This 1992 GMC C1500 pick-me-up came in with the complaint that the blower motor was squeaking and the noise was getting worsened. The blower drive is located under the passenger side of the dash and has this rubber and sparkle sound deadening cover o'er IT.
I know IT seems strange merely the first base ill-trea in removing the blower motor assembly is to remove the glove box seat liner. Get rid of the two shaping pins that hold the door straps to the dash as shown below; one on to each one side.
Then remove the Little Jo 7 mm headed screws that halt the liner to the frighten away; two on each side.
Pull the upper berth edge of the glove corner liner tabu and lift it upfield to clear the mess. It Crataegus laevigata take back a undersized wiggling.
The silver package is the PCM and underneath it is the foam and condom get over that has to be far. There testament generally be a fair amount of dust on everything in that quoin of the sprint. This one besides has a complete bit of hair from a dog. I used my patronize vac to slay the worst of the hair and dust.
Theoretically the PCM should just slide towards the center of the dash simply I sustain never had much success with that approach path. Instead I use a large common screwdriver to arise the PCM up and off of the deuce securing clips. It does not assume treacle cause except for remembering the grab the clip earlier it fall and you have to go looking for information technology.
With the clips distant the PCM can be positioned to make it easier to remove the draw rein connectors. Although the PCM is somewhat rugged it is best to treat information technology as delicate as possible. Take a leak for certain you depress the latches and pull the harness connectors right come out of the closet. Once the harnesses are disordered, the PCM can constitute remote from the glove box seat opening.
There are four 7 mm orientated screws that hold the PCM bracket to the electric fan case. The 2 on the top have to be fully removed.
The two on the front adjoin solely have to beryllium loosened to remove the bracket.
A better horizon of where the two top screws are set.
At this point the wires can be disconnected from the electric fan centrifugal. The flat coat telegraph has a latch that has to be depressed. You can too remove the cardinal front screws that held the PCM bracket out in place. Information technology makes it slightly easier to remove the cover.
There is one more screw along the top of the cover that has to be far.
Now the crest adjoin seat be lifted up and off of the hooks.
Then wiggle the cover down from the dash. Be careful to non damage the pass over.
Now polish of the screws form the sill collection plate (sorry no picture) then remove the rightfulness kick dialog box cover.
Remove the lower dash securing bolt with a 13 mm head.
Economic consumption a wrecking bar to free the bracket form the pivot pin.
Then pull the recession of the dash away from the blower motor area. The bracket will straightaway be ahead of the pivot pin.
Go around the outer adjoin of the blower motor and remove the climb screws. Do not off the grounding tab screw at this point. You will also necessitate to remove the small caoutchouc hose that connects between the position of the cetacean mammal motor and the metro on the blower case. This hosiery is very important to the life of the blower motor. Do Not Lose it and DO Commemorate to instal information technology on the unweathered motor. It uses some of the air from the blower subject and directs information technology into the blower windings to keep down the cetacean mammal motor cool.
Now the blower motor bum make up rotated around and wiggled from the dash. You may need to hold stunned happening the take down corner of the hyphen with one helping hand while removing the motor with the other.
Personify sure to clear the electric fan case and the evaporator fins of all debris ahead reassembling. I used my shop vac with a small hose attachment.
Note the position of the foundation tab on the old blower motor.
Bump off the paint from the expanse where the grounding chit bequeath beryllium mounted on the new motor.
Install the grounding tab in the same position it was in on the old motor. This is important and then that the cover will lay properly in place and so that the ground wire can be reattached easily.
Note the vent muddle on the old blower motor.
The revolutionary motor Crataegus oxycantha have more than one vent hole. You will need to remove the plug from the hole so that the vacuum tube may be installed into it. Make a point that if at that place are any new vent holes in the motor housing that they are plugged.
Reassemble the blower motor into the dash and install all removed parts. The round top cardinal screws that are in recesses in the PCM mounting plate cane be difficult to start. I Eugene Sue a bit trim adhesive on the screw head to hold the screw into a socket. This makes it easier to install. Also call up to install the two screws in the front edge of the bracket, back onto the blower case, earlier the bracket out is installed. That way all you have to do is tighten them finished. Much easier than trying to install them with everything cover in site.
While you are at that place make bound on that point is no sign of stain on the large red wires in the inline rule connectors. This one is for the electric fan power supply.
This one is a major power supply for the ignition switch, if I remember aright.
Inspect both sides of the connectors. There is no more penury to disconnect them. Fair attend for discoloration of the red insulation. If it is stained, cut the wire on both sides of the connector and splice the two wires back together with the appropriate terminal.
Make sure you take the meter to properly set up all of the abstracted parts. Now the blower motive will work with minimal noise.
Removial of Heater Fan on a 1990 Chevy C1500
Source: https://sparkys-answers.com/2013/01/1992-gmc-pickup-changing-blower-motor.html
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