Could be a long list of choices.
Nothing special happens when the ac is on other than the extra load on the engine.
You probably have a slight miss-fire most of the time and the ac makes it worse.
A miss-fire could be a faulty spark plug, wire, coil pack, or injector among other things.
Is the check engine light on ?
SOURCE: The ac on my 2002 ford ranger is not getting very
Have a set of ac gauges put on the truck to make sure the pressures are correct,to see if there is a restriction,and if it is low on freon.
SOURCE: 2002 ford ranger 3.0 is missing on 2 cyl plugs ok injectors ok new coilpack
do a compression test,as the intake manifold,like alot of fords is no good.
SOURCE: 2002 ford ranger chaging to high
sound like voltage regulator problems.alternator field grounded.open rectifier.loose connections.make sure your wires not loose. also have autozone or advance auto. check out alternator before replacing it.
SOURCE: 2002 ford ranger air conditioner is not working.
on the central fuse box inside the vehicle there are fuses 12, 10, and 2
on the under hood fuse relay box 7,17,25,16.
check those and report back.
SOURCE: I have a 98 Ford Ranger, 3.0L. I replaced the EGR
i would change your idle air controle its 60$ and a great start
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