hey guys, so i picked up my 1990 blazer 1500 (not REALLY a k5 but hey...) a couple days ago and im tearing into the interior. when i hit the rear hatch switch on the dash i can hear the motor but the glass wont go down. how can i get it go down or get the hatch to open??? so that i can open it up and figure out where the issue is. thanks a lot guys

 

is it the older style one where the window is supposed to go down. the newer ones swing open, if its the k5 style theres a access panel in the trunk. you just have to climb your butt back there with a screw driver and take off the 20 screws that hold it on then you can see everything. if its the newer one, probably the same thing thought its all plastic and might have a issue pulling it away

 

yea its the older one, i just posted that before i really looked at it and obviously figured it out myself, thanks though... any reason why my rear motor is working when the cable that turns the gears is off but the motor doesnt work when the cable is hooked up? is it just an old weak motor???

 

Yea most likely the motor is just wore out .

 

theres a way to see if the motors alright

you just need to test the voltage at the harness
like this
Diagnosing and replacing a power window motor

this is sorta for an other truck but testing the voltage is the same process

 

yea i figured i would break out the good ole' ohm meter next time i was wrenchin on her... just having gotten to it. just got some seafoam though so ill do that and flush the whole system then i got some pennzoil 5w20 (im in northern new england) high mileage oil to do an oil change. also have a really good quality wix filter. plan on purchasing some ngk spark plugs and 8mm wires soon also

 

ive seen those cables get all twisted up and not work. you can try disconnecting the cable off the motor then putting a pair of pliers on it and spin it, it should spin somewhat easy.

every k5 ive owned with a power rear window has been a pain in the butt.

 

oh ya me too man, chevy was all over the place building the rear's i put a drill on it and it goes, the cables fine, just a weak motor so im gonna have to buy that, just got the whole inside completely stripped though, everythings down the to metal so im gonna finished prepping it and patching the rust spots then hopefully bedline it sometime soon... hopefully i dont have to wait until summer