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need4speed255 · 02-21-2017, 11:09 PM

I bet your problem is inside the car. Whatever regulates the heat is going wacky. Whether it is a coolant flow valve on the heater core or a door that opens and closes. Not familiar with the Z hvac system but that is where you need to troubleshoot.

02-21-2017, 11:09 PM	#3 (permalink)
need4speed255 Enthusiast Member Join Date: Oct 2014 Location: Indiana Posts: 262 Drives: 15Nsmo/99 EclipseGST Rep Power: 11	I bet your problem is inside the car. Whatever regulates the heat is going wacky. Whether it is a coolant flow valve on the heater core or a door that opens and closes. Not familiar with the Z hvac system but that is where you need to troubleshoot.