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2015 Chevy (Holden) SS, 1989 Milano (Shankle Sport), 1991 164S
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Could be one of two items. First, the plastic tank ends of the heater core crack just like the car radiator end tanks, and start to leak or worse just blow out and spurt coolant everywhere. The plastic tank ends are the answer to a question nobody asked. Dumb idea. The PO might have just bypassed the heater to get rid of the leak.

Or... it could be that the PO bypassed the heater for summer, as older heaters in 164's send a lot of residual heat into the passenger area even with the controls set to cold. This is because of poor sealing around the core and ducting. You know that the heater has hot coolant running through it all the time regardless, and some install a shut off valve in one of the hoses coming into the engine bay to shut the flow to the heater off in the summer time. I've done this on my 91S and it makes a difference in the summer even in Seattle.
 
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