Basic advice

[Mr. J]

Ok, so clean with simple green then run the evaporust a couple of days and then remove the radiator again and back flush it and flush the block?

[Dollar Bill]

Originally Posted by Mr. J

Ok, so clean with simple green then run the evaporust a couple of days and then remove the radiator again and back flush it and flush the block?

I wouldn't go to the trouble of R&R the radiator at this point but it is a good idea to isolate and back flush the radiator and block separately.

You will need to fabricate a couple of adapters from test fittings. It's also extremely helpful to incorporate an air hose connection during the back flush. Macgyver your adapters as appropriate.

Adapter Fabrication


To back flush the radiator, remove the radiator hoses and connect the adapters to the upper and lower radiator nipples. Connect a garden hose (with air if possible) to the bottom nipple and run water though the radiator backwards to the normal flow.

For the block, install your garden hose adapter to the water outlet on top of the head - Again, use air blasts as it really loosens up a lot of sediment.