How to replace freeze plug G20 van

Question edited for clarity.
Question moved to model category.

Newbie!! G20 radiator replacement - Chevy Message Forum

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Mar 10, 2015 - Resist the temptation to add anything to the radiator. Working on a van is challenging enough without having nuisances like this. Be patient as ...

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the heater control valve might be broken or plugged

Donald, You did not state the model, so I posted the link for the models I found for chevy van fuse box. Check the attached links,instruction and guides, Good luck
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My first thought would be a vacuum leak in one of the hoses. Rubber hoses get brittle with age and even a small crack in a hose may cause surging. Happened to me in a Lumina.

how do i remove the broken piece of arm rest from my 1999 full size chevy van . front drivers seat

1-8-4-3-6-5-7-2 The #1 spark plug is the front spark plug on the drivers side and the cylinder location in order from front to back on the drivers side is 1-3-5-7 and on the passenger side it is 2-4-6-8. The ignition rotor rotation is clockwise.

If your Distributor cap is not numbered then replace the new wires, or transfer the old ones to the new distributor cap one wire at a time. Identify the #1 spark plug wire and start from there.

1994 chevy 3/4 ton van, you have a 4L60E ?
You have to pull the trany pan, ther are 2 solenoids A and B. You will probably want to replace both, they are at the front on the valve block. www.rockauto.com

you may have a split hose inside the tank
had the same problem on a 94

Remove the engine cowling inside to access the ones in the rear. The front ones can be accessed from the front of the engine compartment. One or two of the middle row plugs can be accessed most easily by jacking up the vehicle and removing the front tires. Make sure you follow all safety procedures and use jack stands.

#1 cyl top dead center compression stroke, rotor pointining in a straight line between # 1 plug and front manifold bolt (front outer corner of valve cover driver side). Firing order 1-8-4-3-6-5-7-2 distibutor rotates clockwise