[HWYSTR455]

I use anti-seize on the heater nipples to prevent stick/damage.

Why block it off? What's the intended goal? I can't see a good reason to do so, other than maybe reduce interior temps some. (which it really doesn't do by much)

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[TedRamAirII]

Water flows OUT of the head to the core and from the core TO the water pump. The larger hose is 3/4" . I think it helps cool at least the right side head to flow coolant through it to the core. Maybe to have both heads flow to the core would be even better? I would not do it with a stock type. engine though. Running the heater will in fact help a overheating engine cool. As was said, be careful not to damage the heater core pipes. treat them like they are glass, or you will be putting a core in. ; )

[Aaron65]

Originally Posted by HWYSTR455

I use anti-seize on the heater nipples to prevent stick/damage.

Why block it off? What's the intended goal? I can't see a good reason to do so, other than maybe reduce interior temps some. (which it really doesn't do by much)

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The car's been sitting around, and probably has the original heater core. I was just thinking of a way to shut off flow in case it were to rupture (that happened to me once!) or otherwise start leaking.

[HWYSTR455]

Just carry a hose reducer and put the two hoses together if it fails. You can just cut the hoses right at the core nipples at that point, or even pull to your' heart's content. (No worry of damaging the core at that point). Oh, and carry some spare antifreeze too.

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