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if you turn the selector switch of your aircon and only fan is working and no cold air coming out of the diffuser have your aircon fuse connected to the compressor check. If the fuse is not blown then have your thermostat be set to colder position. If the compressor still does not work have the thermostat be check by an auto aircon tech. If the thermostat is ok then look for any sign of oil in the piping of your aircon system possibly there is leak which causes the pressure switch not to function. If theres no refrigerant in the system the compressor will not be activated by the pressure switch.

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Q: How-to fix air conditioning in 2002 for f150 will not get cold even when you turn the knob?
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