coolant loss

[dirtwarrior]

I lose coolant on my 2015 Mustang. It never gets hot even when I push it hard. Where do you think it is leaking?

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[NGOT8R]

Maybe at the water pump, Y-fitting or heater core lines. They all have o-rings inside that can begin to leak over time.

 

[Crew4991]

OP I agree with @NGOT8R that it might be your water pump.
When they start going bad, they don't leak consistently. They just leak, then they don't.. they will even pass a pressure test too. The earlier years (2015/2016) had that problem. I had it happen to me but luckily it was covered under warranty right before it expired a few years ago.
Pay attention to that water pump but if you find that isn't the issue, it will probably the the other areas that NGOT8R mentioned.

 

[ORRadtech]

Just to confirm, you have the V8? Or the V6 or Ecoboost?
How much coolant do you lose over what period of time?
I'm assuming that you have no obvious puddles where you park? Any coolant odor in the engine bay or white smoke and sweet smell in the exhaust?

 

[Skye]

Some tips on items to check...

- Coolant often leaves a residue behind, like limescale-looking deposits. Look for any traces of water/coolant which might have leaked and then dried

- Check the oil. If milky in color, you could have a internal engine leak. An oil analysis would confirm a leak and possibly the severity of it

- When the heater core is leaking, you'll smell the burnt antifreeze smell

- Pay attention to the exhaust, white smoke especially

- If you run any pressure testing, slowly do it when the engine is stone-ass cold

- Begin recording how much you're adding and when

- Remove the cabin filter. Look for any signs of moisture

- Remove the floor mats. Feel for any slickness, like coolant

- Inspect the radiator hoses for any signs of deposits and residue

- Using a mirror and a light, inspect the underside of the snout of the water pump for residue

- Look in the grill and radiator area, both faces of the radiator and side tanks, for residue

- Small leaks can sometimes be seen when the engine is cold; they then seal when hot

 

[dirtwarrior]

Oil is great, No puddles, Loss is slow but annoying. There is a dye that goes into the coolant, is this any good? I have the V6

 

[Decosse]

When the water pump in my 16 V6 went bad, there were no puddles, and the coolant level was dropping very slowly. I was aware of the water pump weakness from this forum and had kept an eye on it. The only sign I found was a damp spot on a metal bracket or the like right by the lower side of the water pump, IIRC. I'd photograph the spot, but I don't have the car anymore (3 months after replacing the water pump some lovely person drove into the passenger side front)

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