I have a 2012 Patriot and just suddenly the heater stopped getting warm, there is plenty of coolant. any ideas?
x2possible t/stat went bad.....
Yes! I've witnessed this in a friend's S-10. they had to replace the heater core as it was too jammed up to clean--about $300!All of the above suggestions are possible, but is it possible you put the wrong coolant in? You can't mix red and green coolants. If you add green coolant to red it will gel and clog the heater core, I speak from experience, it happened on my Dodge Ram, and a buddies S-10. The temp gauge will show the right temp, but you'll blow cold air from the vents.