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Re: How to replace the radiator drain petcock on a 89...
There common to break off, you can pick up the replacement drain plug at NAPA and buy a stud retracter to remove the drain plug. if the plug is not leaking, Leave it alone and to drain the radiator, just disconnect the lower radiator hose on the opposite side of the radiator.
Good luck and hope this helps you on your project.
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there isn't a proper drain plug for this type of radiator, nor is there a direct radiator cap either. fun, right? you can however go about using the lower raditor hose in the same fashion, removing the pressurized overflow bottle cap will greatly aid in drain time and prevent gulping and excessive splashing. it is a pain to get to without making a mess
Place a drain pan under the petcock.
Slowly turn the petcock CCW
Be careful to avoid contact with the flow if the car is hot
Open the petcock several turns until the flow is constant.
Remove the radiator cap to allow air into the radiator
once flow has stopped, close the petcock.
Look on the bottom of radiator by the bottom radiator hose it should be right next to it or around on the side of the tank at the bottom, it could be on either side of radiator left or right tanks, its just a little plastic tab you turn you might stand a better chance of finding it from under neath the truck, for myself i always found it easer to just pull the bottom radiator hose off to drain it, but it can get a little messey.
Well usually the center is setup for just the square end of a 1/4" rachet (used with a short extention). Look at the end and see it it has a small square hole in it. I'm not sure who told you to take the hose off, and I know you dont want to hear it, but that is great advise. GM petcocks are plastic inside and out. They get eaten up by the antifreeze as it ages and frequently break. Thats major trouble, depending on the break, it could mean a new radiator. The hose is messy, but the way to go. I will not allow the mechanics who work for me to open most plastic petcocks for this reason.
The drain **** is on the lower right
"backside" of the radiator. You can't get to this or the lower hose
without removing the plastic shroud under the radiator.
This has 5 bolts holding this on. Then reach around the back of the
radiator and you will feel a wingnut. You can loosen the drain knob
with pliers, but a small crescent wrench on bolt attached to wingnut
will prevent any stripping. The knob will only need a turn or less to
loosen,,,,then you can use your fingers to adjust flow.