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Hi Phil,
The 240 heater valves are on the cabin side of the firewall, driver side, close to the firewall and mildly accessible for inspection with the console side panel removed. The OP said significant steam was coming from under the hood and the booster is getting coated. Also, increased fogging on the driver side windshield, so that is suggestive of a heater core failure or heater valve leak.
It could certainly be multiple problems. My attempt to explain that it could be from a single cause, like where the heater hose goes through the firewall. That could be a stress point as the engine vibrates and if a motor mount was gone could make it worse.
The heater core having been previously replaced leaves open the possibility it was a cheaper aftermarket and may or may not have been installed without nicking or pinching the hoses.
In my own experience the 240 heater valves are more prone to progressively fail providing less and less heat, eventualy perhaps leaking drips that might get to the carpet, but not a catastrophic failure like the later 700/900 series. A paper towel stuffed in around the heater valve would soon determine if it's involved.
BTW The 240 heater valves are the same as in the earlier 140 series. In the 140s, there was a calibration screw on the valve saddle and you could often extend the life of the heater valve through readjustment. The later 240 valves lacked that adjusting screw. Cable readjustment was possible in both styles. I've had both styles and don't recall ever having to replace them in the 16 years I had a 140 and 13 years I had a 240, nor do I recall much comment about it here on the brickboard. The OP's '79 may have either the later or earlier style and is way beyond the longevity I'm familiar with.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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