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Radiators usually have a valve/petcock located on the engine side of the radiator down at the bottom. Valve turns like a bolt and antifreeze coolant will drain out into your drainpan. Use care as coolant is poison and needs to be disposed of properly. After radiator has drained, retighten petcock and fill to the appropriate level.
You don't. You never open the petcock on radiators with plastic tanks because the petcock always breaks. If it doesn't break, it'll leak when you close it. No pro ever uses the petcock. You loosen the lower radiator hose clamp and yank the lower radiator hose. You'll take a bath, but it'll all be drained in about 1.5 mins. Then reconnect. You'll actually drain far more coolant that way too.
THE RADIATOR DRAIN TAP "PETCOCK" FOR THE 94 JEEP CHEROKEE IS ON THE PASSENGER SIDE AT THE BOTTOM OF THE RADIATOR - THOUGH TO BE BRUTALLY HONEST YOU WOULD BE BETTER JUST REMOVING THE BOTTOM HOSE TO DRAIN THE RADIATOR AS THE TAP/PETCOCK HAS A TENDENCY TO SNAP IN THESE OLDER MODEL JEEPS - IT DID WITH MY 96 JGC & IT COST ME A NEW RADIATOR TO THEN "FIX" THE PROBLEM.
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.
Should be a drain plug or petcock at the bottom or rear of the radiator or remove the lower radiator hose. If there is a petcock just/drain plug. Generally on this year you would rotate it 1/4 turn and it will start draining. If it doesnt drain there is something inside the radiator. Then you will have to resort to removing the lower radiator hose. If you need further assistance please let me know. Thanks, Midwest-tek
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.
Most are difficult to get to and so many don't work correctly that it it's almost silly to even use it. Far easier is to simply remove lower hose from radiator. It works better and faster. Just be careful though...Don't do hot or you may get an unwanted scalding bath!!
Cooling System Ensure that the engine is completely cool prior to starting this service.
1. Remove the recovery tank or radiator cap.
2. Raise and support the vehicle.
3. Place a drain pan of sufficient capacity under the radiator and open the petcock (drain) on the radiator.
èPlastic petcocks easily bind. Before opening a plastic radiator petcock, spray it with some penetrating lubricant.
4. Drain the cooling system completely.
5. Close the petcock.
6. Remove the drain pan.
7. Lower the vehicle.
8. Determine the capacity of the cooling system, then property refill the system with a 50/50 mixture of fresh coolant and distilled water.
9. Leave the recovery tank or radiator cap off to aid in bleeding the system.
10. Start the engine and allow it to idle until the thermostat opens (the upper radiator hose will become hot). The coolant level should go down, this is normal as the system bleeds the air pockets out of the system.
11. Refill the system with coolant to the proper level.
12. Turn the engineOFFand check for leaks.