Question about 2000 GMC Sierra

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Small amount of air from heat vents 2000 gmc serria

Blower switch is on high, but very little air comming out

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  • Anonymous Apr 27, 2009

    It maybe in cab air filter my filter was clog and it did same utill
    I replace it.

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Heater matrix needs replacing

Posted on Jan 05, 2009

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1 Answer

My front heater is throwing very little heat the back is throwing more heat could hear the back blower but not the front


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you may have had something fall down into the defrost vent and it has worked its way down and is blocking the air flow thats trying to come out the vents,near the blower motor.also does it sound like the blower motor is spinning on high speed or at a lower speed,you could have a slow turning blower motor.

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Mar 30, 2011 | 2000 GMC Sierra

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How to troubleshoot the electrical air conditioning system 2000 GMC Yukon Denali. I put in new resistor, relay and dealer blower motor and it still doesn't do anything. Air conditioning control switch...


The compressor on the air conditioner in my 2000 GMC Yukon XL went out last summer. Had it and the whole line replaced at a local air conditioning shop last fall. Used it little before cold weather. Warm weather this spring and no cold air. We could hear the compressor trying to kick in. The shop told us that the control console was bad and had to be replaced. They told us the part was on back order and did not know if they would be abel to get one any time soon. We took the Yukon into the local GM dealership. They told us that the high side fitting was bad and that the freon was very low and that they would have to deal with that first to check the system. Called back to the air conditioning shop and they said they had a console come in and they would put it in and check the high side fitting. I now have cold air and questions. Bought Yukon in 2005 used, had always had problem of not switching to cold air once the heater has been used. We were told changing the console should fix that. It has not changed. I feel like the console angle was a scam, that the system was just low on freon. Each shop was blaming the other for trying to scam me. And what can fix the heat to cold issue? If anyone has answers I would sure appreciate the knowledge.

Jul 02, 2010 | 2000 GMC Yukon Denali

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The air blows but it don't heat like it suppose to nor do it allows the defroster to work. it a 2000 gmc jimmy 4-wheel drive someone says it may be the heating core


Sounds like a vacuum activated switch. Your engine vacuum is used to open and close little doors in your vents. If a hose is loose or disconnected or the electronic controls that tell the switch to let vacuum thru is not working, no air will reach your defroster vent at the windshield. Does the switch that controls Vent, Heat (sends to the floor), AC and MAX AC do anything at all? If they do, you may have a specific switch problem. If you switch from Vent to MAX AC the sound of the air flow should be much louder. If the switch isnt changing where the air blows, it is leading you to the problem. Either the switch is bad or the supply of vacuum to the switch is not there whether it is a loose vacuum hose or a disconnected one. Happens often when aftermarket stereos are installed and the installer disconnects something either by accident or forgets to reconnect it.

Apr 09, 2010 | 2000 GMC Jimmy

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2000 Buick Century . Blower motor works but no air comes out of the vents. I move the controls to all settings and nothing changes. ir only comes in while on the highway, but very small amount.


The louvers inside your vents are powered by a vacuum (?) that comes through a small rubber tube under your hood. I had to do some intensive googling to find this out. Usually what happens is that you change your battery, and accidentally pinch the rubber tube. If you're lucky, the mechanic will believe you before they start replacing parts. Maybe you can even find it yourself!

Jul 12, 2009 | 2000 Buick Century

1 Answer

Heater blower


Sounds like the blower motor resistor is bad. These things go bad all the time. and for the switching modes there is a vacuum line that runs under the window in the engine compartment and runs by the alternator, its tiny and may take a few minutes to find. check first by the evaporator case and follow it by the alternator to the driverside of the throttle body. these too break and will not allow the heater mode changes. the blower motor resistor controls the fan speeds and the vacuum line allows which vent the air flow goes through.

Feb 09, 2009 | 2000 GMC Safari

1 Answer

1998 GMC Serria Van Heater won't blow.


Start at the relay for the heater/ac making sure it is working. Remove relay and clean it off then replace making sure there is current through to the other side.Use a test light. from there you can go to the blower motor wiring.Under your dashboard. Look for the resistor which is a switch type gadget in between the battery current and the blower. Check to see if there is current passing through to the wiring before getting to the resistor.Replace if nessesary.

Dec 15, 2008 | 1998 GMC Sierra

1 Answer

1992 240 Gl, Windshield air vent/defroster has almost no output


wow...here it is spring and no one answered either of you? Is there a large volume of air when fan is on high? Where is it going? Or do you not hear anything from the fan? The 240 has an awesome heater. On high it would heat a small home! If no sound, your blower motor is dead assuming the fuse is good. If you hear the fan blowing, figure out where the air IS going. Note that the only way to turn the dash vents off is with the white Oreo dials. To defrost, only that button should be pressed in and dash vents off. Behind the dash switches there is a maze of short vacuum hoses. Often times, people monkey w/ these and reconnect them incorrectly. Haynes manual or Chilton's have proper diagrams. It could be that the vacuum hose coming from the manifold and entering the firewall is split on the under side and not visible, also.

Sep 23, 2008 | 1988 Volvo 240

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