On Saturday, July 8, 2017 at 12:43:26 PM UTC-4, wrote:
On Sat, 8 Jul 2017 09:30:19 -0500, RonNNN wrote:

In article ,
says...

On Saturday, July 8, 2017 at 10:19:27 AM UTC-4, RonNNN wrote:
In article , says...

I don't see how any state inspection would spot a leaking heater
core,
unless it's pouring out. In warm weather, the coolant flow is off,
there would be no leaking.

Wrong.

--
RonNNN

So, you have hot water flowing through your heater core when it 80 outside and the car interior is set to 70? Must be a unique car.

There may not be flow, but there is pressure on the hoses and core, and
it *WILL* still leak.
There will be flow too, in MOST cars still on the road. The vast
majority do not control water flow through the heater core any more -
they just control air flow, either through or around. This is
particularly true of cars with "climate control" or automatic
temperature control / AC

This is shocking misinformation. Why in the world would any climate control or even manual AC be putting heat into the heater core unnecessarily while trying to cool the car? They're fighting for anything that can improve fuel economy and they have the heater core putting extra heat in the cabin? WTF? Why would they do that? And all it takes is to close a valve that's already there.