Question about 1999 Chevrolet Suburban

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Heater problem my suburban has a heater problem, i have replaced the relay, and resistor .i have hot air coming out but only at a low speed , seems like its not selecting the middle and top speed, even thou the switch feels good., should i replace the switch or is there another issue?, thanks

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Whats the problem

Posted on Feb 09, 2014

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Posted on Jan 02, 2017

keemo68
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SOURCE: 2004 Chevrolet Silverado Heater/AC Blower on without Ignition ON

there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate

Posted on Oct 04, 2008

emissionwiz
  • 75797 Answers

SOURCE: heater does not blow hot air on full heat setting

the problem is caused by the motor that operates the air temp blend door motor in the heating ducts, it blends air between AC and heater core tro give desired outlet temp.

Posted on Dec 12, 2008

SOURCE: 1995 Chevy k1500 heater problems.

For a 95 Chevy Silverado....I replaced the Blend Door Actuator on the passenger side. Just behind the slide out cup holder. Yo ucan acces easily by removing the ash tray piece and the glove box....Or just the glove box and work like hell to get a socket in a tight place.

There are 2 actuators....one controlling the (Mode and Temp 89018681) and the other the (Air Inlet 89018367). I called the dealer and the parts were 85-125. I got it From TBA Auto (local store) for 39.00. A 20 min job at most.

Posted on May 28, 2009

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1 Answer

The heat blows cold and hot. Is it the resistor module or the themostat


The resistor controls fan speed, not temp.
If the heat comes and goes, it could be the thermostat, or the radiator could be low on coolant, or have air pockets, or one of the blend doors may not be working correctly.
The blend doors direct air thru the heater core and the vents.

Dec 20, 2012 | 2003 Chrysler Town & Country

1 Answer

Blower motor only works on low and medium on 2007 dodge nitro


You replaced the resistor and WHAT relay? The blower motor circuit on a 2007 Dodge Nitro does not use a relay.

The blower resistor gets it's power from the A/C - heater control unit.

If you check for voltage at the blower motor resistor connector (Key on, relay disconnected), the DARK BLUE/GREY wire should be hot when the control switch is on HIGH. The DARK BLUE/VIOLET wire should be hot with the switch in the MEDIUM 2 position.The DARK BLUE/ORANGE wire should be hot with the switch in the MEDIUM 1 position. The DARK BLUE/BROWN wire should be hot with the switch on LOW.

If any of these are not as stated above, then you either have a bad A/C - heater control unit, or faulty wiring between the control unit and the resistor.

Jun 02, 2012 | 2007 Dodge Nitro R/T New Cars

1 Answer

All the heater blower speeds work on my 1998 Suburban except the high speed. I have replaced the blower motor and the switch. What else could the problem be? I have seen some writings about a resistor but...


Hello Boco.

In your Suburban there is a high blower relay.
When the switch to high is selected it activates a relay to another circuit that is fused separately.
This fuse in under the hood marked blower fuse 3 which is a 50 amp fuse.
This is most likely the problem.
However, if it isn't then the problem becomes the relay, the switch or a broken wire.
If it isn't the fuse, contact me back here using comments and I will help you with the next step in fixing your heater blower.

Thank you for using FixYa.

KL

Jan 21, 2011 | 1998 GMC Suburban

1 Answer

I have a 1991 Buick Park avenue with 44,000 miles that is not blowing air through the vents. I just put a brand new resistor in and that changed nothing. The fan spins at a low speed when the car is turned...


Switch the relay with one of the other relays to make sure that this relay is good then go to the HVAC control programer which is behind the floor vent (middle). The Blk/gray wire is the one that supports the relay coming out of the HVAC programmer, but there is a chance that this programmer is bad. If that proves to be the case, I may even have one...let me know.

Aug 06, 2010 | 1991 Buick Park Avenue

1 Answer

Heater fan seems to run at very low speed


If it smells like "Burnt Plastic",stop using it,and take it somewhere to get looked at,if your not a mechanic.
It's a pretty big job to remove the dash to get to the
blower fan. It sounds like the resistor, or fan blades are hitting the housing of the fan.Good luck.

Apr 01, 2010 | 2006 Chevrolet HHR

1 Answer

I have low voltage on the supplys side of the heater circut it is about 8 volts instead of 12 other circuts are fine, where does electricity for this circut come from there two small brown wires that come...


There is a resistor asm in the heater/A/C air duct. Different resistors a inserted in the power circuit to determine the blower speed. So you will read different voltages depending on the speed selected. Circuit goes from the fuse to the speed switch, to the resistor asm to the motor. High speed usually comes from a different circuit and through a relay that the speed selector energizes when High is selected. On your truck I think it's next to the A/C evaporator in the engine compartment on the passengers side just in front of the glove box.

Feb 10, 2010 | 1995 Chevrolet C/K 2500

1 Answer

Heater &air wont work


Resistor , check it out. Conect power to the motor direct , see if it rotates. Hot wire it with a fuse and a swich through the resistor for different speeds. It will be manual not auto unless you want to change the module. Re calibrate the vent doors , and do a diagnostic if you have tha auto modul . Vitally

Jul 02, 2009 | 1996 Chevrolet Astro

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1983 Chevrolet Suburban Heater fan not working


Heater blower motor resister is bad, replace, located under dash above heater motor.

Mar 15, 2009 | 1983 Chevrolet Suburban

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99 Yukon - Blower Motor Not Working


I went through the same thing with my 99 suburban. It turned out to be the dash fan control switch. It is purchased seperate from the whole cluster for under twenty dollars. The instrument panel cover comes off gently by hand with the tilt steering in the down position. You have to then unplug the electrical plugs to get it out of the way. The heater ac control panel then comes out by hand far enough to unsrew the heater fan control from the back.

Nov 30, 2008 | 1999 GMC Suburban

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