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Old 12-06-2004, 11:11 AM   #1
Blue85
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Need Help with Heater/Defrost

On my 70 GMC (with A/C) the defrost isnt working, there is warm air coming from the vents but the windshield won't unthaw, any ideas?
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Old 12-06-2004, 12:02 PM   #2
JimKshortstep4x4
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Smile

It is probably your diverter box. The doors come loose from the shaft that moves the door and the shaft moves but the door doesn't. That would be the first place to check. (The diveter box is next to the heater box).

Jim
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Old 12-06-2004, 01:11 PM   #3
jhow66
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Maybe your defrost hoses are off the vents.
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