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cab heater? there are 3 fans, engine,cab heat and A/C. so....
a stuck CAB switch is a bad switch. easy huh?
if the switch only works on high but does move, that is a bad heater fan Resistor block. (usually bolted to fan hosing as it is air cooled this part)
The fan switch could be faulty or worse case is you have combustion fumes being pushed into the cooling jacket. Yup blown headgasket. Take to a reputable shop and have them perform a block test. The fan could also have an intermittent fault and not kick on all the time when the relay demands it on. Good luck!
sounds like a bad blower resistor.The switch runs a straight 12 volts to the motor in high,but runs through the resistor on the lower speeds.The resistor is located somewhere on the HVAC unit(it requires airflow to avoid premature burnout).
you might want to change the thermostat and make sure there is no air in the system,make sure all the air is properly bleed out of the cooling system.also make sure that the cooling fan at the rad is working properly.if this doesn`t correct this have a combustion gas test done on the cooling system.
After a jumper test on the fans to make sure that they work, you might take a look at your coolant level or temperature sensor. The try testing or replacing any fuses or relays wired into your air conditioning and heating circuit. In my 1998 Buick Regal, the fans never run until the air conditioner or heating fan is turned on. Unfortunately, the A.C. compressor and the cooling fans also kick in when I turn on the heater fan switch. Your best option is to wire the fans to a manual switch on your dash or just drive really fast all the time.
there is a resistor for the heating and cooling fan speed. this controls the amount of voltage to your fan, which controls the speed. usually when the fan only works on high it will bypass the resistor and use the full 12 volts for the high setting. your power locks might be part of this circuit. i would check the resistor first then check the locks. usually the resistor is behind the high low switch
The blower is on the right hand side under the dash. You are right in thinking the blower resistor is the problem. The resistor is in the heater box behind the blower. Only 2 bolts hold it in but the back one can be a challenge to remove. The bolt is 5.5 mm.
Check for power and ground with a test light at the resistor connector. You should have power on the colored wires in the various switch positions. The black one is ground.
If # 4 is the highest fan setting it might be the resistor pack that controls the fan speeds.For each speed increase the fan switch takes a resistor out of the resistor loop The highest speed is a direct connection to the battery. The switch is usually located very close to the fan since it gets quite hot and needs to be cooled by the fan.It is also generaly accessible from under the hood,but not always.Sometimes it is under the dash Hope this helps.
Look behind the glove compartment door. Press the tabs holding it inward to let it drop out of the way.
I'm getting suspicious that the resitor block isn't to blame for these problems. May be the switch. The resistor block looks to be bullet-proof but it is a hard to test assembly.