The car is a 1986 GT with a 1997 Regal 3800SC and 5spd Getrag. Interior heat hasn't been an issue in Texas until recently ... we got 3-4" of ice and temps into the high teens/low 20's. I know that's not much for you northern guys (I was a northern guy years ago), but no heater isn't fun in the winter. I've been crawling about the engine bay and under the car to trace the coolant lines and think that the original install is probably the issue. Looking for input and/or confirmation. I had a few drips from the heater core and just replaced that, but there was no coolant in the lines. I hijacked a couple of images from an archived thread (hope that's OK) and have posted them for reference. Great images ... I couldn't do better so reusing them. I previewed the images and they may not appear in my thread, but you can use the link I included to pull them up.
The pics are not of my car ... just for reference. I have a low mount alternator so the coolant flow out the alternator mount is not an option for me.
Here is the link to the original thread.
https://www.fiero.nl/forum/A...100421-2-092990.htmlA heater hose comes straight out of where the yellow #1 points to in this pic and pointed directly at the passenger side frame rail. It is then connected to a ninety degree bend and runs down to one of the coolant tubes that route up front to the heater core. There is no connection where the yellow #2 arrow points to the area below the supercharger. It just has a freeze plug in that port.
The other heater core tube has a hose that routes into the "T" connection at the rear of the coolant tube that runs to the radiator.

This is a better pic of where the freeze plug is installed in the yellow #2 connection. No flow from here.

From what Dennis LaGrua states in his reply to the original post the coolant flow comes from the yellow #2 intake manifold port, flows through the tubes and heater core and then returns to the yellow #1 location. Is my issue that the coolant flow is not directed by the water pump? If location #1 is a return point and the other coolant system location is in the passenger side coolant tube perhaps there is no way for the coolant to flow under pressure. Just a coolant system loop that has no flow?
Thanks in advance for any insight that you can provide.