- Joined
- Nov 29, 2009
- Messages
- 7,293
Anyone ever install one of these? My 99 dodge cummins takes coolant from the cylinder head, goes through the heater core and then returns it to the water pump according to a youtube video I watched. AFAIK it circulates coolant all the time whether you're using the heater or not, but my question is if you close this valve is the water pump still pumping coolant? Aren't you cutting off flow to the water pump? I would think that gives it a little bit of help cooling the engine in the summer, because it flowing through the heater core is like a mini radiator Opinions? I don't get how these valves make the ac colder, is it just cutting the hot heater core out of the system making it cooler inside the dash?