turn 1/4 counter clockwise= fromright to left. use pliers, very difficult to grasp-no room. petcock will turn and pop out enough to let water flow.
twist-n-pull seems to be all the rage in detroit. simple, but effective....read--CHEAP
Follow the upper radiator hose from the radiator to the engine. Where the hose is attached at the engine is the thermostat housing. Drain some coolant from the radiator thru the petcock, remove upper radiator hose from thermostat housing, remove thermostat housing then remove the thermostat. On the Express van you will probably need to remove the air filter assembly to gain room to work.
Look at the bottom or rear of radiator ------------------ Actually, you just remove the grill (something like 8-10 screws on the front of it), then there is a small plastic petcock on the passenger SIDE of the radiator, at the bottom. Turn it a quarter turn and antifreeze will begin to trickle. If you want to drain the system completely (meaning the engine block too), on the driver's side fo the engine block itself there is a drain plug. It's below the manifolds and more serious work involved to get to it.
If you have coolant exchanger take radiator cap off drain as much as you can along with reservoir. Remove upper hose clamps take hose off drain any excess then lower hose from radiator drain that. Otherwise Drain plug at bottom of radiator and a "oil pan" which can be used (if clean) for coolant. Should work well enough then remove hoses and other lines. If you are replacing radiator and doing this in driveway expect an hour or two if you are just starting out with stuff like this.
First, decide if you need a flush and clean or just to replace the anti-freeze with new fluid. You could decide this by looking into the radiator. If you see excessive build up on the internal parts of the radiator you will want to flush with a commercial radiator cleaning solution that will break down the gunk in the radiator allowing for better flow and cooling of the engine.If you need to flush it, follow the directions on the label. Once that is completed you want to drain the system. Do this by placing a catch pan beneath the radiator under the petcock valve. On your vehicle it is located on the bottom, drivers side part of the radiator. It will be facing the engine. Remove your radiator cap to allow the system to breath while draining. Once the flow stops from the petcock valve you can tighten it back up and refill the radiator with a proper blend of anti-freeze and water (follow instruction on anti-freeze bottle)Some mechanics will fill and flush an engine again before final fill with antifreeze, especially if significant build up is present in the radiator. Also, if it easily accessible, the lower radiator hose can be removed to help speed up the draining of the engine. Some people believe loosening the upper hose helps better drain the block but removing the radiator cap will suffice and leaves less to work on in order to get back up and running.
The radiator drain plug is located on the back left side of the radiator (facing the engine) approximately 4" above the chassis rail that runs underneath the radiator. It's usually a plastic plug that is mounted on the back side (rather than underneath) the radiator and is apparently not meant to completely unscrew out of the radiator. It's quite difficult to get to without a lift as you have to reach up and over a few things to get to it. You may need a small pair of plyers to work it loose.
Should be drain plug on engine side of radiator down towards the passenger side. Drain fluid and dispose of properly. There is no easy way, remove hoses connected to the radiator at the radiator and electrical fan housing this should have a wire connecting plug. You will not have to take off the front of the car. just work your way from the hoses to the radiator. If you feel that you will have problem remembering where things go use masking tape and marker to label. Example take two pieces of tape and write # 1 on each place one on the item your removing and the other on the spot where you removed it from.
This should be on the bottom of one of the two end tanks on the engine side of the tank. There are many different designs of plugs, some of the newer styles are VERY different than the older brass, use a pair of regular pliers on them, drain cock. They still work the same, just twist it and it should drain.
just drain and refill, unless its dark and rusty, then follow directions on the can of flush.. drain is on bottom of radiator also Everyone should have a manual for their vehicle, and the local library should have a professional shop manual available to make copies of for FREE...make the time to take time to read up on your vehicle, and work like the PRO'S! Good luck :) Dave
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