Sloshing noises when defrost is on high - Ford Mustang Forum
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post #1 of 9 (permalink) Old 11-12-2018 Thread Starter
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Sloshing noises when defrost is on high

so i was driving home today and it was pouring down rain and 40 degrees F outside. I turn the defrost on to high and while driving through the parking lot, it sounds like there is no separation between me and the outside world. In the passenger footwell, and only the passenger side, with the defrost on high (only when its on high) I can hear all the puddles i go over and all the water outside. When i got home i parked in a covered area so no rain was hitting me and left the car running and stuck my head in the footwell and still hear the watery/slosh noise.

Anyone experience something similar? It might have to do with the way the air hoses are because I don't really have air blowing on my feet when i select air to be blown in the footwells

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post #2 of 9 (permalink) Old 11-12-2018
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If you're hearing the noise when the car is running but not moving, you probably have an air bubble in your cooling system and the gurgle is coming from the bubbles passing through your heater core.

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post #3 of 9 (permalink) Old 11-16-2018 Thread Starter
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Originally Posted by Travis98146 View Post
If you're hearing the noise when the car is running but not moving, you probably have an air bubble in your cooling system and the gurgle is coming from the bubbles passing through your heater core.
So when its on but not moving I head a drip noise and a noise like water is hitting a hot surface (think when you're grilling and you spit on the lid and the spit evaporates, that noise)
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post #4 of 9 (permalink) Old 11-16-2018
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Sounds to me like the drain is plugged for the evaporator housing.
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post #5 of 9 (permalink) Old 11-16-2018
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+1 on the plugged drain line water can accumulate in the heater/defroster housing

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post #6 of 9 (permalink) Old 11-16-2018 Thread Starter
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Originally Posted by Mac The Knife View Post
Sounds to me like the drain is plugged for the evaporator housing.
Turns out the problem (May not be all of it but i suspect most of it) was the front cowl drain plug was clogged. Just like on most s197s I took the piece between the hood and the windshield off and boo, full of water. So i cleaned that out well. I suspect the noise i heard was a drip going on the A/C pipes that are right under the plug so when i turned the water went over the plug and forced a couple drips out onto the hot pipes and that was the steam noise i heard. Making a video on it so check it out on my youtube www.youtube.com/c/Mototaco
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post #7 of 9 (permalink) Old 11-16-2018 Thread Starter
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Originally Posted by baylensmanfl View Post
+1 on the plugged drain line water can accumulate in the heater/defroster housing
I believe the problem was the drain plug in front of the windshield. I cleaned it out and all the water drained (a couple inches) so hopefully that was it
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post #8 of 9 (permalink) Old 11-19-2018 Thread Starter
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Originally Posted by Mac The Knife View Post
Sounds to me like the drain is plugged for the evaporator housing.
Ok this might be it. I cleared the drain plug from the front cowl but today as i started my car and began to back my car up i heard some bubbles/liquid move around. I park at a slight down angle and the car was cold, about 40 out, and i had my defrost on but not all the way. How would i go about checking the evaporator housing/ where is it located?
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post #9 of 9 (permalink) Old 11-19-2018 Thread Starter
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Originally Posted by Travis98146 View Post
If you're hearing the noise when the car is running but not moving, you probably have an air bubble in your cooling system and the gurgle is coming from the bubbles passing through your heater core.
So i took care of a lot of the problem but no all of it. How do i go about checking this? Is it just like getting air bubbles out the cooling system where you leave the radiator cap off and run the car or is it different?
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