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Re: problem with fan on a 1998 chevy silverado ext cab...
When it doesnt come on next time, put it on high and give it a hit with your hand and see if it comes on. or test it for power at blower with test lite
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SOUNDS LIKE THE SWITCH & OR THE BLOWER MOTOR RESISTOR, ARE THE PROBLEM WITH THE LOWER SPEEDS. SPEED 5 MAY HAVE ITS OWN FUSE, REFER TO OWNERS MANUAL FOR INFORMATION ABOUT THE HEATER/AC FUSE.
2004 chevy tahoe 4x4 had the same problem wont turn right at idle - like no power steering , has hydoboost brake steering system , did test and found steering box bad , removed box and remove the top cover on box 4 bolts at hydralic cover and removed and found spool valve has 4 seals 1 outer was blown i replaced box with reman from advance auto about $200.00 and flushed system , drove great problem solved .
You will need to pull the dash and a bunch of other components in order to access the heater core. Getting ready to do the same repair and really not looking forward to it.
there is a motor actuator that moves these doors for hot and cold, two separate ones for either side. the motor unit for drivers side is no good and needs new one. replace this and all will be good.
your speed switch located in heater box usually one wire to it in passenger feet area above "TOES" usually you loose 1 or 2 speeds on fan but it is unplugged or completely cooked good luck!
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