A/C problem
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Joined: Mar 2011
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A/C problem
All right guys. I have a 98' F150 with a 5.4. When idling the A/C works fine. When I accelerate heat begins to come out of the vents. It does not put out cold air again until the motor is back to idle speed. When adjusting the temperature, I can hear the blend door motor turn but I don't hear the blend door shutting. Should I hear it shut or do I have a vaccum problem. I don't know where to begin if it is in the vaccum hoses. Any suggestions will be appreciated.
Sincerely,
Roasting in Tennessee
Sincerely,
Roasting in Tennessee
Logistics Pro
Joined: Jul 2003
Posts: 3,595
Likes: 52
From: Lawton, Oklahoma
98 blend door actuator is electronic so vacuum wont affect it. You likely have a broken blend door and when you accellerate the door flops open letting in the heat. You will need to remove the instrument panel to remove the top of the plenum and replace the door assembly which comes with a new frame for about 60 bucks.
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