My 97 GMC Jimmy whenever I turn the fan on for my ac it makes a loud screech that gets louder each higher fan speed I also here the fan going extremely fast as something will make little clanking noises with the fan box behind my glove box. If it needs entire replacement I could use an estimate all the mecha men up here are crooks.
It sounds like a fan blade is bent and is making contact somewhere , these are usually aluminium and easily pushed back into shape , but if the fan has worn out its bearings it will need to be replaced unless there is some sort of material that has wrapped itself around the fan causing it to jam up .
SOURCE: 1993 GMC Suburban K1500 Air Condition Fan and vent choice problem
MIKE.
#1) YOU PROBEBLY HAVE A BAD BLOWER MOTOR OR POSS. A BURNT CONNECTION @ THE MOTOR. IF THE FAN WORKS ON ALL SPEEDS EVEN INTERMITTENTLY. THEN THE BLOWER RESISTOR IS OK WICH CONTROLLS THE VOLTAGE TO THE MOTOR TO GET THE DIFFERENT SPEEDS. WHEN THE RESISTOR BURNS OUT THE FAN JUST WON'T WORK ON CERTAIN SPEEDS. THE "RELAY" IS ONLY USED FOR HI-SPEED FAN USE. TRY HITTING THE MOTOR WHEN YOU GET IT NOT TO WORK AND IF IT STARTS THN YOU HAVE A BAD MOTOR.
#2) THE NOISE YOU HEAR WHEN TURNING THE IGN. ON AND OFF IS PROBABLY THE DEFROST DOOR CONTROLL ACTUATOR/MOTOR WICH HAS A POTENTIOMETER IN IT THAT TELLS IT WHEN TO STOP MOVING AS IT REACHES THE CORRECT POSITION. WHEN YOU TURN THE KEY OFF IT BY FEDERAL LAW HAS TO RETURN TO THE DEFROST POSITION IN CASE OF FAILURE. THE LITTLE SPLINES IN THE MOTOR OR ON THE SHAFT CAN GET STRIPPED WHEN THIS HAPPENS. TRY DUPLICATING THE NOISE BY SELECTING THE DEFROST ON AND OFF WITH THE KEY ON.
I WILL CHECK FOR YOUR FEEDBACK LATER
SOURCE: 2000 GMC Jimmy Transmission Whine
I recently took my vehicle to a transmission shop and they had to rebuilt the transmission right through. I was recently told that the transmission is a common problem in these vehicles. Sad that GM can not fix or recall the transmisison since there is a problem.
SOURCE: trying to install an aftermarket stereo 1994 GMC 1500
You have to unplug the old radio. The radio isn't the part in the dash. That is just the control to the radio. The radio is actually under the dash above the accelerator pedal. It should have the power wires, speaker wires and antenna wire going to it.
SOURCE: 1998 g.m.c. jimmy-turn signal flasher
I had same problem. You need to change the combo signal switch. I did find a sneeky way to do it without taking off steering wheel & air bag. There are two torx screws holing it on. The one in the front of switch is easy to get to. The other one toward the left under steering wheel is the pain. Get the proper torx bit, the bit should be about 1 in long. Put just the bit in the screw and use a quarter inch wrench to loosen it. This should save you about 1 hr & alot of work. Dont forget to remove battery cables first when working around the air bag (yellow wire)
SOURCE: Relay keep clicking under the glove box.
I had same problem. You need to replace combo signal switch, You can get it on line for about $150---DONT BUY FROM DEALER OR YOU WILL PAY $300
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