Gurgling behind dash
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Elder User
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From: Independence
Gurgling behind dash
Hey guys got a question, I have a darn gurgling noise behind the dash! Now I have read different things on this, it has been doing this for awhile, like as in about 4 months or more. Any way i've read head gasket, air in the system and heater core! Now I did have a t-stat problem. But I fixed that, it was about a week ago. But the noise was there before that! It doesn't overheat and the heat works good! Also I see no water in the oil or anything. By the way it is a 97 F150 4.6 extended cab. It runs fine it's just when I step on the gas it does this. It has me baffled right now, any ideas would be greatly appreciated! Thanks guys!
Fleet Mechanic
Joined: Aug 2008
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From: NE Iowa JD Country
Hey guys got a question, I have a darn gurgling noise behind the dash! Now I have read different things on this, it has been doing this for awhile, like as in about 4 months or more. Any way i've read head gasket, air in the system and heater core! Now I did have a t-stat problem. But I fixed that, it was about a week ago. But the noise was there before that! It doesn't overheat and the heat works good! Also I see no water in the oil or anything. By the way it is a 97 F150 4.6 extended cab. It runs fine it's just when I step on the gas it does this. It has me baffled right now, any ideas would be greatly appreciated! Thanks guys!
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Elder User
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From: Independence
You think this even though it's been doing it several months? Just asking? I hear it when accelerating and sometimes when I first start it maybe it is the heater core? I would rather it be that, then the head gasket! Even though both are quite a pain! I mean it's quite annoying! I've heard others say they have drove theirs for years without a problem? I guess it's possible? Thanks for the advice! Oh I did do a pressure test a month or so ago and the psi was fine, then I released the pressure with gauge still on there and let it run it didn't build pressure in the expansion tank imeadiatly saw a video how to do that. But didn't do the other where the fluid changes color though! Thanks again!
Fleet Mechanic
Joined: Aug 2008
Posts: 1,446
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From: NE Iowa JD Country
You think this even though it's been doing it several months? Just asking? I hear it when accelerating and sometimes when I first start it maybe it is the heater core? I would rather it be that, then the head gasket! Even though both are quite a pain! I mean it's quite annoying! I've heard others say they have drove theirs for years without a problem? I guess it's possible? Thanks for the advice! Oh I did do a pressure test a month or so ago and the psi was fine, then I released the pressure with gauge still on there and let it run it didn't build pressure in the expansion tank imeadiatly saw a video how to do that. But didn't do the other where the fluid changes color though! Thanks again!
Agreed ...in either case there is a lot of work involved.
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Elder User
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From: Independence
Yeah sorry forgot the name of the test even though you had said it, lol hydrocarbon test I mean. I might try to do a direct heater core flush first just to see what happens? If I get a day if it gets a tad warmer it's cold here in Missouri I don't want frozen water out of my garden hose lol! Or on the ground! Don't know where you are? But it's probably cold in your neck of the woods? Unless maybe your in Hawaii, thanks again for the advice I just pray it's not a head gasket for sure!
Lead Driver
Joined: Sep 2006
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There is air in the system and coolant may be low.
A slow leak may have developed.
Have you looked?
If the system is tight, there will be a vacuum on the cap when removed 'cold'.
If not there is a leak some place.
Good luck.
A slow leak may have developed.
Have you looked?
If the system is tight, there will be a vacuum on the cap when removed 'cold'.
If not there is a leak some place.
Good luck.
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Elder User
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From: Independence
No low coolant low and there Has always been a vacuum sound when cap is removed and yes I've looked for leaks haven't seen any. And I have tried to burp the system several times, and still here the noise. Even with it on ramps and on a incline with the cap off and the heater on high. I also did a pressure test and it held 16 psi for at least 15 minutes. Thanks for the help!
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Lead Driver
Joined: Sep 2006
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Only way that sound is produced is air in the heater core with coolant being force by it.
The faster the motor runs the more you will hear it.
Good luck.
The faster the motor runs the more you will hear it.
Good luck.
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Elder User
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From: Independence
Figured, it seems to go away after the first initial push of the accelerator pedal. Thanks again! Like I said everything seems to be fine per say that gurgling is annoying for sure!
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Elder User
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From: Independence
Does anyone know what the hard plastic thing is in the heater core inlet hose, is that the flow restrictor? And could that be bad or clogged? Thanks!
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From: Independence
Also what if it is removed heard different stories about it? And any idea what you should do if you can't but another or whatever, i've heard folks say it's an obsolete part? I'm just speaking if I had to replace the heater core etc. Thanks!
Fleet Mechanic
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It is inside the inlet hose itself, away from an end, and held there with an external clamp, besides it's pressure exerted on the hose wall due to it's outer diameter being bigger than the hose's ID. A quality proper replacement hose will have the restrictor already in it. No reason to ever fool with it.
I believe the inlet hose restrictors were first used when the 4.6L modular engines appeared in the Crown Vic/MGM/Town Cars years before the 1997 F-150.
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Elder User
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From: Independence
Yes it is. If you have decent heat when the engine is well warmed up, the restrictor is fine.
It is inside the inlet hose itself, away from an end, and held there with an external clamp, besides it's pressure exerted on the hose wall due to it's outer diameter being bigger than the hose's ID. A quality proper replacement hose will have the restrictor already in it. No reason to ever fool with it.
I believe the inlet hose restrictors were first used when the 4.6L modular engines appeared in the Crown Vic/MGM/Town Cars years before the 1997 F-150.
It is inside the inlet hose itself, away from an end, and held there with an external clamp, besides it's pressure exerted on the hose wall due to it's outer diameter being bigger than the hose's ID. A quality proper replacement hose will have the restrictor already in it. No reason to ever fool with it.
I believe the inlet hose restrictors were first used when the 4.6L modular engines appeared in the Crown Vic/MGM/Town Cars years before the 1997 F-150.
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