Question about 1979 Pontiac Firebird

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Blower blows high flow only

87 Olds Calais, blower will function on high only. I changer the control panel, blower resistor and fan motor. I suspect there must be a wireing problem possibly a grond wire

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One item you missed... the fan relay!!!

Posted on Feb 08, 2009

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What about the control switch, did you change it????? usually the switch will only run on one speed. mesna the switch is bad. You could pull the switch off, and get a jumper wire and cross the other speeds out to see if they will work.

Posted on Feb 08, 2009

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How do you know if your blower resistor is bad?


Unlikely a blower motor resistor problem. If the resistor is faulty. the fan speeds will not work/fail on the lower speeds. High speed will normally always work. If the fan is non operational suspect a fan motor issue.Bad fan motor/switch/wiring to it

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REPLACE BLOWER MOTOR RESISTOR. IF YOU GET ONLY ONE CONTROL SPEED.IF YOU HAVE ALREADY REPLACE BLOWER MOTOR RESISTOR.BLOWER MOTOR CONTROL SWITCH BAD. REASON BLOWER STAY ON ALL THE TIME.FAN BLOWER MOTOR RELAY BAD.
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01 grand.prix ac fan switch only works on high. has a duel temp controller when you turn fan off the only way fan comes back on is to move the temp controller levers


Hi!!
When the Blower Motor Resistor (controls blower speeds) goes bad, the blower motor works only on HIGH SPEED. REPLACE IT.
BLOWER MOTOR RESISTOR Removal & Installation
  • Disconnect negative battery cable.
  • Remove right lower instrument panel insulator panel.
  • Disconnect blower resistor connector located behind right side of dash.
  • Remove blower resistor screws and blower resistor.
To install, reverse removal procedure
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa!!

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May be but next to the blower motor is the blower control module this has a series of resistors in it to change the current flow to the blower motor ,.When you call for high speed on the fan it bypasse's the resistor module, on all other speeds it runs through the resistor. so check for power going into the blower module from the control panel on some speed other than high if power is at the module control panel is ok. if not blower module is bad

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1 Answer

Blower motor won't work, even with new motor.


Hello Travis.
If yours is dual zone, I believe the resistor (blower control module) is a solid state. Did you check it using the fan speed selector and test the voltage output on the purple wire?
The gray black wire going into the resistor is a variable voltage output from the heater control panel. This signal is amplified by the resistor/blower control module.
The black wire out of the resistor also needs proper good ground.
There is a fuse in the underhood relay/fuse panel that feedback from the resistor output to the blower (purple wire) is also fed back to the heater control panel. Verify this fuse is good.

When blower motors go bad they will often absorb a lot of electrical current. This current has to go through the blower control/resistor and will often burn them out due to the heat developed from the high current load.
These resistors are also mounted in the airflow out of the fan motor to help cool them so if the fan is still drawing current and not blowing the resistor overloads and burns it out.
Not sure how you tested the resistor but I suspect yours is faulty.
If you would like more advise let me know.

KL


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1 Answer

MY HVAC fan stopped blowing. Checked all the


Check the blower motor speed control resistor pack is ok.
(The resistor pack is usually located in the blower fan ducting in the air flow).
Check condition of electrical connection terminals on the blower motor circuit - these terminals pass considerable current and over time may fatigue overheat and loosen.
Check operation/replace any blower motor control relay,
Check the blower motor will run if +12v directly applied to the blower motor.
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3 Answers

A/c fans wont blow


If the fuse is blown for the blower then there is a short, that is not an answer, go to the blower and check to see that the blower motor connector has 12 volts to it when the blower is set to high speed on control, if it does then u need a new blower motor, if it doesn't then the control switch is defective or the blower motor speed control resistor is defective.

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2 Answers

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This could be a few different things:

1.Check the power and ground connections on your blower motor, corrosion can cause high resistance and a slow blower speed.

2. Check your available voltage at the blower motor on the different settings. it should vary with high supplying 12volts, make sure to do this check with the blower motor still plugged in.

3. Connect the blower to a 12v power source and see if it runs at high speed.

If all else fails i would check your resistor pack, i would not suspect this because when it fails you usually just loose all speeds except for high, but it could happen.

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The problem is the blower motor speed control resistor, it is located near the blower motor in the housing.

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