Question about 1997 Pontiac Grand Prix

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The Fan speed has stop working on all setting except high/

On my a/c unit the speed of my fan control has quite execpt the high speed. Is this major or can it repaired easy

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  • NiTeZ Dec 24, 2008

    I have the same problem and I know a few others that do too. I checked my fuses and relays but all are good. It also interfears with the headlights as well. you turn it on any speed but high and your headlights go out. Has anyone found out what the problem is with this?

  • beneyce Dec 30, 2008

    I have a 2001 Pontiac grand prix. Blower motor only works sometimes on high / 5 I have replaced the blower motor and control relay and still have the same problem. My auto lights dont work either unless the blower is on 5 I also hear a clicking noise on the left driver side under the dash. My light work fine when turn on normal. Any one know ? Thanks

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The blower motor quit working all together. All fuses are good!

Posted on Dec 30, 2008

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So your fan stopped working on all settings but high....? sounds like a bad switch...i know alot of jeeps and fords have that problem....lemme know....might hafat add another car to the broken fan switch list....lol

Posted on Sep 30, 2008

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If you have a fan that has different speed settings (1234, or low med high etc) and the only one that works is high - then the blower resistor pack has failed. If you have a climate control unit (where you just pick a temp you want) then the fan is controlled by the heating system and it sets fan speed. If you have climate control style try lowering the temp to a lower setting (current temp in vehicle) and see if fan slows down. If not then climate control unit or fan resistor bad. If dial type and you get nothing on lower settings (only high works like mentioned above) you need to change blower resistor. It is located under dash near the fan itself. Look for small unit bolted in duct near fan with wire plug going to it.

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On any other vehicle it sounds like the blower fan switch.
The fan switch provides power or ground to the resistor and there would be a high speed blower relay to bypass the resistor.
But in your case the fan switch is part of the controller.
I don't have a diagram for a 92 but the 94 model shows relays for low medium and high speeds. Each relay gets power from a fuseable link. The high relay gets power thru the low relay if the low relay is not engaged.
If you have the model with 3 relays you may need to check them.

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Why wont my a/c or heater fan come on?


When the blower works only on the high setting its usually a bad blower resistor which is right near the blower motor. now you say it would always blow high regardless of the fan speed setting that would indicate probably the climate control unit or a connector problem somewhere. finally it not working at all may be the climate control unit or connection went bad even further. it might have a blown fuse or a bad blower motor in addition to the climate control unit or connector problem .check for power and ground at the blower motor. the power is supplied from fuses and may have a relay also. the ground is supplied from the climate control unit and goes through the resistor to control the fan speed. good luck

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The ac/heat fan only works on the high speed


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I'm trying to find out how many cooling fan relays are in a 1999 Ford Taurus SE with the 3.0L Vulcan OHV engine. This model year has done away with the CCRM (Constant Control Relay Module), so the relays...


fuse #9 protects the 2 cooling fan relays.

It looks like the hgh speed cooling fan realy is in a thin box mounted sideways between the battery and fender.

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Section 03-03: Engine Cooling 1999 Taurus, Sable Workshop Manual
DESCRIPTION AND OPERATION Electrical System NOTE: With A/C ON, the cooling fan motors will run continuously. Cooling fan motors will not cycle ON and OFF with A/C clutch (2884) .

NOTE: An exception to this is when vehicle speed is over 61 km/h (38 mph) and coolant temperature is below 100°C (212°F), and A/C head pressure is below 1.71 MPA (250 psi). The cooling fan motors will then automatically shut off.

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Engine Cooling Fan Control CCRM Applications The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure, etc) to determine engine cooling fan needs. The PCM controls the fan operation through the Fan Control (FC) output (single speed fan applications) or the Low Fan Control (LFC) and High Fan Control (HFC) outputs as shown in Table 2. Although the fan control (FC), low speed fan control and high speed fan control relays are normally open relays, the FC/LFC circuit is wired through a voltage inverter inside the CCRM. The voltage inverter ensures that the PCM must turn on (ground) the FC/LFC output to turn the fan off. This is done so the cooling fan will operate in the event of an open FC/LFC circuit.

Stand-Alone Fan Control Relay Applications The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure, etc) to determine engine cooling fan needs. The PCM determines engine cooling fan control requirements and controls the fan operation through the Low Fan Control (LFC) and High Fan Control (HFC) outputs (Table 3).

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2 Answers

Blower fan has stopped working except on high


The motor still works. A DC motor is speed controlled with a resistor. Luckily, the resistors that do this are mounted on the motor housing. See the following link. The resistor pack is quoted as costing about $10.
http://www.automotivehelper.com/topic294308.htm
Steve

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The airconditioning fan runs for a few seconds then quits. The rear operates fine.


Sounds like your blower motor has quit if it is inop on all levels. If high speed works and the other speeds do not, then its probally the rheastat or resistor pack

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Blower dosent blow on high


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