Question about 1999 Chevrolet Silverado 1500

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Heater blower does not appear to work for 1 and 2 speed selection. Blower motor does work at speed 3 and above.

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Sounds like blower motor resistor is burned out

Posted on Oct 13, 2010

Testimonial: "Replaced blower motor resistor and all works fine now."

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1 Answer

Heater fan runs when heater is off.06 ford expoler


Automatic or manual climate control ?
  • The blower motor does not operate correctly - manual climate control
  • Circuitry short
  • A/C blower motor resistor
  • A/C blower motor switch
  • Blower motor high speed relay
  • Go To Pinpoint Test O .

  • The blower motor does not operate correctly - EATC
  • Circuitry short/open
  • A/C blower motor speed control
  • EATC module
  • Go To Pinpoint Test Q .

Pinpoint Test Q: The Blower Motor Does Not Operate Correctly - EATC
Normal Operation Under normal operation, the blower motor control module receives a 1-2 volt signal from the EATC module through circuit CH218 (GN/VT) to determine the desired blower motor speed. The EATC module receives a feedback voltage from the blower motor control module through circuit VH219 (GY) to determine actual blower motor speed. When the highest blower motor setting is selected, the EATC module sends 12 volts to the blower control module through circuit CH217 (BN).
    Possible Causes
  • An open, short to voltage, ground or together in circuits CH218 (GN/VT), VH219 (GY) or circuit CH217 (BN)
  • Blower motor control module
  • EATC module
  • If automatic HVAC system i would suspect Blower motor control module .

Oct 27, 2016 | 2006 Ford Explorer

1 Answer

Mazda bravo 2.5TD blower fan only works on speeds 3 and 4. Is it the resistor or the fan motor


ballast resistor for sure as this lowers out put to blower motor and increases power as your select a faster setting balast resistor shoud be located on motor or near by hope this helps phil

Aug 16, 2012 | 1998 Mazda B-Series

2 Answers

Heater blower stopped working?


Hello,
You may want to try your fan on all speeds. If it will work on high, you have a bad resistor for the fan motor. ( high speed doesn't go through the resistor ).
If it doesn't work on any speed, I would check the following;
1. Make sure the fuse isn't blown for the fan blower motor.
2. Check, or have checked the wires between the fan control switch and the fan blower motor.
3. Have the fan control switch checked.
4. Have the fan blower motor checked.

I hope this helps you.

Feb 03, 2011 | 2002 Buick Rendezvous

1 Answer

2004 Chev silverado speed 1 and 2 on heater control do not work. The 3 speed thru 5 works


It sounds like the blower motor resistor is going bad. It's located near the blower motor. I would also check the connector going to the blower motor resistor.

Nov 21, 2010 | Chevrolet Silverado 1500 Cars & Trucks

2 Answers

My heater only works when i go above 50 miles an hour, and it only blows one speed, what is wrong?


Having to increase speed to get any heat means that your coolant may be low, as far as only 1 speed, the switch for the heater may not be working properly

Nov 12, 2009 | 1995 Ford Contour

3 Answers

Subject: 2004 isuzu rodeo...my ac/heater blower is not working


The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.

Jul 29, 2009 | 2004 Isuzu Rodeo

1 Answer

Switch for blower motor for heat & ac


Sounds like you need a blower motor resistor. It has bad paths between the 1 and 2 speed circuits.

Jun 02, 2009 | 1999 Oldsmobile Alero

1 Answer

2004 Ford F150 - AC/Heater blower speed 1 & 2 not working.


You might have a bad speed selector switch, or your blower motor resistor is faulty.

Mar 17, 2009 | 2004 Ford F150

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