Question about 2004 GMC Yukon

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Air vent not working on two lowest settings. started about a year ago with only the lowest setting not working. now the second to the lowest setting is not working either. could this be a faulty blower resister/relay?

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CHECK YOUR WIRING BEHIND YOUR HEATER CONTROL RESISTOR AND CONNECTOR MAY BE BURNT

Posted on Jun 22, 2009

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Posted on Jan 02, 2017

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I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

Cannot get any air from dash vents while defrost and floor vents work fine...

Your particular actuator will be a different one than they found.
They're all a absolute pain to get at because they can be well buried in the dash. I would start looking under the dash on the passenger side, that's where most of the air control is. Cannot get any air from dash vents while defrost and floor vents work fine...

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1 Answer

Montana ac problem


some external sensor has taken a knock etc
sounds like its not getting whats going on outside
or the evaporator has an issue with its drains
perhaps something in the air intakes

Dec 23, 2014 | 2001 Pontiac Montana

1 Answer

My air condition and heat works on defrost only sometime comes out vents last seconds didn't matter were controller set


Not sure what year, make or model vehicle is in question, but the issue is due to an actuator that has gone bad. Sometimes referred to as a mode actuator or blend door actuator. This actuator controls where air/heat will blow from (defroster vent, forward vents, floor vents or combo, etc.). Good luck. Ron @ Speed-O-Repair.

Aug 24, 2014 | Cars & Trucks

1 Answer

Replace blend door actuator motor


Could be, check the door and see if it works correctly

Aug 17, 2013 | Mitsubishi Cars & Trucks

1 Answer

No air/heat coming through vents


u more then likely have a bad blower motor resistor

Jun 20, 2013 | 2000 Chevrolet Blazer

1 Answer

Heating system do not work. It started a couple of weeks ago. When set at 70, it produced no warm air. cold air would come from the vent/duct. when increasted to about 76, it would produce heat. Now it do...


I have the exact same problem. Started occasionally blowing cold air. Now I can't get the hot air to come through. Could it be a flapper door that open and closes depending on the tempurature setting?

Jan 04, 2011 | 2006 Lincoln Mark LT

1 Answer

BMW 320d e90 fan noise from AC/climate control unit. Very annoying. It comes and goes. Please note the AC/climate control still works and the noise seems to be the only problem. It only started a couple of...


Check if happening at specific settings on the fan. Fans use resisters to slow down their speed. Typically the lowest setting will mess up before the highest. If coming a going means you change the speed and it goes away.

If it doesn't matter what speed, there is probably something in your vents. Do you park outside? Mice love getting into warm cars on cold nights, and build nests... a nice comfy place can be in vents...

Or have very small kids... mine used to love putting things in the vents and have them disappear! Could be cherios

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1 Answer

2001 Nissan Sentra Air Conditioning problem


good day, try to check the compressor maybe thats the problem. i hope this tip will help you.

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