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Sean Bailey
Novice
Jun 22, 2012, 5:12 PM
Post #1 of 7
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ac/heater problem
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hi there well im not sure what the problem is i have a 99 ford f-150 4x4 the ac takes along time to cool down im pretty sure that ac needs serviced but when i come to a stop or am slowing down i can hear like a door close under the dash someone told me it could be a vacuum leak some where also im not sure if it has anything to do with it but my heater will only blow cool air also could it be a control switch as well that is running both heater and ac air blowing problem. its hot here in az and would like to address the ac problem first but if it is something that affects both ac and heater i could kill to birds with one stone hopefully
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 22, 2012, 6:16 PM
Post #2 of 7
(508 views)
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The vacuum controls operate the mode doors so what that would do is redirect the air elsewhere. If you're talking about a temperature issue, it needs to be checked out by an A/C pro.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sean Bailey
Novice
Jun 22, 2012, 6:30 PM
Post #3 of 7
(502 views)
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its never had any ac work done to it, after awhile it will cool down i thought about buying one of those r134 cans with hose and try and put some in it the heater hasnt worked for awhile but when you come to a stop or slowing down with ac on you can hear a door flap shut
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Sean Bailey
Novice
Jun 22, 2012, 6:41 PM
Post #5 of 7
(493 views)
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on the door sound where is the vacuum coming from and where is the door located is it accessible from passenger side of truck
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 22, 2012, 6:47 PM
Post #6 of 7
(487 views)
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Don't mess with refrigerant unless you have professional gauges to monitor both high and low pressures and you actually know what you're looking for.
Also read this carefully first http://autoforums.carjunky.com/..._A/C_SYSTEMS_P45460/
The mode selection is done through a series of air doors that are operated by vacuum. When there is either a partial or total loss of vacuum, the system will default to either defrost or on some vehicles, heat. Acceleration can also have an effect on the doors for the same reason.
Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sean Bailey
Novice
Jun 22, 2012, 6:51 PM
Post #7 of 7
(478 views)
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thank-you for your time im going to go check now
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