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The auto switch for the blower doesn't seem to work. the manual part works.

When turned to manual the fan runs, when on auto it doesn't. This is a brand new heater.

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Have you read the operating manual that came with it? In AUTO, it decides if the room temp. matches your setting you desired.
Other than that,I'd say it needs to be returned for refund. don-ohio (:^)

Posted on Dec 15, 2016

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99 grand cherokee blower selector high position not working. Blows only level 1-3. replaced resistor, same problem.


automatic or manual a/c.

I'm going to assume manual but Auto is simular and i can give some direction if you have that as well.

There will be a black with tan wire at the blower resistor. This is the wire the HVAC control head grounds to turn the fan on high speed. With a test light hooked to power unplug the resistor, set the blower speed to high, turn the key to the run position. the test light should turn on when you probe the connector. If it doesn't pull the control head and back probe that same wire at the back of the control head with everything still plugged in. If the test light again does not illuminate the the control head is bad and not providing ground

If the test light does turn on when you probe the blower resistor connector plug the resistor back in. Turn the blower speed to the low setting. With your test light hooked to ground see if there is power on the black with tan wire. if there is turn the HVAC off and ground that wire with a jumper wire. the fan should run at high speed. If it doesn't you have a defective resistor.

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I turned on the ac and the light does not work, the vents are not blowing and the car is running hot. I have a saturn SL 1996


First check the 15 amp HVAC fuse located in the main fuse block inside the car on the passenger side of the center console, under a cover. If the fuse is good, then the problem may either be the HVAC blower switch (which is the fan blower selector switch), the fan blower motor resistor, or the fan blower motor. An auto repair manual will explain and illustrate for you the steps on how to check each of these components.

Even after pushing the ac light switch on, the fan blower selector switch has to be turned on as well (working) because it provides an electrical path to the positive side of the battery to complete the circuit and turn the ac light on. What the ac light switch does is provide the electrical path for the ac compressor clutch to come on through the ac control relay which is controlled by the car's PCM(computer) when you want ac, but the ac light switch still needs to run through the fan blower selector switch to receive its power. You can turn on the fan without the ac light switch because it gets its ground path(negative) from the blower motor. So the blower motor has to work in order to provide a ground path for the fan blower selector switch to be functional. You could have a faulty blower motor which is why no air blows through the vents. The fan blower motor is located inside the car on the passenger side underneath the dash at the bottom end of the glove compartment box. You'll see it. It's right above where a person rests their feet on the floor. Therefore, if your 15 amp HVAC fuse is good, check to see if you have voltage at the blower motor connector. Unclip the connector and with the ignition on and the fan blower switch moved to any one of the first 3 selections, check for voltage using a multimeter. The voltage will vary because there is a blower motor resistor. Voltage should be higher on setting 3 than 1. If you do have voltage at the blower motor connector, check for a faulty blower motor. The auto repair manual will tell you how to do it using jumper wires.

It's normal that your car is running hot because the radiator fan works in conjunction with your ac compressor. If the ac is on, the radiator fan will be on and therefore the engine coolant temperature will stay in it's normal operating range. If the ac is off, the radiator fan will stay off as well and the engine coolant temperature gauge will begin to rise and show pretty hot (especially at idle). It will do this up until a certain degree then the radiator fan should turn on thermostatically and stabilize the temperature. It's scary and I know what your saying because it does that to my car if my ac isn't on. Don't worry it won't overheat.

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Model TWEO36C140A1 blower will come on if I throw the breaker switch...but thermostat doesn't seem to be in sync. Fan will run in "on" position and once blower is running, in auto. ...


If no relay I'm assuming this is an x13 motor. Try swapping speed taps 4 and 5. It's possible the winding is over heating. Tough one to diagnose without being there. With power off take pic of tstat wiring and remove all wires. Be sure to spread wires apart to prevent blowing fuse. Turn power back on. Red and white together should bring on heat and fan. Red green and yellow should bring on fan and compressor. Try this several times each way making sure the blower comes to a complete stop every time. If everything seems to work by bypassing tstat you likely have a bad stat. Provided swapping your speed taps was unsuccessful. Good Luck!!

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1 Answer

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{: ) It could be the BLWR fuse 40amp at the underhood fuseblock, a faulty blower resistor assembly, or the front blower motor itself.

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1 Answer

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Is the switch on the thermostat set to auto for the fan?

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