Rep Power: 0

When idling, my red temp lamp flashes on my 2014 Civic EX Coupe. If I ignore it, then the warning indicator on the display screen says High Water Temp. If I rev the engine, both will turn off, but back to idle, it will eventual warn me again. This tells me the water pump is bad, assuming some of the fins are damaged and not pumping enough at idle. Am I correct in my assumption or should I look for other issues? I certain it can't be thermostat. I haven't thoroughly checked anything yet so I know it could be the fans, but I think I hear them from inside. I'll check all later today, but due to how it reacts with revving, my first instinct is the pump.

Thanks for any input.

 
Rep Power: 512

I'd personally bleed the crap out of the coolant system first. If it ends up being the water pump, you're only out like $15 (if you have to buy a jug of coolant) and less than a half hour of time.

It very well could be the water pump, or it could be that revving the engine pushed actual coolant through instead of a giant air bubble.

 
Rep Power: 224

Check for blockages in the radiator fins. Are the radiator fans working?

 
Rep Power: 0

I believe you're correct or near to it. I didn't bleed the system but I did add antifreeze/coolant and after awhile the problem no longer exist. It did do once several days after it stopped but nothing of late. I know if it was the pump, it would do so all the time. If it returns more frequently, I'll bleed the system. Thanks

 
Rep Power: 512

Still might not be a bad idea to burp/bleed the coolant system, especially if you have at least a partial bottle of coolant handy. Park on an incline, pop the rad cap, start the car with the heater full blast. Let it come up to normal operating temps and top off as necessary. Rinse and repeat until you see no more bubbles, then let it run for another 5 or so minutes just to be sure. It'll take you maybe 10-15 minutes.

Regardless of the issue, I like to start with the easy/cheap (or free) fixes/tests before going with the harder/more expensive routes