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Thread: 03 MARAUDER OVERHEATING

  1. #1
    Join Date
    Oct 2020
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    03 MARAUDER OVERHEATING

    Hey guys, cant seem to solve the issue with my 03 Marauder w/ 110k miles overheating. I changed the water pump, thermostat, and a coolant temp sensor (driver side). I also followed the recommend Burp Procedure. The fan blows, the hot and cold air work on the AC. Ive run out of ideas here guys. Any help would be greatly appreciated.

  2. #2
    Join Date
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    Make sure you got the right thermostat. A number of thermostats listed for the Marauder on a number of sites, say they also are for Marauder but are actually the wrong ones. They are for Grand Marquis, etc. which is not the same.
    2003 Mercury Marauder 300B (Daily Driver)
    1988 LTD Crown Victoria S

  3. #3
    Join Date
    Jan 2018
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    Also make sure the radiator is clean. Could be plugged with dirt, leaves, etc. No airflow means no cooling.
    2003 300a Trilogy #? 4.10s
    2000 Excursion limited v10
    1997 F350 7.3 5spd 4x4 (service truck)
    1992 Taurus SHO vortec SC 5spd
    1971 GMC 2500 pickup
    1971 GMC 2500 suburban 4x4
    1967 Camaro (basket case)

  4. #4
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    This is the thermostat I bought

    Is this the right one?

    Murray plus part number 4139
    Attached Images Attached Images

  5. #5
    Join Date
    Jun 2011
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    7,645
    Make sure the fan is coming on, and is it put in correct position? It can be put in upside down
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  6. #6
    Join Date
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    texas
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    The fan comes on. I will spray the radiator off when I get home from work. I just need to know if I put in the correct stat. I listed it above ^

  7. #7
    Join Date
    Mar 2007
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    Is the crossover tube full while the car is off and cold? Common problem is people don't fill the system enough and the COT is low which makes it overheat fast.


    2016 Ford Mustang GT PP - Lund nGauge, BMR vertical links

    2004 Mercury Marauder - Eaton M112, Billetflow 3.4, Accufab SBTB + Plenum, T-56 Magnum, 4.10s, Stainless Works LTs, 2.5" Exhaust, Borla Stingers, Ridetech Coilovers + Adj rear shocks, FX-R projectors, Wilwood 13" BNSL6 + FNSL4 BBKs, S55 Gauge Cluster
    440rwhp & 406rwtq Tuned by Adam @ Revolution Automotive

    (Sold) 2003 Mercury Marauder - Stainless Works LT's, Stainless Works 2.5" Catback, JLT Intake, Mo's Xcal4 Tune
    5377/7839

    2000 BMW M5 - Evolve Intake, Evolve Alpha-N tune, Stoptech ST-40 BBK, UUC SSK, Dinan front STB, Dinan RSB

    1996 Ford Bronco - 4" lift, 35" BFG A/T's, Punisher Valve Body, MH1 Projectors

  8. #8
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    Yes it is...I've searched the threads for every overheating issue and tried everything I could find to solve the issue. I'm now thinking it may be something with the radiator but that doesn't seem to be a common issue with Marauders.

  9. #9
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    Bad cap on the degaussing tank. I’ll almost guarantee that it tests bad, and if it does, the car will overheat.


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    When you are dead, you don’t know you are dead. It is difficult only for others. It is the same way when you are stupid.

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  10. #10
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    "degaussing tank"? Huh?

  11. #11
    Join Date
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    What part of Texas are you in

  12. #12
    Join Date
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    Fort Hood area

  13. #13
    Join Date
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    Quote Originally Posted by dbrown View Post
    "degaussing tank"? Huh?
    https://en.wikipedia.org/wiki/Degaussing

    WLB
    BB#1) 1996 ImpalaSS - 16,500 miles - 100% stock
    ______________________________ ___________

    BB#2) 2003 Marauder (300a) - 34k miles - Daily Driver
    #2912 of 7093
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    Ed "Baaad GN" Linthicum 8-6-2014

  14. #14
    Join Date
    Oct 2020
    Location
    texas
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    I spent $60 on ramps and burped it again with the front end elevated. Everything seemed ok, until I took it around the block and got on the gas...temp gauge rose almost to the red....IM THIS CLOSE TO BUYING A CHEVY!! Help me damnit.
    FYI I did notice that the temp held when i was stopped but slowly rose when i was on the gas.20201014_202821 (1).jpg

  15. #15
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    When it's over heating is coolant flowing in and out of the rad? Put on some gloves and squeeze the hoses.
    1/4 Mile Time 11.542 @ 121.19 MPH
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