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Heater problem

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Old 11-09-2011, 05:05 AM   #1
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Default Heater problem

I need a little help my truck is throwing only hot air I turn on my AC an only hot air comes out an I turn it to cool air an hot air still comes out I turn the heater an AC off an it's still blowing hot air any suggestion on wat could be causing this problem ? An I also have freon in my AC system

Anything suggestion will be appreciated
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Old 11-09-2011, 05:20 AM   #2
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trace the vacuum lines and see if there is a leak. also one of the vacuum actuators could be stuck of leaking.
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Old 11-09-2011, 11:30 AM   #3
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If air only blows out of defrost, definitaly look for a vacuum leak. Check operation of blend door. The blend door is what regulates the air across the heater core for heat and stops air across the core for AC.
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Old 11-09-2011, 11:59 AM   #4
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Bill is right, check the cable coming from the control to the blend door. They are bad about coming loose or coming off the door.
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Old 11-10-2011, 05:43 AM   #5
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Quote:
Originally Posted by Good old Bill
If air only blows out of defrost, definitaly look for a vacuum leak. Check operation of blend door. The blend door is what regulates the air across the heater core for heat and stops air across the core for AC.

Where can I locate the blend door at ?
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Old 11-10-2011, 09:17 AM   #6
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Its in the AC/heater box or plenium chamber. There will be two doors, either actuated by a cable or by vacuum motors. The one closest to the heater core is the blend door, the other door directs the air to where every you select.
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Old 11-10-2011, 10:20 AM   #7
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I have a nice little diagram from my shop manual of the different paths air can take through the system. Is that something I can post up here or will the copyright police be at my door?

Also, the temp blend door pivot should be visible on the left side of the air box when you remove the glove box... Should be quick to get to.
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Old 11-10-2011, 04:34 PM   #8
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Thank you everyone you all have given me good tip I'm going to check it out today in a bit an will keep u posted if I fixed the problem
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Old 11-11-2011, 02:07 AM   #9
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I check there blend door actuator an it's working fine so I'm guessing it could be the door that's stuck or broken off ? Does anyone know how to remove the heater box with the door in it ? Under the glove box
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Old 11-11-2011, 03:16 AM   #10
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did you look to see if the door its self was moving? if not here is what you do, first you take the glove box off, then you take out the 7 bolts that hold the plastic cover that is bhind the glove box the 7 bolts should be 5/16, then you have to hold the sheath that the cable goes through so that the door can actually move because the green clip keeps it from moving, then you move the lever on the dash and see if the door moves, the third pic is the blend door.
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Last edited by DriveAk; 11-11-2011 at 03:21 AM.
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