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Posted on Dec 10, 2013
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Climate control front blower does not blow when weather is cold outside - thus no heat no defrost

It works when the weather warms up. And when cold out the heat does waft out lightly when the temp is set to hot, but the blower will not blow. Have checked pertinent fuses - any ideas?

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  • rick brenneman Jan 08, 2014

    my does the same i have a 02 yukon i found out it is freezing up the wind blows thru cow straight to blower motor

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  • Posted on Jan 08, 2014
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I have a 02 Yukon and my blower motor does not work when cold either I found out it is freezing up when cold

Benjamin Spencer

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  • Posted on Dec 10, 2013
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Sounds like you need a new thermostat. When its cold its sticking.

Testimonial: "Huh? Their is hot air. Heat blows out the back just fine. Are you saying there is a thermostat that controls the front blower?"

  • 2 more comments 
  • rm_john Dec 10, 2013

    Huh? Their is hot air. Heat blows out the back just fine. Are you saying there is a thermostat that controls the front blower?

  • Benjamin Spencer
    Benjamin Spencer Dec 10, 2013

    if you are getting constant heat then no your thermostat is not at fault.

  • rm_john Dec 10, 2013

    Okay thanks, Benjamin. the blower motor just will not kick on when the outside air temp is cold. If the outside air temp heats up enough, then the blower will kick on. But even when it is cold out, and the blower will not kick on, there is a constant flow of hot air that will drift out the forward vents and/or the defrost if set to defrost. It seems like a possible thermal issue, like a marginal connection that that loses contact when temps drop below a certain point.. Just wondering if anyone else has had a similar problem - where to start?

  • Jeff Baldy
    Jeff Baldy Jan 22, 2014

    I have the same problem with my 2006 yukon. I have found that if I set the temperature to the lowest (60 degrees) and turn the heater on and off - might take several times - i can usually get it going again. Then I turn the temperature up and all is well. This only seems to happen when the outside temperature drops below 25 degrees. Once it is warm in the cabin, I have no more issues. Suppose it could be a bad sensor or something?

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Anonymous

  • 172 Answers
  • Posted on Jan 07, 2010

SOURCE: 2005 GMC Sierra 1500 - heater blows, but only cold air

Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."

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Anonymous

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  • Posted on Nov 02, 2010

SOURCE: 2005 GMC Yukon Denali XL - Climate Control issue-

Are you aware of any codes that may stored in the body control module and do you hear a clicking or ticking noise in the rear?

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2008 Ford F150 5.4 Litre Problem: A/C only blows cold air when stopped. As soon as I start to drive warm air mixes into vents.
Which of these two systems does your truck have?

Electronic Automatic Temperature Control (EATC) System
Or
Electronic Manual Temperature Control (EMTC) System


Electronic Manual Temperature Control (EMTC) System
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The EMTC system operation is determined by the settings on the climate control module. The EMTC system is composed of the EMTC module, blower motor resistor, mode door actuator, air inlet door actuator and temperature blend door actuator to control the various functions.
The blower motor switch:
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The A/C request button:
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The function selector:
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The temperature selector:
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The air recirculation button:
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  • is disabled in DEFROST mode where outside air only is used.
  • is serviced only with the EMTC module.
The EMTC module also includes:
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  • heated seat controls. Refer to Section 501-10 .
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not told HVAC mode,so answer are impossible or crazy too long.

AC cooling modes can do that, if the evap core ICE's up.
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THE PCM can also disable AC cool mode for many reasons.
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on climate control versions of HVAC it stops heating and cooling as
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manual controls have no such dial.
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If this doesn't work, plan on 1-1.5hours of labor for a technician to reset the actuators at the dealership.

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A/C -- Blower controls not working
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The car keeps coming up a code 23 on a 1999 chrysler 300 for the
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On cars with automatic climate control: To enter diagnostic mode, set the temperature to 75F, press the the off button. Press Floor, Defrost\Floor, Front Defrost simutaneously for 3 seconds until the temperature display begins to flash.
On cars without automatic climate control, set the blower to any speed, turn the temperature control in between warm and cold. Press Floor, Defrost\Floor, and Front Defrost. All codes will flash via the Front Defrost button.
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31 ATC recirculate door stall failure
32 ATC blend door failure
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2008 Ford F150 5.4 Litre Problem: A/C only blows cold air when stopped. As soon as I start to drive warm air mixes into vents.

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