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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, I really need some help fast please! in Past Cadillac Vehicle Discussion; Originally Posted by drewsdeville For future reference, that restrictor affects nothing as far as adding to or subtracting from the ...
  1. #16
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Quote Originally Posted by drewsdeville
    For future reference, that restrictor affects nothing as far as adding to or subtracting from the functionality of the heat in the HVAC system. It's there to control the process of electrolysis and to prevent heater core leaks. Replacing it with a restrictorless T will have no effect on the heater's temp output...
    That makes no sense. How would restricting flow reduce electrolysis? Why isn't this an issue in other vehicles with all time full flow heater cores?

  2. #17
    drewsdeville is offline Cadillac Owners Master
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    Re: I really need some help fast please!

    From what I have seen, most uninformed drivers replace with restrictorless - but I cant say whether or not it led to increased problems.

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    Re: I really need some help fast please!

    I don't know where you got that from, but the restrictor has nothing to do with electrolysis. It's there to slow the flow of hot coolant through the core so that heat can be extracted from it. Without it you WILL have trouble heating the cabin.

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    drewsdeville is offline Cadillac Owners Master
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    Re: I really need some help fast please!

    As long as the heater core is maintained at 200 degrees, the air flow through it will be heated...no matter how fast the flow of coolant. The only time it will have trouble heating is if the flow is so slow that the coolant isn't maintaining temp of the heater core - if flow is too low or heat transfer is too fast. If flow is too high or heat transfer is too slow, you'd get the opposite effect. If you turn on the hot water on in your kitchen sink, and in your bathtub, is the outlet pipe on your water heater any different if you shut one of them off? Of course not, the water flowing through it is the same temp - the pipe is the same temp. Ask Ford about the rest. Note step 6 of the procedure...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

  5. #20
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    Re: I really need some help fast please!

    I remember the Guru saying that no using a T with a restrictor will cause a lack of heat and I remember several people here proving that. I also seem to recall him mentioning the restrictor reducing flow to prevent erosion of the core, but the electrolysis prevention theory is laughable. How is a restrictor going to prevent that? I know you know better than that Drew.

  6. #21
    MoistCabbage's Avatar
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    Flow would not effect electrolysis at all.

  7. #22
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    Ford did have ground problems caused failed heater cores.
    Apples & oranges comparisons. Restrictor is there for a reason as it's a tuned system meant to flow a certain amount of AF/Coolant and allow maximum heat transfer. Anyone ever change a heater core and notice a step down or step up in piping? I've had aftermarket missing them and heat sucked after replacement.

  8. #23
    drewsdeville is offline Cadillac Owners Master
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    Re: I really need some help fast please!

    Quote Originally Posted by Ranger View Post
    I remember the Guru saying ....
    I was here with the "guru" and remember him all too well -the same character that also told us that excessive 4.x bearing clearance is caused by the serpentine belt tensioner . Micrometers never make mistakes. People do.

    Ask any plumber, not the mystery man on teh internets.

    A radiator and heater core perform the same function (transfer of heat energy), correct? Consider this then-

    If a restrictor helped heat transfer from the heater core, there'd be a massive restrictor for the radiator as well - since under your theory, the slower flow transfer is creating better heat transfer, increasing its efficiency. Strangely, we desire maximum rad flow and any restriction of the rad causes increased temps, even overheating, indicating a lack of heat transfer. Why's that?


    Using a similar example, if we considered the t-stat to be the radiator restrictor, under your theory, the system would run cooler if the t-stat remained closed and slowed flow within the radiator so that the radiator could cool the water better (better heat transfer). Strangely, the t- stat is designed to open and increase water flow when more heat transfer is required... go figure.

    In the end, I maintain that the restrictors purpose is to protect heater core health, especially from excessive pressure drop across the inlet and outlet, not to manipulate heater performance.

  9. #24
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    Re: I really need some help fast please!

    It's called a "heater control valve" for a reason and is there for a reason. I didn't design it or name it. All I know for sure is that if you omit it, you'll have heat, (not electrolysis) problems.

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