blower for heating /AC


The most common problem would be a bad blower at which you can test for power at the motor connector with a testlight, the other most common problem is the resisitor ,theres one for the front blower and one for the rear blower, you may have a bad resisitor for the rear blower this resistor is located next to blower.theres also arelay in the fuse/relay box next to the battery under the hood,the best thing is to start testing for ower at the switch and work your way to resistor, i think you will find a bad resistor to rear blower motor.heres a complete wiring diagram of the whole front and rear heat and ac unit, everything is labeled good luck.johnjohn2_51.gif

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