For the ac to stop working either the compressor clutch is not getting power or the gas is too low so the low pressure switch has switched the compressor off to stop sucking in air through the leak. The blower is controlled by the fan switch which is a 3 positional switch that has a resistor for each position. These resistors have a habit of burning out so the fan will not work. The resistors are in a block located in the blower housing. So you have two faults to fix.
SOURCE: My heater blower stopped working
Hello,
The blower motor, as you have probably seen, is under the dash on the passengers side. While in Park with the parking brake applied:
Turn the Key On with fan blower set to High. Locate the blower motor and wiggle the electrical connector. If this brings the blower motor to life, a new blower motor is needed. This, if applicable, is a common failure that matches your symptoms. The new blower is simple to replace, although it is never fun working under the dash.
If you have a 12 volt test light or DVOM (multimeter) you can check for power at the electrical connector. You should have battery voltage (12+) with the blower set on high. Always use a known good ground when testing for power. If you have power (key on, set to high) and no blower operation the blower motor needs replacing.
The resistor you replaced is a very common failure on these.
Give me an update.
SOURCE: 2002 F-150 blower motor stopped working.
There are 4 things to check out to pin point the problem: the switch it's self, the blower relay switch, resistor block, and the blower motor it's self. good luck
SOURCE: heater blower stopped working all fuses ok
check the connections at switch and motor if good will need a volt meter or test light to check the switch and blower motor for power
SOURCE: The HVAC blower fan on my 2001 Pontiac Aztec
the blower not working on settings 1-3 is the blower motor resistor. this limits the power provided to the blower motor itself to change the speed. at setting 4 it is getting full power. since it quit on 4 also, i would still say the resistor needs to be replaced first, then see if the blower comes back. you may also need a blower motor. if you have a voltmeter you can just turn the switch to 4 and see if the motor is still getting 12 volts. if it is and doesn't run, it needs a blower motor too. if it's not, then its just the resistor
Testimonial: "Thanks! Sounds like an easier fix than I thought."
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