2003 Nissan Altima 2.5 S
Hello, my heat works intermittently. Sometimes it works right away. Sometimes it takes quite a while. Sometimes it seems to not come on. The engine warms up to normal operating temperature, and stays there. When I give it some gas while in park, I can sometimes hear the fluid circulating, which I assume is the fluid going through the heater core. Sometimes I do not hear it. Is it safe to assume it may be a bad, or going bad, heater control valve? Any input would be appreciated. Thank you.