What are the best Toyota repair shops?
RepairPal Certified shops can diagnose and repair your 2005 Toyota Prius. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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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?