Hesitates, warm air is blowing through air vents and car shakes, I have to take my foot off the pedal and slow down for it to stop-took it to dealership they said nothing showed up on diagnostics test
Very strange.
Usually the ac compressor cuts off if the computer detects a major problem with the engine such as a power loss on more than one cylinder.
And if that happens the computer should store trouble codes for the issues.
Is the check engine light staying on ? Will the ac work if the engine idles ?
SOURCE: air conditioner not blowing cold air
go to a parts store such as Advance Auto Parts or Auto Zone and buy the A/C recharging kit they have with the rubber line and connector that connects only on the side that you need to recharge your system. If you can put air in your tires you can out freon in your a/c system.
SOURCE: 2003 Ford Explorer XLT Air Conditioning vents blow hot and cold
It sounds like the control motor switching from hot to cold is stuck halfway in between the two temp settings. You will have to take it down and replace it, it is mounted under dash passenger side near the blower motor.
SOURCE: 2010 fusion A/c not blowing out from vents
hi this sounds like the automatic vent system is not working try messing about with the vent control, put it in different positions it may just click in or you will be better off checking the fuses to see if one has blown, if not as it is a new car, you should be able to take it to any ford dealership and they would sort it for you under warranty...hope this helps
SOURCE: when i turn the air on it doesn't flow from the front vents.
Sounds like the switch or actuator is not operating. Some vehicles have mechanical operators, and some have vacuum actuators. If a vacuum line is loose, it will not actuate.
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What about fuel pressure?
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