2004 Chevrolet Avalanche "replace fan speed sensor" Questions

my heater fan only works on high You need to replace fan speed sensor ,located beside the fan under right side of dash

...fan speed.  Not sure what a speed sensor is.On most import cars, the speed is controlled  by the ground circuit.  If you have power and the fan will run if you ground it, check the fan ...

...fan speed sensor, often you have to fix or replace the wiring , rather that the sensor. Check that wiring has continuity, the wire to sensor must have +5V. Here an interesting website on trailblazer ...

1 , an high speed fan control relay 2 . Now what problem are you having ? Go on you tube an check out videos on testing cooling fan's , testing relay's .Before you replace a sensor you don't need too

...Fan runs when air conditioning unit is on. doesnt run when air is off. low or high speed! is the temp gauge working? sounds like coolant temp sending unit... or a possible engine coolant temp sensor ...

replace it). I don't think it is the ECT (engine coolant temp sensor) or the Cylinder Head Temp Sensor. Or the VSS or the MAF sensors. The electronically controlled fan clutch is controlled by the

...fan speed. When the solenoid is de-energized, the spring loaded valve closes, and blocks the path of the fluid to the fluid coupling of the fan clutch, reducing fan speed. The fan has the ability to ...

...fan to spin at low speed (overheating in traffic) or doesn't allow it to free-wheel at high speed (potential overheating on highway or reduced gas mileage). An electric fan can be either by itself ...

...fan is on low speed I can pull #1 or #2 fan relay the other fan then goes to hi then put relay back in and it will stay on hi until you turn off the car! I have replaced all relays new hoses Have you ...

...fan relays are wired in a parallel circuit. When the PCM detects that certain DTCs are set, the PCM will enable the cooling fans. The PCM will enable the engine cooling fans when certain Diagnostic ...