You really shouldn't use coil cleaner on a radiator. Unless the cleaner specifically says that this is one use you should use the proper cleaner.
4 coil
No, Drano is a drain cleaner and should not be used to flush a radiator. It is not designed for automotive use and can cause damage to the radiator system. It's best to use a radiator flush solution specifically designed for automotive cooling systems.
On the "frame" to the driver side of the radiator, under the air cleaner box.On the "frame" to the driver side of the radiator, under the air cleaner box.
The coil.
The drain plug is located on the driver side, bottom corner of the radiator, facing the engine. Use a pair of biscripts or plyers to GENTLY remove it. Here is a strange tip that works if you are flushing your radiator: Use Palmolive automatic dishwashing detergent instead of flush cleaner. It will neutralize more rust and leave your radiator cleaner. Just remember to run enough water though it that there are not any bubbles left in the radiator or flush water.
The coil packs are low on the engine block, behind the radiator fan.
In front of the radiator
A radiator
The coils can be cleaned using a coil brush and foaming coil cleaner. These items are available at www.appliancepartspros.com.
Take your car into a shop that does radiator flushes or buy a radiator flush kit from autozone or advanced auto stores you just need the cleaner and a hose
If you look through the grill on the front of the truck you will see it. It looks just like the radiator and it is bolted to the front of the radiator. It is about the same size as the radiator.
Locate the plug on the bottom of the radiator to drain it. Put some radiator cleaner in and drain it again.