1965 L76 Coolant change procedure

[Joe L.]

Re: 1965 L76 Coolant change procedure

Does the water pump on your heater-delete car (pretty cool feature by the way- pun intended) have a threaded port that can be used to attach the hose?

Mark------

The waterpump fitting on C-48 cars connects a hose to the external tank. However, a cap can be removed to connect a flush hose. A plug is used at the intake manifold fitting.

[Larry E.]

Re: 1965 L76 Coolant change procedure

I understand what you're saying. But how will you flush the system? Rinsing with a bunch of distilled water won't do much. Consider two things-

- Your method will leave a lot more crud in the system. Reverse flushing with a hose is gentle yet effective for systems with minimal rust (for neglected systems, a chemical flush may be needed).

- I'm using our home's tap water which goes through three filters. So although not distilled, the small amount that remains in the bottom of the block after draining the radiator is pretty clean. Even if using straight tap water, the overall system will be much cleaner than not flushing.

Does the water pump on your heater-delete car (pretty cool feature by the way- pun intended) have a threaded port that can be used to attach the hose?

Mark/Joe:Here is my preliminary report on N. Illinois Water. This area is primary old coal mines underground.
Don't know if this has anything to do with the water but >>

The Illinois EPA monitoring program shows average TDS of 452 mg/L. In Northern and Central Illinois streams, sulfate levels range from 30 to 150 ... So you can see that the average is rather high.

I will stick with the distilled water for flush that I get from my dehumidifiers that run 24/7 during the Summer.
How will I do this? Simply filling the system with distilled water; starting the engine (thermostat removed)then drain the system. Will
do this numerous times till the water runs out clear. NO IT IS NOT A PERFECT WAY BUT SEEMS TO BE A SIMPLE WAY.>>TIME WILL TELL>>LARRY

[Ralph E.]

Re: 1965 L76 Coolant change procedure

Just thinking about this post.
If the coolant is clear while draining from the radiator, why would removing the block drain plugs be necessary?
Another words, no crud is draining out. Wouldn't a regular coolant flush be sufficient?

[Mark E.]

Re: 1965 L76 Coolant change procedure

Just thinking about this post.
If the coolant is clear while draining from the radiator, why would removing the block drain plugs be necessary?
Another words, no crud is draining out. Wouldn't a regular coolant flush be sufficient?

That's right, flushing will remove more contaminates than draining alone.

[Mark E.]

Re: 1965 L76 Coolant change procedure

Mark/Joe:Here is my preliminary report on N. Illinois Water. This area is primary old coal mines underground.
Don't know if this has anything to do with the water but >>

The Illinois EPA monitoring program shows average TDS of 452 mg/L. In Northern and Central Illinois streams, sulfate levels range from 30 to 150 ... So you can see that the average is rather high.

I will stick with the distilled water for flush that I get from my dehumidifiers that run 24/7 during the Summer.
How will I do this? Simply filling the system with distilled water; starting the engine (thermostat removed)then drain the system. Will
do this numerous times till the water runs out clear. NO IT IS NOT A PERFECT WAY BUT SEEMS TO BE A SIMPLE WAY.>>TIME WILL TELL>>LARRY

Larry,

Not back flushing will leave many more contaminates the system than flushing and leaving in some city water.