Question about 1998 Chevrolet Suburban

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My front heat and defrost doesn't blow anything, but the back does.

The defrost and the heat blower will not work in the front, but it will work in the back.

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  • 16 Answers

Check the blower resistor located on the blower.

Posted on Jan 03, 2015

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Posted on Jan 02, 2017

  • 124 Answers

SOURCE: heater control 98 chevy s10 blazer

These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Posted on Dec 13, 2008

  • 104 Answers

SOURCE: astro van 1997

There is a flap in your heater box that is controled by your vent switch by your heater controls. listen for a vacuum leak. that is common and hopfully the problem. there is vacuum lines that control the vent door that redirects the air to your vents.

Has your dash been messed with recently? if so i would check there first. you should hear a hissing if thats the problem.

Otherwise these also are common for that door flap to break and not switch NE more. thats the only 2 things that i can think of off th wtop of my head to be the problem. this would require the whole dash to come apart if its this problem

Michael
ASE certified

Posted on Feb 22, 2009

  • 28 Answers

SOURCE: Defroster & floor blowers don't work but front facing vents do

There are what they call mode door's these days they have a electrical motor that turnes the door to different posistions...sounds like yours is become broken. It would depend on your expertise in the ac & heating system area to replace the part. Sometimes easy and most of the times the dash has to be removed.

Posted on Apr 02, 2009

  • 1608 Answers

SOURCE: Blower air just through defroster vents, not front vents

The problem is that the plastic lines that the air flows through get frail and cracks and breaks.What happens is when the hose breaks you loose vacuum and the system reverts to defrost mode.You should be able to see it from under the hood on the passengers side.You will have to find the area that is broken and then go to the parts store and get some rubber hose that will fit over the plastic hose.Take a piece of the plastic hose with you so you can get the right size hose to fit over it.This just happened to my 97 Astro van.I found the broken hose and repaired it with the rubber line and is working normal now.Hope this helps.Let me know what you find out.Good luck.

Posted on Jul 20, 2010

  • 3 Answers

SOURCE: Heat wont blow through heater or defroster vents

Had the same problem. believe it or not i changed the gas cap and got heat all around. something about pressure.

Posted on Dec 07, 2011

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The back or rear defrost is an electric grid that works independently of the heater. If replacing the thermostat produced heat, you would seemed to have solved the problem but the heater blower could still be at fault. If you can't detect warm air actually blowing into your Taurus the blower is a likely suspect. A faulty blower also would affect your A/C.

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Blower on heat/a not working


So it works with a/c but doesn/t work with heat. Is that what your saying?
Or it blows cold air on heat selection?

If it blows but only blows cold air on heat selection
check out the following items:
temperature selector switch
blend door actuator and motor.



Here are a list of items to check out or have a shop inspect if it doesn't blow anything at all.
a) on/off switch
b) relay
c wiring
d) resistors
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The blowers ion the back have there own blower motor. The front has it's own. The resister controls the range the blower motor runs on,( low, medium, high). If the blower motor is not working it may be the motor itself. Was the fuse checked:?

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No heat in front but back heat is working


could be a blower motor resistor or a faulty blower motor. if no air is coming out of the vents when you turn the switch to on there is a fault in the electrical system somewhere. the rear blower system is pretty much totally separate from the front so therefor rear hvac is working properly. test blower motor resistor and blower motor current and see if its putting out any power also make sure the wires going to the blower motor are hot also.

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most american cars force the defroster to blow cold air, this is not a problem, it does this by design.

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