What is your question?
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What is your question?
I don't plan to ever use the heater, do I have to replace that 3 way valve? What are the risks of damaging my electric or gas engine of my Prius?

1 Reply
No you don't have to replace...it just let coolant flow through heater core..
Thanks for your reply. I really appreciate your help. So the valve must be stuck closed right now and not allowing coolant to go to heater core. I haven't tried to turn on the heater since the CEL came on. I was thinking about changing the valve myself but then after reading some forums, it seems that the system needs to be well purged for air bubbles after the new valve is in place... I was thinking about getting 3 hose pinch off pliers to save me the trouble of purging after the job... but not certain if that's good enough. Do you think I still need to purge system if using the pinch off pliers?