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#1753089 - 04/26/09 10:44 AM "rushing water" sound from under dash
dsanchez Offline
Rookie

Registered: 07/12/06
Posts: 59
Loc: Festus, MO
I used the search function and could not find anything on this. When I first start my car in the morning, I get the sound of "rushing water" that comes from under the dash. It also does it upon acceleration and on turns. The coolant level is good and I could find no leaks. Is this air in the system? I tried to "burp" it by squeezing the upper hose, nothing. What to do now? This is on a '97 CVPI.


Edited by dsanchez (04/26/09 10:44 AM)
_________________________
1997 CVPI

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#1753124 - 04/26/09 11:42 AM Re: "rushing water" sound from under dash [Re: dsanchez]
samgvr4 Offline
Member

Registered: 12/11/08
Posts: 114
Loc: Burke, VA USofA
sounds like its coming from your heater core, just a caution that it might be on its way out. Good luck

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#1753136 - 04/26/09 12:22 PM Re: "rushing water" sound from under dash [Re: samgvr4]
Lamp Offline
Member

Registered: 03/17/09
Posts: 119
Loc: KS
vacuum leak? does the car idle high, stall, or surge?
_________________________
2006 P71. All stock.

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#1753161 - 04/26/09 12:57 PM Re: "rushing water" sound from under dash [Re: Lamp]
kegobeer Offline
Climber

Registered: 03/11/09
Posts: 534
Loc: Panama City Beach, FL
When's the last time you had the air conditioning serviced?
_________________________


1999 Mercury Grand Marquis GS that has a few mods

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#1753233 - 04/26/09 02:44 PM Re: "rushing water" sound from under dash [Re: kegobeer]
Steve83 Offline
Poobah

Registered: 10/03/04
Posts: 7445
Loc: Memphis, TN 38002, USA, Earth,...
Updated TSB here

Note that, everywhere this TSB says "electrolysis", the correct term is "Galvanic action".
************************************************************
TSB 01-15-06 Repeat Heater Core Failure

Publication Date: JULY 26, 2001

FORD: 1985-94 TEMPO
1985-97 THUNDERBIRD
1985-2002 CROWN VICTORIA, ESCORT, MUSTANG
1986-2002 TAURUS
1988-93 FESTIVA
1993-97 PROBE
1994-97 ASPIRE
1995-2000 CONTOUR
2000-2002 ESCORT ZX2, FOCUS
2002 THUNDERBIRD
1985-90 BRONCO II
1985-96 BRONCO
1985-97 F-250 HD, F-350
1985-2002 ECONOLINE, F-150, RANGER
1986-97 AEROSTAR
1988-97 F SUPER DUTY
1991-2002 EXPLORER
1995-2002 WINDSTAR
1997-2002 EXPEDITION
1999-2002 SUPER DUTY F SERIES
2000-2002 EXCURSION
2001-2002 ESCAPE, EXPLORER SPORT TRAC, EXPLORER SPORT
LINCOLN: 1985-92 MARK VII
1985-2002 CONTINENTAL, TOWN CAR
1993-98 MARK VIII
2000-2002 LS
1998-2002 NAVIGATOR
MERCURY: 1985-94 TOPAZ
1985-97 COUGAR
1985-2002 GRAND MARQUIS
1986-2002 SABLE
1991-99 TRACER
1995-2000 MYSTIQUE
1999-2002 COUGAR
1993-2002 VILLAGER
1997-2001 MOUNTAINEER

ISSUE: Some vehicles may exhibit (repeat) heater core leaks. This may be caused by a chemical reaction called electrolysis. Electrolysis involves an ion exchange between the heater core and engine coolant which can result in a breakdown of the heater core material. This is similar to the operation of a battery.

ACTION: Check for electrolysis on any vehicle with a heater core failure. If electrolysis is verified, flush the coolant and follow additional steps as required. Refer to the following Service Procedure for details.

SERVICE PROCEDURE - Electrolysis Inspection:
If there is a condition of a heater core leaking or repeat heater core leak, check for electrolysis using the following procedure:

1. To check for electrolysis use a DVOM set on DC volts. Place the positive probe of the meter in the engine coolant and the negative probe on the negative battery post.
2. Adjust engine throttle to 2000 RPM to properly get coolant flow and true electrolysis voltages.
3. If more than .4V is recorded, flush the coolant and recheck (follow guidelines in TSB 98-23-16 for Cougar). See Coolant Fill Procedure below to remove trapped air on 4.6/5.4/6.8L modular engines.
NOTE: EXPORT MARKETS, BE SURE THE WATER IS DESALINATED.
4. If there is still excessive voltage present in the coolant, check the engine to body/battery grounds. Also, verify proper grounding of any aftermarket electrical/electronic equipment which has been installed into the vehicle. Improperly grounded electrical devices can cause electrolysis to occur.
5. If the condition is still present after the grounds have been checked, it may be necessary to add extra grounds to the heater core and engine. A hose clamp can be used to secure a 16 AWG stranded copper wire to the heater core inlet tube. The other end should be secured to an EXISTING FASTENER on the body
sheet metal. Extra grounds to the engine should be attached between EXISTING FASTENERS on the engine and body sheet metal. Verify continuity of any added grounds to the negative battery terminal.
6. If the condition is still present, add a restrictor (part F1UZ-18D406-A) on the inlet hose with the arrow facing the direction of coolant flow (toward heater core). Cut the line and install with 2 hose clamps. It is important that the restrictor be installed in the right direction of flow and as close to the engine block as possible (not near the heater core itself).

Coolant Fill Procedure
At times, in order to completely remove any trapped air in the cooling system of vehicles equipped with 4.6/5.4/6.8L modular engines, it may be necessary to use the following procedure:

1. Disconnect the heater hose at the right front or rear of the engine.
2. Remove the thermostat and housing.
3. Using the thermostat opening, carefully fill the engine with the proper clean coolant mixture until observed at the engine side heater hose connection.
4. Reconnect the heater hose and reinstall the thermostat and housing.
5. Fill the degas bottle to the coolant fill level mark.
6. Run the engine until it reaches normal operating temperatures.
7. Select max heat and max blower speed on the climate system.
NOTE: IF THE HEAT OUTPUT IS INSUFFICIENT, OR THE ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURES, VERIFY PROPER THERMOSTAT OPERATION AND REPEAT PROCEDURE IF REQUIRED.

PART NUMBER PART NAME
F1UZ-18D406-A Restrictor

OTHER APPLICABLE ARTICLES: 98-23-16
WARRANTY STATUS: INFORMATION ONLY
************************************************************

Note that, everywhere this TSB mentions "electrolysis", the correct term is "galvanic action". Electrolysis is the breakdown of the molecules in an electrolytic solution into their component chemicals due to an electrical charge being applied to the solution. (Hydrogen being emitted from a battery under a hard charge is an example of electrolysis since the water is breaking down into Hydrogen & Oxygen.) Luigi Galvani studied the interaction of electricity & metals exposed to an electrolytic solution. Since the phenomenon described in the TSB deals with the metal of the heater core & not the chemistry of the coolant, it's a galvanic process.


Edited by Liquid (04/30/09 07:54 PM)
_________________________
Walk softly & carry a BIG SIX ! ! !

. . .

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#1753235 - 04/26/09 02:51 PM Re: "rushing water" sound from under dash [Re: Steve83]
lpp71 Offline
Postimus Maximus
Over the Hill

Registered: 10/17/06
Posts: 3554
Loc: NW Indiana
Could be air, hows the coolant level if there is too much air in the system or its low it can make that noise.
_________________________

1999 Lincoln Town Car - 290k *** 1997 Lincoln Town Car - 95k
1998 Ford Crown Vic - 300k *** 2005 Mercury Sable - 160k

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#1753591 - 04/26/09 10:30 PM Re: "rushing water" sound from under dash [Re: lpp71]
tackleberry Offline
Poobah

Registered: 03/04/07
Posts: 7114
Loc: Las Vegas
what was changed in 03? seems like no heater core issues after 2002.


i notice similar noises in my car as well. but im also missing a firewall grommet so its noisy in my car from that direct area.
_________________________
ITS NOT A PANTHER, AND IT HAS A CABIN AIR FILTER!!!

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#1753630 - 04/26/09 11:41 PM Re: "rushing water" sound from under dash [Re: Lamp]
dsanchez Offline
Rookie

Registered: 07/12/06
Posts: 59
Loc: Festus, MO
No Vacuum leaks, idles fine, does not stall or surge.
_________________________
1997 CVPI

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#1753631 - 04/26/09 11:42 PM Re: "rushing water" sound from under dash [Re: kegobeer]
dsanchez Offline
Rookie

Registered: 07/12/06
Posts: 59
Loc: Festus, MO
A/C was serviced last year. Works great and blows cold.
_________________________
1997 CVPI

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#1753633 - 04/26/09 11:43 PM Re: "rushing water" sound from under dash [Re: tackleberry]
Crown Nick Offline
Over the Hill

Registered: 01/12/07
Posts: 3244
Loc: Houston, TX
Had this on my '98 once...for me it was air in the system.
_________________________


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#1753635 - 04/26/09 11:43 PM Re: "rushing water" sound from under dash [Re: lpp71]
dsanchez Offline
Rookie

Registered: 07/12/06
Posts: 59
Loc: Festus, MO
Coolant level is fine. Thinking it might be air. Might have to try the procedure listed on the TSB posted.
_________________________
1997 CVPI

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#1753656 - 04/27/09 12:23 AM Re: "rushing water" sound from under dash [Re: dsanchez]
dsanchez Offline
Rookie

Registered: 07/12/06
Posts: 59
Loc: Festus, MO
Is there a way to "pressurize" the cooling system to get the air out or do I need to do as the TSB states?
_________________________
1997 CVPI

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#1754011 - 04/27/09 01:29 PM Re: "rushing water" sound from under dash [Re: dsanchez]
Steve83 Offline
Poobah

Registered: 10/03/04
Posts: 7445
Loc: Memphis, TN 38002, USA, Earth,...
The cooling system naturally bleeds under normal operating conditions, ASSUMING you keep the coolant at the correct level in the degas bottle (reservoir). But following the procedure in the TSB will make it happen faster.
_________________________
Walk softly & carry a BIG SIX ! ! !

. . .

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#1754019 - 04/27/09 01:38 PM Re: "rushing water" sound from under dash [Re: Steve83]
mustang_zulu Offline
I am not
Over the Hill

Registered: 04/16/08
Posts: 1899
Loc: Garland, TX
i can hera that as well on my car. but only if like the radio is off and only on the first start of the day or if its been sitting for like 8 hours. usually only if i give her soem revs. and its very quite. the heater core can drain. so thats what im guessing what u hear. unless u hear it at normal operating temp as well??
_________________________

http://www.supermotors.net/vehicles/registry/19076
http://www.kiaboard.com/1998CVHPP/phpslideshow.php
1998 CVHPP P74, 130k Orginal Miles, Flow Master Delta 40's/ CAI/ P71 PCM, P&P Inc. plenum & 75mm TB/ PI Intake & Cams/ 24 lb Injectors/ Steeda UD's

Vortech S/C Vic under construction **stay tuned**

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#1754436 - 04/27/09 11:18 PM Re: "rushing water" sound from under dash [Re: mustang_zulu]
mrbear5300 Offline
professional grade
Poobah

Registered: 12/29/05
Posts: 5059
Loc: BUF
I've had the "waterfall" sound in the dash for up to a week after filling it and purging the air to the best of my abilities. Sometimes I just think air gets trapped in there and only time will remove it.
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