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Re: 2000 chevy blazer my heater isnt working
Check temperaturesensor,replace thermostat,And if you turn on the fan you should hear it and feel air from the vents,if the fan motor is working.If it's not working,check the fuse for the fan.
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Have you checked the fuses. Check with test light power to the wiring socket at the heater fan with it switched on. If no power it can be the switch or the resistor or the relay. If there is power there the heater fan motor may need replacing. You need to check the earth wires. Make sure they are clean and tight
GM has a fuse panel on the left side under the dash. The fuses are labled HTR/AC. There is also a set of overload relays under the hood on the driver's side. They are also labled. The owner's manual has a diagram showing both the location and type of fuse to use. Cleaning the sockets with electrical cleaner when you replace the fuses helps them to make better contact.
Have your transfer case looked at. There is an electronic switch on it which could have gone bad which casues it to not work. Otherwise if your isnt electronic look on top of the case to where it shifts and make sure there isnt an ice build up causeing it to not engage. You could also have a bad hub in the wheel that is causing it to not engage
The wiper motor could be bad...the only wat to know is to check for voltage at the wiper motor. If the fuse is good and you have 12VDC to the motor...then the motor is bad. If you don't see voltage at the motor, I would suspect a bad wiper motor switch.
the age of the vehicle does suggest the heater core could be plugged, when the motor has been run awhile where is the temperature gauge (if it has one). ?
If i remember right it's not that bad a job to replace the heater core in those trucks... but it's been awhile for me. I would suggest some cardboard or something in front of the rad to see if it warms up at all. if so it is likely a thermostat that needs to be replaced.